Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Identify the connector to be checked by its color of the wire and shape of the junction on the CAN J/C because the locations of the connectors to the CAN J/C are confusing.

CHECK CAN BUS WIRE FOR SHORT CIRCUIT (DLC3 BRANCH WIRE)

Turn the ignition switch to the LOCK position.
Disconnect the DLC3 branch wire connector (J25) from the wiring harness connector (CAN J/C1).

Fig 1: Identifying DLC3 Branch Wire Connector (J25)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value in the table below.

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester connection	Condition	Specified value
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	1 MΩ or higher

Fig 2: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE DLC3 BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)

OK: Go to Next Step

CHECK CAN BUS WIRE FOR SHORT CIRCUIT

Reconnect the DLC3 branch wire connector (J25) to the wiring harness connector (CAN J/C1).

Fig 3: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect the probes of an ohmmeter to terminals 6 (CANH) and 14 (CANL) of the DLC3.

While observing the resistance value shown on the tester, disconnect connectors J22, J23, J26, J49, J50 (*1), and J51 from the CAN J/C1 one by one until the resistance becomes normal (between 54 and 69 Ω).

Fig 4: Identifying CAN Bus Wire Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Identifying CAN J/C1 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CAN J/C1 CONNECTOR REFERENCE (A SIDE)

CAN J/C1 connectors (A side, with earth wire)	Code	Color (CAN-H Side)	Color (CAN-L Side)
Skid control ECU	J22	L	W
Steering angle sensor	J23	L	W
ECM	J49	L	W
Distance control ECU (*1)	J50	G	W
HINT: (*1): with dynamic laser cruise control system

CAN J/C1 CONNECTOR REFERENCE (B SIDE)

CAN J/C1 connectors (B side, without earth wire)	Code	Color (CAN-H Side)	Color (CAN-L Side)
DLC3	J25	B	W
Yaw rate sensor	J26	L	W
CAN main bus wire (bus wire to connect CAN J/C1 and CAN J/C2)	J27	GR	W
Gateway ECU	J51	GR	G

NOTE: Do not reconnect the disconnected connectors until this inspection is complete because there may be a short in 2 or more branch wires.

Result

RESULT TABLE

Symptom	Proceed to
The resistance is still below 54 Ω when all the specified connectors are disconnected. (There are no shorts in the branch wires.)	A
The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected. (There is a short in one or more of the branch wires.)	B

When there is a short in one or more of the branch wires:
1. Reconnect all of the connectors to the CAN J/G, except for the one that was disconnected last (the short-circuited bus wire). Check that the resistance shown on the tester is normal (between 54 and 69 Ω) to confirm that there is a short in the one branch wire only.
  HINT:
  - The connectors connected to the CAN J/C can be distinguished according to the color of the communication bus wires and the shape of the connectors.
  - Reconnecting the connectors to non-specified positions on the CAN J/C does not affect system operation. However, it is preferred to reconnect the connectors to their specified positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.

B: Go to step 5

A: Go to Next Step

CHECK CAN BUS WIRE FOR SHORT CIRCUIT (CAN MAIN BUS WIRE)

Disconnect the CAN main bus wire connector (J27) from the wiring harness connector (CAN J/C1).

Fig 6: Identifying CAN Main Bus Wire Connector (J27)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value in the table below.

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester connection	Condition	Specified value
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	108 to 132 Ω

Fig 7: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE WIRING HARNESS CONNECTOR (CAN J/C1)

OK: Go to Next Step

CHECK CAN BUS WIRE FOR SHORT CIRCUIT (CAN MAIN BUS WIRE)

Disconnect the CAN main bus wire connector (J43) from the wiring harness connector (CAN J/C2).

Fig 8: Identifying J43 CAN J/C2 Connector Terminals

Measure the resistance according to the value in the table below.

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester connection	Condition	Specified value
J43-1 (CANH) - J43-2 (CANL)	Ignition switch off	1 MΩ or higher

HINT:

Confirm disconnection of the CAN main bus wire from the wiring harness connector (CAN J/C1) during measurement.

NG: REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)

OK: REPLACE WIRING HARNESS CONNECTOR (CAN J/C2)

CHECK CAN BUS WIRE FOR SHORT CIRCUIT

Reconnect the connector for the short-circuited branch wire to the CAN J/C (the connector that caused the bus wire resistance to become normal (between 54 and 69 Ω) when it was disconnected).
Disconnect the connector that includes terminals CANH and CANL from the ECU (or sensor) to which the short-circuited branch wire is connected. (See TERMINALS OF ECU )

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

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester connection	Condition	Specified value
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Fig 9: Identifying DLC3 Connector Terminals

NG: REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH WIRE OR CONNECTOR

OK: REPLACE CORRESPONDING ECU OR SENSOR