DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [08/2016 - 11/2017]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Network Gateway ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   O46-13 (CA2H) - O46-12 (CA2L)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
   			70 Ω or higher: Open circuit in main bus lines
   O46-13 (CA2H) - O46-4 (GND)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
   O46-12 (CA2L) - O46-4 (GND)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O46-13 (CA2H) - O46-2 (BATT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   O46-12 (CA2L) - O46-2 (BATT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   Result

   Result	Proceed to
   OK	A
   Open circuit in CAN main bus lines	B
   Short circuit between bus lines	C
   Short to ground +B short	D

Result: 

B 

See step  3

Result: 

C 

See step  9

Result: 

D 

See step  16

Result: 

A 

See step  2

1. Reconnect the cable to the negative (-) battery terminal.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Clear the DTCs.

   Body Electrical > Gateway > Clear DTCs 

6. Turn the engine switch off.
7. Turn the engine switch on (IG).
8. Check for DTCs.

   Body Electrical > Gateway > Trouble Codes 

   Result

   Result	Proceed to
   DTC U1002 is not output from the network gateway ECU (Techstream display: Gateway)	A
   DTC U1002 is output from the network gateway ECU (Techstream display: Gateway)	B

Result: 

A 

SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 11/2017] 

Result: 

B 

REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [09/2014 - 11/2017] 

1. Disconnect the O46 network gateway ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Network Gateway ECU)

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O46-13 (CA2H) - O46-12 (CA2L)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [09/2014 - 11/2017] 

Result: 

NG 

See step  4

1. Reconnect the O46 network gateway ECU connector.
2. Disconnect the O102 No. 2 CAN junction terminal connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 2 CAN Junction Terminal)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O102-3 (CANH) - O102-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NO. 2 CAN JUNCTION TERMINAL 

Result: 

NG 

See step  5

1. Reconnect the O102 No. 2 CAN junction terminal connector.
2. Disconnect the O108 No. 4 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 4 CAN Junction Connector)
   *b	to Network Gateway ECU
   *c	to No. 3 CAN Junction Connector

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   O108-2 (CANH) - O108-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Network gateway ECU
   O108-3 (CANH) - O108-14 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 3 CAN junction connector

   Result

   Result	Proceed to
   OK	A
   NG (Network gateway ECU main lines)	B
   NG (No. 3 CAN junction connector main lines)	C

Result: 

A 

REPLACE NO. 4 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 4 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  6

1. Reconnect the O108 No. 4 CAN junction connector.
2. Disconnect the O106 No. 3 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 3 CAN Junction Connector)
   *b	to No. 4 CAN Junction Connector
   *c	to No. 9 CAN Junction Connector

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   O106-7 (CANH) - O106-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 4 CAN junction connector
   O106-8 (CANH) - O106-19 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 9 CAN junction connector

   Result

   Result	Proceed to
   OK	A
   NG (No. 4 CAN junction connector main lines)	B
   NG (No. 9 CAN junction connector main lines)	C

Result: 

A 

REPLACE NO. 3 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  7

1. Reconnect the O106 No. 3 CAN junction connector.
2. Disconnect the W13 No. 9 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 9 CAN Junction Connector)
   *b	to No. 3 CAN Junction Connector
   *c	to No. 7 CAN Junction Connector

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   W13-1 (CANH) - W13-7 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 3 CAN junction connector
   W13-2 (CANH) - W13-8 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 7 CAN junction connector

   Result

   Result	Proceed to
   OK	A
   NG (No. 3 CAN junction connector main lines)	B
   NG (No. 7 CAN junction connector main lines)	C

Result: 

A 

REPLACE NO. 9 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  8

1. Reconnect the W13 No. 9 CAN junction connector.
2. Disconnect the U53 No. 7 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 7 CAN Junction Connector)
   *b	to No. 9 CAN Junction Connector
   *c	to No. 2 CAN Junction Terminal

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   U53-1 (CANH) - U53-12 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 9 CAN junction connector
   U53-2 (CANH) - U53-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 2 CAN junction terminal

   Result

   Result	Proceed to
   OK	A
   NG (No. 9 CAN junction connector main lines)	B
   NG (No. 2 CAN junction terminal main lines)	C

Result: 

A 

REPLACE NO. 7 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR) 

Result: 

C 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL) 

1. Disconnect the O46 network gateway ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Network Gateway ECU)

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O46-13 (CA2H) - O46-12 (CA2L)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [09/2014 - 11/2017] 

Result: 

NG 

See step  10

1. Reconnect the O46 network gateway ECU connector.
2. Disconnect the O102 No. 2 CAN junction terminal connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 2 CAN Junction Terminal)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O102-3 (CANH) - O102-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NO. 2 CAN JUNCTION TERMINAL 

Result: 

NG 

See step  11

1. Reconnect the O102 No. 2 CAN junction terminal connector.
2. Disconnect the O108 No. 4 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 4 CAN Junction Connector)
   *b	to Clearance Warning ECU Assembly (w/ Intuitive Parking Assist System)
   *c	to Network Gateway ECU
   *d	to No. 3 CAN Junction Connector
   *e	to Option Connector (Bus Buffer ECU)
   *f	to Telematics Transceiver (for Lexus Enform Remote Compatible Type)
   *g	to Absorber Control ECU

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   O108-1 (CANH) - O108-12 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Clearance warning ECU assembly*1
   O108-2 (CANH) - O108-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Network gateway ECU
   O108-3 (CANH) - O108-14 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 3 CAN junction connector
   O108-4 (CANH) - O108-15 (CANL)	Cable disconnected from negative (-) battery terminal	1 MΩ or higher	Option connector (bus buffer ECU)
   O108-5 (CANH) - O108-16 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Telematics transceiver*2
   O108-6 (CANH) - O108-17 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Absorber control ECU

   1. *1: w/ Intuitive Parking Assist System
   2. *2: for Lexus Enform Remote Compatible Type

   Result

   Result	Proceed to
   OK	A
   NG (Network gateway ECU main lines)	B
   NG (ECU or sensor branch lines)	C
   NG (No. 3 CAN junction connector main lines)	D

Result: 

A 

REPLACE NO. 4 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 4 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  15

Result: 

D 

See step  12

1. Reconnect the O108 No. 4 CAN junction connector.
2. Disconnect the O106 No. 3 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 3 CAN Junction Connector)
   *b	to No. 4 CAN Junction Connector
   *c	to No. 9 CAN Junction Connector
   *d	to Driving Support ECU Assembly (w/ Pre-collision System)
   *e	to Headlight Leveling ECU Assembly (for Single Beam Headlight)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   O106-7 (CANH) - O106-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 4 CAN junction connector
   O106-8 (CANH) - O106-19 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 9 CAN junction connector
   O106-10 (CANH) - O106-21 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Driving support ECU assembly*1
   O106-11 (CANH) - O106-22 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Headlight leveling ECU assembly*2

   • *1: w/ Pre-collision System
   • *2: for Single Beam Headlight

   Result

   Result	Proceed to
   OK	A
   NG (No. 4 CAN junction connector main lines)	B
   NG (ECU or sensor branch lines)	C
   NG (No. 9 CAN junction connector main lines)	D

Result: 

A 

REPLACE NO. 3 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  15

Result: 

D 

See step  13

1. Reconnect the O106 No. 3 CAN junction connector.
2. Disconnect the W13 No. 9 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 9 CAN Junction Connector)
   *b	to No. 3 CAN Junction Connector
   *c	to No. 7 CAN Junction Connector
   *d	to Lane Departure Warning Camera (w/ Lane Departure Alert System)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   W13-1 (CANH) - W13-7 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 3 CAN junction connector
   W13-2 (CANH) - W13-8 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 7 CAN junction connector
   W13-3 (CANH) - W13-9 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Lane departure warning camera*

   1. *: w/ Lane Departure Alert System

   Result

   Result	Proceed to
   OK	A
   NG (No. 3 CAN junction connector main lines)	B
   NG (ECU or sensor branch lines)	C
   NG (No. 7 CAN junction connector main lines)	D

Result: 

A 

REPLACE NO. 9 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  15

Result: 

D 

See step  14

1. Reconnect the W13 No. 9 CAN junction connector.
2. Disconnect the U53 No. 7 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 7 CAN Junction Connector)
   *b	to No. 9 CAN Junction Connector
   *c	to No. 2 CAN Junction Terminal
   *d	to Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   U53-1 (CANH) - U53-12 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 9 CAN junction connector
   U53-2 (CANH) - U53-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 2 CAN junction terminal
   U53-3 (CANH) - U53-14 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Blind spot monitor sensor LH*

   1. *: w/ Blind Spot Monitor System

   Result

   Result	Proceed to
   OK	A
   NG (No. 9 CAN junction connector main lines)	B
   NG (ECU or sensor branch lines)	C
   NG (No. 2 CAN junction terminal main lines)	D

Result: 

A 

REPLACE NO. 7 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR) 

Result: 

D 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL) 

Result: 

C 

See step  15

1. Reconnect all wire harness connectors.
2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line is connected.

   Refer to TERMINALS OF ECU [08/2016 - 11/2017]

3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Network Gateway ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O46-13 (CA2H) - O46-12 (CA2L)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   HINT: 

   If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE CORRESPONDING ECU OR SENSOR 

Result: 

NG 

REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR 

1. Disconnect the O108 No. 4 CAN junction connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3	-	-
   *a	Front view of wire harness connector (to No. 4 CAN Junction Connector)	*b	to Telematics Transceiver (for Lexus Enform Remote Compatible Type)
   *c	to Option Connector (Bus Buffer ECU)	*d	to No. 3 CAN Junction Connector
   *e	to Network Gateway ECU	*f	to Clearance Warning ECU Assembly (w/ Intuitive Parking Assist System)
   *g	to Absorber Control ECU	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result	Connected to
   O108-1 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Clearance warning ECU assembly*1
   O108-12 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O108-2 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Network gateway ECU
   O108-13 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O108-3 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 3 CAN junction connector
   O108-14 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O108-4 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Option connector (bus buffer ECU)
   O108-15 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O108-5 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Telematics transceiver*2
   O108-16 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O108-6 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Absorber control ECU
   O108-17 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O108-1 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Clearance warning ECU assembly*1
   O108-12 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O108-2 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Network gateway ECU
   O108-13 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O108-3 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 3 CAN junction connector
   O108-14 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O108-4 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Option connector (bus buffer ECU)
   O108-15 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O108-5 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Telematics transceiver*2
   O108-16 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O108-6 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Absorber control ECU
   O108-17 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   1. *1: w/ Intuitive Parking Assist System
   2. *2: for Lexus Enform Remote Compatible Type

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

   Result

   Result	Proceed to
   OK	A
   NG (Network gateway ECU main line)	B
   NG (ECU or sensor branch line)	C
   NG (No. 3 CAN junction connector main line)	D

Result: 

A 

REPLACE NO. 4 CAN JUNCTION CONNECTOR 

Result: 

C 

See step  21

Result: 

D 

See step  18

Result: 

B 

See step  17

1. Reconnect the O108 No. 4 CAN junction connector.
2. Disconnect the O46 network gateway ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Network Gateway ECU)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   O46-13 (CA2H) - O46-4 (GND)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
   O46-12 (CA2L) - O46-4 (GND)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O46-13 (CA2H) - O46-2 (BATT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   O46-12 (CA2L) - O46-2 (BATT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NETWORK GATEWAY ECU. Refer to  REMOVAL [09/2014 - 11/2017] 

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NETWORK GATEWAY ECU - NO. 4 CAN JUNCTION CONNECTOR) 

1. Reconnect the O108 No. 4 CAN junction connector.
2. Disconnect the O106 No. 3 CAN junction connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3	-	-
   *a	Front view of wire harness connector (to No. 3 CAN Junction Connector)	*b	to No. 4 CAN Junction Connector
   *c	to No. 9 CAN Junction Connector	*d	to Driving Support ECU Assembly (w/ Pre-collision System)
   *e	to Headlight Leveling ECU Assembly (for Single Beam Headlight)	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result	Connected to
   O106-7 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 4 CAN junction connector
   O106-18 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-8 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 9 CAN junction connector
   O106-19 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-10 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Driving support ECU assembly*1
   O106-21 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-11 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Headlight leveling ECU assembly*2
   O106-22 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-7 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 4 CAN junction connector
   O106-18 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O106-8 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 9 CAN junction connector
   O106-19 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O106-10 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Driving support ECU assembly*1
   O106-21 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O106-11 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Headlight leveling ECU assembly*2
   O106-22 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   • *1: w/ Pre-collision System
   • *2: for Single Beam Headlight

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

   Result

   Result	Proceed to
   OK	A
   NG (ECU or sensor branch line)	B
   NG (No. 4 CAN junction connector main line)	C
   NG (No. 9 CAN junction connector main line)	D

Result: 

A 

REPLACE NO. 3 CAN JUNCTION CONNECTOR 

Result: 

B 

See step  21

Result: 

C 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR) 

Result: 

D 

See step  19

1. Reconnect the O106 No. 3 CAN junction connector.
2. Disconnect the W13 No. 9 CAN junction connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3	-	-
   *a	Front view of wire harness connector (to No. 9 CAN Junction Connector)	*b	to No. 3 CAN Junction Connector
   *c	to No. 7 CAN Junction Connector	*d	to Lane Departure Warning Camera (w/ Lane Departure Alert System)

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result	Connected to
   W13-1 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 3 CAN junction connector
   W13-7 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   W13-2 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 7 CAN junction connector
   W13-8 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   W13-3 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Lane departure warning camera*
   W13-9 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   W13-1 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 3 CAN junction connector
   W13-7 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   W13-2 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 7 CAN junction connector
   W13-8 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   W13-3 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Lane departure warning camera*
   W13-9 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   1. *: w/ Lane Departure Alert System

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

   Result

   Result	Proceed to
   OK	A
   NG (ECU or sensor branch line)	B
   NG (No. 3 CAN junction connector main line)	C
   NG (No. 7 CAN junction connector main line)	D

Result: 

A 

REPLACE NO. 9 CAN JUNCTION CONNECTOR 

Result: 

B 

See step  21

Result: 

C 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR) 

Result: 

D 

See step  20

1. Reconnect the W13 No. 9 CAN junction connector.
2. Disconnect the U53 No. 7 CAN junction connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3	-	-
   *a	Front view of wire harness connector (to No. 7 CAN Junction Connector)	*b	to No. 9 CAN Junction Connector
   *c	to No. 2 CAN Junction Terminal	*d	to Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System)

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result	Connected to
   U53-1 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 9 CAN junction connector
   U53-12 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   U53-2 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 2 CAN junction terminal
   U53-13 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   U53-3 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Blind spot monitor sensor LH*
   U53-14 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   U53-1 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 9 CAN junction connector
   U53-12 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   U53-2 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 2 CAN junction terminal
   U53-13 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   U53-3 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Blind spot monitor sensor LH*
   U53-14 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   1. *: w/ Blind Spot Monitor System

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

   Result

   Result	Proceed to
   OK	A
   NG (No. 9 CAN junction connector main line)	B
   NG (ECU or sensor branch line)	C
   NG (No. 2 CAN junction terminal main line)	D

Result: 

A 

REPLACE NO. 7 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR) 

Result: 

D 

See step  22

Result: 

C 

See step  21

1. Reconnect all wire harness connectors.
2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B or shorted to GND is connected.

   Refer to TERMINALS OF ECU [08/2016 - 11/2017]

3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Network Gateway ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   O46-13 (CA2H) - O46-4 (GND)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
   O46-12 (CA2L) - O46-4 (GND)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O46-13 (CA2H) - O46-2 (BATT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   O46-12 (CA2L) - O46-2 (BATT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.
   • If the resistance becomes normal when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE CORRESPONDING ECU OR SENSOR 

Result: 

NG 

REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINE OR CONNECTOR 

1. Reconnect the U53 No. 7 CAN junction connector.
2. Disconnect the O102 No. 2 CAN junction terminal connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3
   *a	Front view of wire harness connector (to No. 2 CAN Junction Terminal)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   O102-3 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
   O102-2 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O102-3 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   O102-2 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   HINT: 

   • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NO. 2 CAN JUNCTION TERMINAL 

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)