Check Bus 4 Line for Short to +B [11/2018 - 02/2019]: Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 CAN JUNCTION CONNECTOR)

Disconnect the cable from the negative (-) auxiliary battery terminal.

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	-	-

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
G96-9 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	No. 4 CAN junction connector
G96-20 (CANL) - G114-16 (BAT)		6 kΩ or higher	No. 4 CAN junction connector
G96-10 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	No. 6 CAN junction connector
G96-21 (CANL) - G114-16 (BAT)		6 kΩ or higher	No. 6 CAN junction connector
G96-11 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Steering sensor
G96-22 (CANL) - G114-16 (BAT)		6 kΩ or higher	Steering sensor

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:

REPLACE NO. 1 CAN JUNCTION CONNECTOR

Result:

See step 4

Result:

See step 5

Result:

See step 2

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 6 CAN JUNCTION CONNECTOR)

Reconnect the G96 No. 1 CAN junction connector.

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 Central Gateway ECU (Network Gateway ECU)
*c	to No. 1 CAN Junction Connector	*d	to Parking Brake ECU Assembly
*e	Front view of DLC3	-	-

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
M31-3 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Central gateway ECU (network gateway ECU)
M31-9 (CANL) - G114-16 (BAT)		6 kΩ or higher	Central gateway ECU (network gateway ECU)
M31-4 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	No. 1 CAN junction connector
M31-10 (CANL) - G114-16 (BAT)		6 kΩ or higher	No. 1 CAN junction connector
M31-5 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Parking brake ECU assembly
M31-11 (CANL) - G114-16 (BAT)		6 kΩ or higher	Parking brake ECU assembly

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:

REPLACE NO. 6 CAN JUNCTION CONNECTOR

Result:

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

Result:

See step 5

Result:

See step 3

CHECK SHORT TO +B IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR)

Reconnect the M31 No. 6 CAN junction connector.

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G72-22 (CA2H) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
G72-7 (CA2L) - G114-16 (BAT)		6 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

Refer to REMOVAL [11/2018 - 02/2019]

Result:

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

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR)

Reconnect the G96 No. 1 CAN junction connector.

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 (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

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

Standard Resistance

Tester Connection	Condition	Specified Condition	Connected to
G104-1 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Brake booster with master cylinder assembly (skid control ECU)
G104-7 (CANL) - G114-16 (BAT)		6 kΩ or higher
G104-2 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Airbag ECU assembly
G104-8 (CANL) - G114-16 (BAT)		6 kΩ or higher	Airbag ECU assembly
G104-3 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Hybrid vehicle control ECU assembly
G104-9 (CANL) - G114-16 (BAT)		6 kΩ or higher	Hybrid vehicle control ECU assembly
G104-4 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	No. 1 CAN junction connector
G104-10 (CANL) - G114-16 (BAT)		6 kΩ or higher	No. 1 CAN junction connector
G104-5 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Rack and pinion power steering gear assembly
G104-11 (CANL) - G114-16 (BAT)		6 kΩ or higher	Rack and pinion power steering gear assembly
G104-6 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	ECM
G104-12 (CANL) - G114-16 (BAT)		6 kΩ or higher	ECM

Result

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

Result:

REPLACE NO. 4 CAN JUNCTION CONNECTOR

Result:

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

Result:

See step 5

CHECK FOR SHORT TO +B IN CAN BUS WIRE (ECU, SENSOR)

Reconnect the CAN junction connector.

Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short to +B is connected.

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

Refer to TERMINALS OF ECU [11/2018 - 02/2019]

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G72-22 (CA2H) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
G72-7 (CA2L) - G114-16 (BAT)		6 kΩ or higher

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:

REPAIR ECU OR SENSOR

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR