Check Bus 3 Line for Short to GND [10/2019 - 08/2020]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the G98 No. 4 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. 4 CAN Junction Connector)	*b	to DCM (Telematics Transceiver) (w/ Telematics Transceiver)
   *c	to Central Gateway ECU (Network Gateway ECU)	*d	to Option Connector (Bus Buffer ECU) (w/ CAN Compatible Optional Devices)

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   G98-8 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	DCM (telematics transceiver)*1
   G98-19 (CANL) - G57-4 (CG)
   G98-9 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Central gateway ECU (network gateway ECU)
   G98-20 (CANL) - G57-4 (CG)
   G98-10 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Option connector (bus buffer ECU)*2
   G98-21 (CANL) - G57-4 (CG)
   G98-11 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Central gateway ECU (network gateway ECU)
   G98-22 (CANL) - G57-4 (CG)

   • *1: w/ Telematics Transceiver
   • *2: w/ CAN Compatible Optional Devices

   HINT: 

   If there is a short to ground in a CAN bus line without any CAN compatible optional devices connected to the option connector, repair or replace the CAN bus branch line or the option connector.

   Result

   Result	Proceed to
   OK	A
   NG (Line to central gateway ECU (network gateway ECU))	B
   NG (Line to ECU or sensor)	C

Result: 

B 

See step  3

Result: 

C 

See step  4

Result: 

A 

See step  2

1. Disconnect the G99 No. 4 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. 4 CAN Junction Connector)	*b	to Radio Receiver Assembly
   *c	to Stereo Component Equalizer Assembly (w/ Active Noise Control System)	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   G99-1 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Radio receiver assembly
   G99-12 (CANL) - G57-4 (CG)
   G99-2 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Stereo component equalizer assembly*
   G99-13 (CANL) - G57-4 (CG)

   1. *: w/ Active Noise Control System

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE NO. 4 CAN JUNCTION CONNECTOR 

Result: 

NG 

See step  4

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. 4 CAN Junction Connector)	*b	to Central Gateway ECU (Network Gateway ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G98-9 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
   G98-20 (CANL) - G57-4 (CG)
   G98-11 (CANH) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
   G98-22 (CANL) - G57-4 (CG)

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [06/2018 - 08/2021] 

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

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 [10/2019 - 08/2020]

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
   G66-6 (CA3H) - G57-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
   G66-21 (CA3L) - 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