DTC U1002: Lost Communication with Gateway Module (Main Body ECU) [10/2016 - 09/2018]: Procedure

CHECK SUB BUS 1

Disconnect the cable from the negative (-) battery terminal.

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
K1-9 (CANP) - K1-10 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
K1-9 (CANP) - K1-10 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω	70 Ω or higher: Open circuit in main bus lines
K1-9 (CANP) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short
K1-10 (CANN) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short
K1-9 (CANP) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
K1-10 (CANN) - K9-16 (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
Ground short +B short	D

Result:

See step 3

Result:

See step 8

Result:

See step 14

Result:

See step 2

CHECK FOR DTC OUTPUT

Reconnect the cable to the negative (-) battery terminal.
Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
Turn the engine switch off.
Turn the engine switch on (IG).

Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

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

Result:

SYMPTOM SIMULATION. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2016 - 10/2017] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2020]

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [04/2013 - ]

CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

Disconnect the K1 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))

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

Standard Resistance

Tester Connection	Condition	Specified Condition
K1-9 (CANP) - K1-10 (CANN)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result

Result
OK
NG

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [04/2013 - ]

Result:

See step 4

CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 1 CAN JUNCTION TERMINAL)

Reconnect the K1 main body ECU (multiplex network body ECU) connector.

Disconnect the K106 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)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
K106-3 (CANH) - K106-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result

Result
OK
NG

Result:

REPLACE NO. 1 CAN JUNCTION TERMINAL

Result:

See step 5

CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 12 CAN JUNCTION CONNECTOR)

Reconnect the K106 No. 1 CAN junction terminal connector.

Disconnect the K152 No. 12 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 12 CAN Junction Connector)
*b	to No. 13 Junction Connector
*c	to Main Body ECU (Multiplex Network Body ECU)

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
K152-8 (CANH) - K152-19 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 13 junction connector
K152-9 (CANH) - K152-20 (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. 13 junction connector main lines)	C

Result:

REPLACE NO. 12 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

Result:

See step 6

CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 13 JUNCTION CONNECTOR)

Reconnect the K152 No. 12 CAN junction connector.

Disconnect the Q57 No. 13 junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 13 Junction Connector)
*b	to No. 3 CAN Junction Connector
*c	to No. 12 CAN Junction Connector

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
Q57-9 (CANH) - Q57-20 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 3 CAN junction connector
Q57-10 (CANH) - Q57-21 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 12 CAN junction connector

Result

Result	Proceed to
OK	A
NG (Line to No. 12 CAN junction connector)	B
NG (Line to No. 3 CAN junction connector)	C

Result:

REPLACE NO. 13 JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - NO. 13 JUNCTION CONNECTOR)

Result:

See step 7

CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 3 CAN JUNCTION CONNECTOR)

Reconnect the Q57 No. 13 junction connector.

Disconnect the K111 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. 13 Junction Connector
*c	to No. 1 CAN Junction Terminal

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
K111-7 (CANH) - K111-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 13 junction connector
K111-11 (CANH) - K111-22 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction terminal

Result

Result	Proceed to
OK	A
NG (Line to No. 13 junction connector)	B
NG (Line to No. 1 CAN junction terminal)	C

Result:

REPLACE NO. 3 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 13 JUNCTION CONNECTOR)

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

Disconnect the K1 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))

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

Standard Resistance

Tester Connection	Condition	Specified Condition
K1-9 (CANP) - K1-10 (CANN)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result

Result
OK
NG

Result:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [04/2013 - ]

Result:

See step 9

CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 1 CAN JUNCTION TERMINAL)

Reconnect the K1 main body ECU (multiplex network body ECU) connector.

Disconnect the K106 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)

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

Standard Resistance

Tester Connection	Condition	Specified Condition
K106-3 (CANH) - K106-2 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

Result

Result
OK
NG

Result:

REPLACE NO. 1 CAN JUNCTION TERMINAL

Result:

See step 10

CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 12 CAN JUNCTION CONNECTOR)

Reconnect the K106 No. 1 CAN junction terminal connector.

Disconnect the K152 No. 12 CAN junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 12 CAN Junction Connector)
*b	to No. 13 Junction Connector
*c	to Main Body ECU (Multiplex Network Body ECU)
*d	to Outer Mirror Control ECU Assembly (for Driver Side) (w/ Seat Position Memory System)
*e	to No. 1 Headlight ECU Sub-assembly LH (w/o AFS)

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
K152-8 (CANH) - K152-19 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 13 junction connector
K152-9 (CANH) - K152-20 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Main body ECU (multiplex network body ECU)
K152-10 (CANH) - K152-21 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Outer mirror control ECU assembly (for driver side)*1
K152-11 (CANH) - K152-22 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	No. 1 headlight ECU sub-assembly LH*2

*1: w/ Seat Position Memory System
*2: w/o AFS

Result

Result	Proceed to
OK	A
NG (Line to main body ECU (multiplex network body ECU))	B
NG (Line to ECU or sensor)	C
NG (Line to No. 13 junction connector)	D

Result:

REPLACE NO. 12 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

Result:

See step 13

Result:

See step 11

CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 13 JUNCTION CONNECTOR)

Reconnect the K152 No. 12 CAN junction connector.

Disconnect the Q57 No. 13 junction connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to No. 13 Junction Connector)
*b	to Front Power Seat Switch LH (w/ Seat Position Memory System)
*c	to No. 3 CAN Junction Connector
*d	to No. 12 CAN Junction Connector
*e	to Rear Television Camera Assembly (w/ Parking Assist Monitor System)

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
Q57-8 (CANH) - Q57-19 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Front power seat switch LH*1
Q57-9 (CANH) - Q57-20 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 3 CAN junction connector
Q57-10 (CANH) - Q57-21 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 12 CAN junction connector
Q57-11 (CANH) - Q57-22 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Rear television camera assembly*2

*1: w/ Seat Position Memory System
*2: w/ Parking Assist Monitor System

Result

Result	Proceed to
OK	A
NG (Line to No. 12 CAN junction connector)	B
NG (Line to ECU or sensor)	C
NG (Line to No. 3 CAN junction connector)	D

Result:

REPLACE NO. 13 JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - NO. 13 JUNCTION CONNECTOR)

Result:

See step 13

Result:

See step 12

CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 3 CAN JUNCTION CONNECTOR)

Reconnect the Q57 No. 13 junction connector.

Disconnect the K111 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. 13 Junction Connector
*c	to Multiplex Tilt and Telescopic ECU (w/ Power Tilt and Power Telescopic System)
*d	to Outer Mirror Control ECU Assembly (for Front Passenger Side) (w/ Seat Position Memory System)
*e	to No. 1 CAN Junction Terminal

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
K111-7 (CANH) - K111-18 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 13 junction connector
K111-8 (CANH) - K111-19 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Multiplex tilt and telescopic ECU*1
K111-10 (CANH) - K111-21 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Outer mirror control ECU assembly (for front passenger side)*2
K111-11 (CANH) - K111-22 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction terminal

*1: w/ Power Tilt and Power Telescopic System
*2: w/ Seat Position Memory System

Result

Result	Proceed to
OK	A
NG (Line to No. 13 junction connector)	B
NG (Line to ECU or sensor)	C
NG (Line to No. 1 CAN junction terminal)	D

Result:

REPLACE NO. 3 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 13 JUNCTION CONNECTOR)

Result:

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

Result:

See step 13

CHECK FOR SHORT IN SUB BUS 1 LINES (ECU, SENSOR)

Reconnect all wire harness connectors.
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 [10/2016 - 10/2017] , or refer to TERMINALS OF ECU [10/2017 - 09/2018]

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Condition	Specified Condition
K1-9 (CANP) - K1-10 (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.

Result

Result
OK
NG

Result:

REPLACE CORRESPONDING ECU OR SENSOR

Result:

REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINES OR CONNECTOR

CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 12 CAN JUNCTION CONNECTOR)

Disconnect the K152 No. 12 CAN junction connector.

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. 12 CAN Junction Connector)	*b	to No. 13 Junction Connector
*c	to Main Body ECU (Multiplex Network Body ECU)	*d	to Outer Mirror Control ECU Assembly (for Driver Side) (w/ Seat Position Memory System)
*e	to No. 1 Headlight ECU Sub-assembly LH (w/o AFS)	-	-

Standard Resistance

Tester Connection	Condition	Specified Condition	Result	Connected to
K152-8 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	No. 13 junction connector
K152-19 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	No. 13 junction connector
K152-9 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	Main body ECU (multiplex network body ECU)
K152-20 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	Main body ECU (multiplex network body ECU)
K152-10 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	Outer mirror control ECU assembly (for driver side)*1
K152-21 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	Outer mirror control ECU assembly (for driver side)*1
K152-11 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	No. 1 headlight ECU sub-assembly LH*2
K152-22 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	No. 1 headlight ECU sub-assembly LH*2
K152-8 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 13 junction connector
K152-19 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	No. 13 junction connector
K152-9 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Main body ECU (multiplex network body ECU)
K152-20 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	Main body ECU (multiplex network body ECU)
K152-10 (CANH) - K9-16 (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
K152-21 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	Outer mirror control ECU assembly (for driver side)*1
K152-11 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 1 headlight ECU sub-assembly LH*2
K152-22 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	No. 1 headlight ECU sub-assembly LH*2

*1: w/ Seat Position Memory System
*2: w/o AFS

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 (Line to main body ECU (multiplex network body ECU))	B
NG (Line to ECU or sensor)	C
NG (Line to No. 13 junction connector)	D

Result:

REPLACE NO. 12 CAN JUNCTION CONNECTOR

Result:

See step 18

Result:

See step 16

Result:

See step 15

CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

Reconnect the K152 No. 12 CAN junction connector.

