Check Bus 1 Line for Short to +B [10/2018 - 08/2021]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the No. 2 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. 2 CAN Junction Connector)	*b	to No. 8 CAN Junction Connector
   *c	to Central Gateway ECU (Network Gateway ECU)	*d	to Clearance Warning ECU Assembly (w/ Parking Support Alert System)
   *e	to Forward Recognition Camera	*f	to Millimeter Wave Radar Sensor Assembly

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   F86-1 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	No. 8 CAN junction connector
   F86-7 (CANL) - F58-16 (BAT)
   F86-2 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Central gateway ECU (network gateway ECU)
   F86-8 (CANL) - F58-16 (BAT)
   F86-3 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Clearance warning ECU assembly*1
   F86-9 (CANL) - F58-16 (BAT)
   F86-5 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Forward recognition camera
   F86-11 (CANL) - F58-16 (BAT)
   F86-6 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Millimeter wave radar sensor assembly
   F86-12 (CANL) - F58-16 (BAT)

   1. *1: w/ Parking Support Alert System

   Result

   Result	Proceed to
   OK	A
   NG (Line to central gateway ECU (network gateway ECU))	B
   NG (Line to No. 8 CAN junction connector)	C
   NG (Line to ECU or sensor)	D

Result: 

A 

REPLACE NO. 2 CAN JUNCTION CONNECTOR 

Result: 

C 

See step  3

Result: 

D 

See step  4

Result: 

B 

See step  2

1. Disconnect the F61 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. 2 CAN Junction Connector)	*b	to Central Gateway ECU (Network Gateway ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F86-2 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
   F86-8 (CANL) - F58-16 (BAT)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [10/2018 - 07/2022] 

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

1. Disconnect the No. 8 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. 8 CAN Junction Connector)	*b	to No. 2 CAN Junction Connector
   *c	to Rear Television Camera Assembly	*d	to Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System)
   *e	to No. 2 CAN Junction Terminal	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Connected to
   N111-1 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	No. 2 CAN junction connector
   N111-7 (CANL) - F58-16 (BAT)
   N111-2 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Rear television camera assembly
   N111-8 (CANL) - F58-16 (BAT)
   N111-5 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Blind spot monitor sensor LH*1
   N111-11 (CANL) - F58-16 (BAT)
   N111-6 (CANH) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	No. 2 CAN junction terminal
   N111-12 (CANL) - F58-16 (BAT)

   1. *1: w/ Blind Spot Monitor System

   Result

   Result	Proceed to
   OK	A
   NG (Line to No. 2 CAN junction connector)	B
   NG (Line to ECU or sensor)	C

Result: 

A 

REPLACE NO. 8 CAN JUNCTION CONNECTOR 

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 8 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 +B is connected.

   Refer to TERMINALS OF ECU [10/2018 - 10/2019] Refer to TERMINALS OF ECU [10/2019 - 08/2021]

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
   F61-23 (CA1H) - F58-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
   F61-8 (CA1L) - F58-16 (BAT)

   HINT: 

   • If the resistance changes to 6 kΩ 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 +B 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