Check Bus 3 Lines for Short Circuit [10/2022 - ]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the 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 Bus Buffer ECU (w/ Bus Buffer ECU)
   *c	to Central Gateway ECU (Network Gateway ECU)	*d	to DCM (Telephone Transceiver Assembly) (w/ Telematics System)
   *e	to Central Gateway ECU (Network Gateway ECU)	*f	to Radio and Display Receiver Assembly (for Radio and Display Type)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   G105-1 (CANH) - G105-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Bus buffer ECU*1
   G105-2 (CANH) - G105-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)
   G105-3 (CANH) - G105-14 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	DCM (telephone transceiver assembly)*3
   G105-4 (CANH) - G105-15 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)
   G105-5 (CANH) - G105-16 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Radio and display receiver assembly*2

   *1: w/ Bus Buffer ECU

   *2: for Radio and Display Type

   *3: w/ Telematics System

   Result

   Result	Proceed to
   OK	A
   NG (Central gateway ECU [network gateway ECU] CAN main wire)	B
   NG (Wire to ECU or sensor)	C

Result: 

A 

REPLACE NO. 5 CAN JUNCTION CONNECTOR 

Result: 

C 

See step  3

Result: 

B 

See step  2

1. Reconnect the G105 No. 5 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])

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G72-6 (CA3H) - G72-21 (CA3L)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
   G72-19 (CAYH) - G72-20 (CAYL)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

Refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result: 

NG 

REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 5 CAN JUNCTION CONNECTOR) 

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 [10/2022 - 10/2023] , or refer to TERMINALS OF ECU [10/2023 - ]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G72-6 (CA3H) - G72-21 (CA3L)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Central Gateway ECU [Network Gateway ECU])

   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.
   • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short in the wire harness and repair or replace the wire harness or connector if necessary.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECU OR SENSOR 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR