Check Bus 1 Line for Short to GND [09/2022 - ]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the A81 No. 1 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. 1 CAN Junction Connector)	*b	to Millimeter Wave Radar Sensor Assembly
   *c	to Forward Recognition Camera	*d	to Central Gateway ECU (Network Gateway ECU)
   *e	to No. 6 CAN Junction Connector	*f	to Parking Assist ECU (w/ Panoramic View Monitor System)
   *g	to Clearance Warning ECU Assembly (w/ Parking Support Brake System)	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   A81-1 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Millimeter wave radar sensor assembly
   A81-7 (CANL) - G57-4 (CG)
   A81-2 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Forward recognition camera
   A81-8 (CANL) - G57-4 (CG)
   A81-3 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Central gateway ECU (network gateway ECU)
   A81-9 (CANL) - G57-4 (CG)
   A81-4 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	No. 6 CAN junction connector
   A81-10 (CANL) - G57-4 (CG)
   A81-5 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Parking assist ECU*1
   A81-11 (CANL) - G57-4 (CG)
   A81-6 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Clearance warning ECU assembly*2
   A81-12 (CANL) - G57-4 (CG)

   • *1: w/ Panoramic View Monitor System
   • *2: w/ Parking Support Brake System

   Result

   Result	Proceed to
   OK	A
   NG (Line to central gateway ECU (network gateway ECU))	B
   NG (Line to No. 6 CAN junction connector)	C
   NG (Line to ECU or sensor)	D

Result: 

A 

REPLACE NO. 1 CAN JUNCTION CONNECTOR 

Result: 

C 

See step  3

Result: 

D 

See step  4

Result: 

B 

See step  2

1. Disconnect the G66 central gateway ECU (network gateway ECU) 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. 1 CAN Junction Connector)	*b	to Central Gateway ECU (Network Gateway ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A81-3 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
   A81-9 (CANL) - G57-4 (CG)

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [09/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

1. Disconnect the N125 No. 6 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. 6 CAN Junction Connector)	*b	to No. 1 CAN Junction Terminal
   *c	to Blind Spot Monitor Sensor RH (w/ Blind Spot Monitor System)	*d	to Rear Television Camera Assembly (w/ Parking Assist Monitor System)
   *e	to No. 1 CAN Junction Connector	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   N125-1 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	No. 1 CAN junction terminal
   N125-7 (CANL) - G57-4 (CG)
   N125-3 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Blind spot monitor sensor RH*1
   N125-9 (CANL) - G57-4 (CG)
   N125-4 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Rear television camera assembly*2
   N125-10 (CANL) - G57-4 (CG)
   N125-5 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	No. 1 CAN junction connector
   N125-11 (CANL) - G57-4 (CG)

   • *1: w/ Blind Spot Monitor System
   • *2: w/ Parking Assist Monitor System

   Result

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

Result: 

A 

REPLACE NO. 6 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  4

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 GND is connected.

   Refer to TERMINALS OF ECU [09/2022 - ]

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 (Central Gateway ECU (Network Gateway ECU))	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G66-23 (CA1H) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
   G66-8 (CA1L) - G57-4 (CG)

   HINT: 

   • If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
   • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to ground in the wire harness and repair or replace the wire harness or connector if necessary.

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE ECU OR SENSOR 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR