DTC U1002: Lost Communication with Gateway Module (Main Body ECU) [11/2017 - 03/2019]: 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

   *1	DLC3
   *a	Component with harness connected (Main Body ECU (Multiplex Network Body ECU))

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   O1-9 (CANP) - O1-10 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
   			70 Ω or more: Open circuit in main bus lines
   O1-9 (CANP) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
   O1-10 (CANN) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O1-9 (CANP) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   O1-10 (CANN) - O8-16 (BAT)	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  7

Result: 

D 

See step  12

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 > Main Body > Clear DTCs 

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

   Body Electrical > Main Body > Trouble Codes 

   Result

   Result	Proceed to
   DTC U1002 is not output from the main body ECU (multiplex network body ECU) (Techstream display: Main Body)	A
   DTC U1002 is output from the main body ECU (multiplex network body ECU) (Techstream display: Main Body)	B

Result: 

A 

SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019] 

Result: 

B 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU))

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O1-9 (CANP) - O1-10 (CANN)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

Result: 

NG 

See step  4

1. Reconnect the O1 main body ECU (multiplex network body ECU) connector.
2. Disconnect the O101 No. 1 CAN junction terminal connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O101-3 (CANH) - O101-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NO. 1 CAN JUNCTION TERMINAL 

Result: 

NG 

See step  5

1. Reconnect the O101 No. 1 CAN junction terminal 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. 5 CAN Junction Connector
   *c	to Main Body ECU (Multiplex Network Body ECU)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   O106-2 (CANH) - O106-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 5 CAN junction connector
   O106-3 (CANH) - O106-14 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Main body ECU (multiplex network body ECU)

   Result

   Result	Proceed to
   OK	A
   NG (Main body ECU (multiplex network body ECU) main lines)	B
   NG (No. 5 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 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

Result: 

C 

See step  6

1. Reconnect the O106 No. 3 CAN junction connector.
2. Disconnect the T32 No. 5 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 5 CAN Junction Connector)
   *b	to No. 3 CAN Junction Connector
   *c	to No. 1 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
   T32-8 (CANH) - T32-19 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 3 CAN junction connector
   T32-11 (CANH) - T32-22 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction terminal

   Result

   Result	Proceed to
   OK	A
   NG (No. 3 CAN junction connector main lines)	B
   NG (No. 1 CAN junction terminal main lines)	C

Result: 

A 

REPLACE NO. 5 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR) 

Result: 

C 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL) 

1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU))

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O1-9 (CANP) - O1-10 (CANN)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

Result: 

NG 

See step  8

1. Reconnect the O1 main body ECU (multiplex network body ECU) connector.
2. Disconnect the O101 No. 1 CAN junction terminal connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O101-3 (CANH) - O101-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NO. 1 CAN JUNCTION TERMINAL 

Result: 

NG 

See step  9

1. Reconnect the O101 No. 1 CAN junction terminal 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 Multiplex Tilt and Telescopic ECU
   *c	to No. 5 CAN Junction Connector
   *d	to Main Body ECU (Multiplex Network Body ECU)
   *e	to Outer Mirror Control ECU Assembly (for Driver Side) (w/ Seat Position Memory System)
   *f	to Headlight Light Control ECU Sub-assembly LH (for Triple Beam Headlight)
   *g	to Position Control ECU and Switch Assembly LH

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   O106-1 (CANH) - O106-12 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Multiplex tilt and telescopic ECU
   O106-2 (CANH) - O106-13 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 5 CAN junction connector
   O106-3 (CANH) - O106-14 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Main body ECU (multiplex network body ECU)
   O106-4 (CANH) - O106-15 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Outer mirror control ECU assembly (for driver side)*1
   O106-5 (CANH) - O106-16 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Headlight light control ECU sub-assembly LH*2
   O106-6 (CANH) - O106-17 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Position control ECU and switch assembly LH

   • *1: w/ Seat Position Memory System
   • *2: for Triple Beam Headlight

   Result

   Result	Proceed to
   OK	A
   NG (Main body ECU (multiplex network body ECU) main lines)	B
   NG (ECU or sensor branch lines)	C
   NG (No. 5 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 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

Result: 

C 

See step  11

Result: 

D 

See step  10

1. Reconnect the O106 No. 3 CAN junction connector.
2. Disconnect the T32 No. 5 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 5 CAN Junction Connector)
   *b	to No. 3 CAN Junction Connector
   *c	to Position Control ECU and Switch Assembly RH
   *d	to Outer Mirror Control ECU Assembly (for Front Passenger Side) (w/ Seat Position Memory System)
   *e	to No. 1 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
   T32-8 (CANH) - T32-19 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 3 CAN junction connector
   T32-9 (CANH) - T32-20 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Position control ECU and switch assembly RH
   T32-10 (CANH) - T32-21 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Outer mirror control ECU assembly (for front passenger side)*
   T32-11 (CANH) - T32-22 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction terminal

   1. *: w/ Seat Position Memory 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. 1 CAN junction terminal main lines)	D

Result: 

A 

REPLACE NO. 5 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR) 

Result: 

D 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL) 

Result: 

C 

See step  11

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 [11/2017 - 03/2019]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O1-9 (CANP) - O1-10 (CANN)	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.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Main Body ECU (Multiplex Network Body ECU))

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE ECU OR SENSOR 

Result: 

NG 

REPAIR OR REPLACE ECU OR SENSOR BRANCH LINES OR CONNECTOR 

1. Disconnect the O106 No. 3 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. 3 CAN Junction Connector)	*b	to Multiplex Tilt and Telescopic ECU
   *c	to No. 5 CAN Junction Connector	*d	to Main Body ECU (Multiplex Network Body ECU)
   *e	to Outer Mirror Control ECU Assembly (for Driver Side) (w/ Seat Position Memory System)	*f	to Headlight Light Control ECU Sub-assembly LH (for Triple Beam Headlight)
   *g	to Position Control ECU and Switch Assembly LH	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result	Connected to
   O106-1 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Multiplex tilt and telescopic ECU
   O106-12 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-2 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 5 CAN junction connector
   O106-13 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-3 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Main body ECU (multiplex network body ECU)
   O106-14 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-4 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Outer mirror control ECU assembly (for driver side)*1
   O106-15 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-5 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Headlight light control ECU sub-assembly LH*2
   O106-16 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-6 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Position control ECU and switch assembly LH
   O106-17 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O106-1 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Multiplex tilt and telescopic ECU
   O106-12 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O106-2 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 5 CAN junction connector
   O106-13 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O106-3 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Main body ECU (multiplex network body ECU)
   O106-14 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O106-4 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Outer mirror control ECU assembly (for driver side)*1
   O106-15 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O106-5 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Headlight light control ECU sub-assembly LH*2
   O106-16 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   O106-6 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Position control ECU and switch assembly LH
   O106-17 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   • *1: w/ Seat Position Memory System
   • *2: for Triple 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 1 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

   Result

   Result	Proceed to
   OK	A
   NG (Main body ECU (multiplex network body ECU) main line)	B
   NG (ECU or sensor branch line)	C
   NG (No. 5 CAN junction connector main line)	D

Result: 

A 

REPLACE NO. 3 CAN JUNCTION CONNECTOR 

Result: 

C 

See step  15

Result: 

D 

See step  14

Result: 

B 

See step  13

1. Reconnect the O106 No. 3 CAN junction connector.
2. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3
   *a	Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU))

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   O1-9 (CANP) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
   O1-10 (CANN) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O1-9 (CANP) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   O1-10 (CANN) - 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 1 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

1. Reconnect the O106 No. 3 CAN junction connector.
2. Disconnect the T32 No. 5 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. 5 CAN Junction Connector)	*b	to No. 3 CAN Junction Connector
   *c	to Position Control ECU and Switch Assembly RH	*d	to Outer Mirror Control ECU Assembly (for Front Passenger Side) (w/ Seat Position Memory System)
   *e	to No. 1 CAN Junction Terminal	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result	Connected to
   T32-8 (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
   T32-19 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   T32-9 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Position control ECU and switch assembly RH
   T32-20 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   T32-10 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	Outer mirror control ECU assembly (for front passenger side)*
   T32-21 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   T32-11 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground	No. 1 CAN junction terminal
   T32-22 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   T32-8 (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
   T32-19 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   T32-9 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Position control ECU and switch assembly RH
   T32-20 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   T32-10 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Outer mirror control ECU assembly (for front passenger side)*
   T32-21 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
   T32-11 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 1 CAN junction terminal
   T32-22 (CANL) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

   1. *: w/ Seat Position Memory 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 1 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

   Result

   Result	Proceed to
   OK	A
   NG (No. 3 CAN junction connector main line)	B
   NG (ECU or sensor branch line)	C
   NG (No. 1 CAN junction terminal main line)	D

Result: 

A 

REPLACE NO. 5 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR) 

Result: 

D 

See step  16

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 bus line shorted to +B or shorted to GND is connected.

   Refer to TERMINALS OF ECU [11/2017 - 03/2019]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3
   *a	Component with harness connected (Main Body ECU (Multiplex Network Body ECU))

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   O1-9 (CANP) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
   O1-10 (CANN) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O1-9 (CANP) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   O1-10 (CANN) - 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 1 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 1 inspection.

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE ECU OR SENSOR 

Result: 

NG 

REPAIR OR REPLACE ECU OR SENSOR BRANCH LINE OR CONNECTOR 

1. Reconnect the T32 No. 5 CAN junction connector.
2. Disconnect the O101 No. 1 CAN junction terminal connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   O101-3 (CANH) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
   O101-2 (CANL) - O8-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
   O101-3 (CANH) - O8-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
   O101-2 (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 1 inspection.
   • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NO. 1 CAN JUNCTION TERMINAL 

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)