Check Bus 4 Line for Short to GND [12/2021 - 10/2022]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the No. 1 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 1 CAN Junction Connector)	*b	to No. 4 CAN Junction Connector
   *c	to No. 6 CAN Junction Connector	*d	to Steering Sensor
   *e	Front view of DLC3	*f	to Brake Actuator Assembly (No. 2 Skid Control ECU)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   G96-8 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Brake actuator assembly (No. 2 skid control ECU)
   G96-19 (CANL) - G114-4 (CG)
   G96-9 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	No. 4 CAN junction connector
   G96-20 (CANL) - G114-4 (CG)
   G96-10 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	No. 6 CAN junction connector
   G96-21 (CANL) - G114-4 (CG)
   G96-11 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Steering sensor
   G96-22 (CANL) - G114-4 (CG)

   Result

   Result	Proceed to
   OK	A
   NG (No. 6 CAN junction connector CAN main wire)	B
   NG (No. 4 CAN junction connector CAN main wire)	C
   NG (Wire to ECU or sensor)	D

Result: 

A 

REPLACE NO. 1 CAN JUNCTION CONNECTOR 

Result: 

C 

See step  4

Result: 

D 

See step  5

Result: 

B 

See step  2

1. Reconnect the G96 No. 1 CAN junction connector.
2. Disconnect the No. 6 CAN junction connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to No. 6 CAN Junction Connector)	*b	to Tire Pressure Warning ECU and Receiver (w/ Tire Pressure System [Tire Inflation Pressure Display Function])
   *c	to Occupant Detection ECU	*d	to Central Gateway ECU (Network Gateway ECU)
   *e	to No. 1 CAN Junction Connector	*f	Front view of DLC3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   M31-1 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Tire pressure warning ECU and receiver*
   M31-7 (CANL) - G114-4 (CG)
   M31-2 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Occupant detection ECU
   M31-8 (CANL) - G114-4 (CG)
   M31-3 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Central gateway ECU (network gateway ECU)
   M31-9 (CANL) - G114-4 (CG)
   M31-4 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	No. 1 CAN junction connector
   M31-10 (CANL) - G114-4 (CG)

   *: w/ Tire Pressure System (Tire Inflation Pressure Display Function)

   Result

   Result	Proceed to
   OK	A
   NG (Central gateway ECU [network gateway ECU] CAN main wire)	B
   NG (No. 1 CAN junction connector CAN main wire)	C
   NG (Wire to ECU or sensor)	D

Result: 

A 

REPLACE NO. 6 CAN JUNCTION CONNECTOR 

Result: 

C 

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

Result: 

D 

See step  5

Result: 

B 

See step  3

1. Reconnect the M31 No. 6 CAN junction connector.
2. Disconnect the central gateway ECU (network gateway ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Central Gateway ECU [Network Gateway ECU])
   *b	Front view of DLC3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G72-22 (CA2H) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   G72-7 (CA2L) - G114-4 (CG)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

Refer to REMOVAL [12/2021 - 10/2022]

Result: 

NG 

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR) 

1. Reconnect the G96 No. 1 CAN junction connector.
2. Disconnect the 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 Brake Booster with Master Cylinder Assembly (No. 1 Skid Control ECU)
   *c	to Airbag ECU Assembly	*d	to Hybrid Vehicle Control ECU Assembly
   *e	to No. 1 CAN Junction Connector	*f	to Rack and Pinion Power Steering Gear Assembly
   *g	to ECM	*h	Front view of DLC3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   G104-1 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Brake booster with master cylinder assembly (No. 1 skid control ECU)
   G104-7 (CANL) - G114-4 (CG)
   G104-2 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Airbag ECU assembly
   G104-8 (CANL) - G114-4 (CG)
   G104-3 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Hybrid vehicle control ECU assembly
   G104-9 (CANL) - G114-4 (CG)
   G104-4 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	No. 1 CAN junction connector
   G104-10 (CANL) - G114-4 (CG)
   G104-5 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Rack and pinion power steering gear assembly
   G104-11 (CANL) - G114-4 (CG)
   G104-6 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	ECM
   G104-12 (CANL) - G114-4 (CG)

   Result

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

Result: 

A 

REPLACE NO. 4 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 

Result: 

C 

See step  5

1. Reconnect the CAN junction connector.
2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short to ground is connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Central Gateway ECU [Network Gateway ECU])
   *b	Front view of DLC3

   Refer to TERMINALS OF ECU [12/2021 - 10/2022]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G72-22 (CA2H) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   G72-7 (CA2L) - G114-4 (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

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR ECU OR SENSOR 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR