Check Bus 1 Lines for Short Circuit [08/2021 - 09/2022]: Procedure

CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR)

Disconnect the cable from the negative (-) battery terminal.
Disconnect the A81 No. 1 CAN junction connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*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) - A81-7 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Millimeter wave radar sensor assembly
A81-2 (CANH) - A81-8 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Forward recognition camera
A81-3 (CANH) - A81-9 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)
A81-4 (CANH) - A81-10 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 6 CAN junction connector
A81-5 (CANH) - A81-11 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Parking assist ECU*1
A81-6 (CANH) - A81-12 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Clearance warning ECU assembly*2

*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:

REPLACE NO. 1 CAN JUNCTION CONNECTOR

Result:

See step 3

Result:

See step 5

Result:

See step 2

CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

Disconnect the G66 central gateway ECU (network gateway ECU) connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Front view of wire harness connector
(to No. 1 CAN Junction Connector)

to Central Gateway ECU (Network Gateway ECU)

Standard Resistance

Tester Connection	Condition	Specified Condition
A81-3 (CANH) - A81-9 (CANL)	Cable disconnected from negative (-) battery terminal	1 MΩ or higher

Result

Result
OK
NG

Result:

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to REMOVAL [08/2021 - 09/2022]

Result:

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

CHECK FOR SHORT IN CAN BUS LINES (NO. 6 CAN JUNCTION CONNECTOR)

Reconnect the A81 No. 1 CAN junction connector.
Disconnect the N125 No. 6 CAN junction connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*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
*e	to No. 1 CAN Junction Connector	-	-

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
N125-1 (CANH) - N125-7 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction terminal
N125-3 (CANH) - N125-9 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Blind spot monitor sensor RH*
N125-4 (CANH) - N125-10 (CANL)	Cable disconnected from negative (-) battery terminal	200 Ω or higher	Rear television camera assembly
N125-5 (CANH) - N125-11 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω	No. 1 CAN junction connector

*: w/ Blind Spot Monitor System

Result

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

Result:

REPLACE NO. 6 CAN JUNCTION CONNECTOR

Result:

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

Result:

See step 5

Result:

See step 4

CHECK FOR SHORT IN CAN BUS LINES (NO. 6 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

Disconnect the N105 No. 1 CAN junction terminal connector.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Front view of wire harness connector
(to No. 6 CAN Junction Connector)

to No. 1 CAN Junction Terminal

Standard Resistance

Tester Connection	Condition	Specified Condition
N125-1 (CANH) - N125-7 (CANL)	Cable disconnected from negative (-) battery terminal	1 MΩ or higher

Result

Result
OK
NG

Result:

REPLACE NO. 1 CAN JUNCTION TERMINAL

Result:

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

CHECK FOR SHORT IN CAN BUS LINES (ECU OR SENSOR)

Reconnect all wire harness connectors.
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 [08/2021 - 09/2022]

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G66-23 (CA1H) - G66-8 (CA1L)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

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

Result
OK
NG

Result:

REPLACE ECU OR SENSOR

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR