4WD Control ECU Communication Stop Mode

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: 4WD Control ECU Communication Stop Mode

4WD Control ECU Communication Stop Mode

DESCRIPTION

HINT: For vehicle with 4WD only.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTICE:
- Turn the ignition switch OFF before measuring the resistances of the main wire and the branch wire.
- After the ignition switch is turned OFF, check that the key reminder warning system and light reminder warning system are not in operation.
- Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition switch, any switches or doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
HINT: Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1. CHECK CAN BUS LINE FOR DISCONNECTION (4WD CONTROL ECU BRANCH WIRE)

(a) Disconnect the E57 4WD control ECU connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO 4WD CONTROL ECU (CANH, CANL)
OK -- Continue to next step.
2. CHECK WIRE HARNESS (4WD CONTROL ECU - BATTERY AND BODY GROUND)

(a) Disconnect the E57 4WD control ECU connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE 4WD CONTROL ECU