Disconnect the K1 main body ECU (multiplex network body ECU).

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
K1-9 (CANP) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short
K1-10 (CANN) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short
K1-9 (CANP) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
K1-10 (CANN) - K9-16 (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:

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL [04/2013 - ]

Result:

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 13 JUNCTION CONNECTOR)

Reconnect the K152 No. 12 CAN junction connector.
Disconnect the Q57 No. 13 junction connector.

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

*1	DLC3	-	-
*a	Front view of wire harness connector (to No. 13 Junction Connector)	*b	to Front Power Seat Switch LH (w/ Seat Position Memory System)
*c	to No. 3 CAN Junction Connector	*d	to No. 12 CAN Junction Connector
*e	to Rear Television Camera Assembly (w/ Parking Assist Monitor System)	-	-

Standard Resistance

Tester Connection	Condition	Specified Condition	Result	Connected to
Q57-8 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	Front power seat switch LH*1
Q57-19 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	Front power seat switch LH*1
Q57-9 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	No. 3 CAN junction connector
Q57-20 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	No. 3 CAN junction connector
Q57-10 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	No. 12 CAN junction connector
Q57-21 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	No. 12 CAN junction connector
Q57-11 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	Rear television camera assembly*2
Q57-22 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	Rear television camera assembly*2
Q57-8 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Front power seat switch LH*1
Q57-19 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	Front power seat switch LH*1
Q57-9 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 3 CAN junction connector
Q57-20 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	No. 3 CAN junction connector
Q57-10 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 12 CAN junction connector
Q57-21 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	No. 12 CAN junction connector
Q57-11 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Rear television camera assembly*2
Q57-22 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	Rear television camera assembly*2

*1: w/ Seat Position Memory System
*2: w/ Parking Assist 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 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 (Line to No. 12 CAN junction connector)	B
NG (Line to ECU or sensor)	C
NG (Line to No. 3 CAN junction connector)	D

Result:

REPLACE NO. 13 JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 12 CAN JUNCTION CONNECTOR - NO. 13 JUNCTION CONNECTOR)

Result:

See step 18

Result:

See step 17

CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 3 CAN JUNCTION CONNECTOR)

Reconnect the Q57 No. 13 junction connector.
Disconnect the K111 No. 3 CAN junction connector.

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

*1	DLC3	-	-
*a	Front view of wire harness connector (to No. 3 CAN Junction Connector)	*b	to No. 13 Junction Connector
*c	to Multiplex Tilt and Telescopic ECU (w/ Power Tilt and Power Telescopic System)	*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
K111-7 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	No. 13 junction connector
K111-18 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	No. 13 junction connector
K111-8 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	Multiplex tilt and telescopic ECU*1
K111-19 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	Multiplex tilt and telescopic ECU*1
K111-10 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	Outer mirror control ECU assembly (for front passenger side)*2
K111-21 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short
K111-11 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short	No. 1 CAN junction terminal
K111-22 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short	No. 1 CAN junction terminal
K111-7 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 13 junction connector
K111-18 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	No. 13 junction connector
K111-8 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	Multiplex tilt and telescopic ECU*1
K111-19 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	Multiplex tilt and telescopic ECU*1
K111-10 (CANH) - K9-16 (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)*2
K111-21 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short
K111-11 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short	No. 1 CAN junction terminal
K111-22 (CANL) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short	No. 1 CAN junction terminal

*1: w/ Power Tilt and Power Telescopic System
*2: 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 (Line to No. 13 junction connector)	B
NG (Line to ECU or sensor)	C
NG (Line to No. 1 CAN junction terminal)	D

Result:

REPLACE NO. 3 CAN JUNCTION CONNECTOR

Result:

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 13 JUNCTION CONNECTOR)

Result:

See step 19

Result:

See step 18

CHECK FOR SHORT IN SUB BUS 1 LINE (ECU, SENSOR)

Reconnect all wire harness connectors.
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 [10/2016 - 10/2017] , or refer to TERMINALS OF ECU [10/2017 - 09/2018]

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
K1-9 (CANP) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short
K1-10 (CANN) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short
K1-9 (CANP) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
K1-10 (CANN) - K9-16 (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:

REPLACE CORRESPONDING ECU OR SENSOR

Result:

REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINE OR CONNECTOR

CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 1 CAN JUNCTION TERMINAL)

Reconnect the K111 No. 3 CAN junction connector.

Disconnect the K106 No. 1 CAN junction terminal connector.

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Result
K106-3 (CANH) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANH ground short
K106-2 (CANL) - K9-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Below 200 Ω: CANL ground short
K106-3 (CANH) - K9-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
K106-2 (CANL) - K9-16 (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:

REPLACE NO. 1 CAN JUNCTION TERMINAL

Result:

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)