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Possible Causes

ISO 9141 communication network circuit (LB/W) open
4WD control module 0318-02
4WD control module

CAUTION:

Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

FOUR-WHEEL DRIVE (4WD) CONTROL MODULE DOES NOT RESPOND TO DIAGNOSTIC TOOL PINPOINT TEST REFERENCE

PIN POINT TEST 4		FOUR-WHEEL DRIVE (4WD) CONTROL MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL
STEP	INSPECTION		ACTION
1	CHECK THE 4WD CONTROL MODULE 0318-02 FOR DAMAGE Key OFF. Disconnect: 4WD control module 0318-02. Inspect the 4WD control module 0318-02 for damage. Is the 4WD control module 0318-02 OK?	Yes	Go to next step.
1		No	Repair the 4WD control module 0318-02. Carry out the WDS or equivalent tester data link test.
2	CHECK THE ISO 9141 CIRCUIT BETWEEN THE DLC AND THE 4WD CONTROL MODULE FOR AN OPEN Measure the resistance between the 4WD control module 0318-02 pin 4, circuit (LB/W), harness side and the DLC D-01 pin 7, circuit (LB/W), harness side. Is the resistance less than 5 ohms?	Yes	Go to next step.
2		No	Repair circuit (LB/W) for an open. Connect the 4WD control module 0318-02. Carry out the WDS or equivalent tester data link test.
3	CHECK FOR CORRECT 4WD CONTROL MODULE OPERATION Disconnect all the 4WD control module connectors. Check for: corrosion pushed-out pins Connect all the 4WD control module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	Install a new 4WD control module. See 4WD CONTROL MODULE REMOVAL / INSTALLATION . Carry out the WDS or equivalent tester data link test.
3		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. Clear the diagnostic trouble codes (DTCs). Repeat the self-test. Carry out the WDS or equivalent tester data link test.