Possible Causes

circuit (GY) open, short to voltage, or short to ground
circuit (LB/B) open, short to voltage, or short to ground
4WD control module
instrument cluster
CAUTION:
- Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

4WD AND 4WD LOW INDICATOR NEVER/ALWAYS ON PINPOINT TEST REFERENCE

PINPOINT TEST 19		4WD AND 4WD LOW INDICATOR IS NEVER/ALWAYS ON
STEP	INSPECTION		ACTION
1	DETERMINE THE CONDITION Key ON. Observe the 4WD indicators. Is a 4WD indicator always on?	Yes	Go to next step.
1		No	Go to step 4.
2	CHECK THE 4WD CONTROL MODULE FOR OPERATION Key OFF. Disconnect: 4WD control module 0318-03. Observe the 4WD indicator. Key ON. Does the 4WD indicator turn off?	Yes	Go to step 9.
2		No	Go to next step.
3	CHECK CIRCUITS (GY) AND (LB/B) FOR A SHORT TO GROUND Key OFF. Disconnect: Instrument cluster 0922-102. Measure the resistance between the instrument cluster 0922-102 pin 18, circuit (LB/B), harness side and ground; and between the instrument cluster 0922-102 pin 17, circuit (GY), harness side and ground. Are the resistances greater than 10,000 ohms?	Yes	Go to step 10.
3		No	Repair circuit (GY) and (LB/B) for a short to ground. Test the system for normal operation.
4	CHECK THE FOUR WHEEL DRIVE (4WD) OPERATION Verify the operation of the 4WD function. Does the 4WD function correctly?	Yes	If 4WD LOW indicator, go to step 7. If 4WD indicator, go to next step.
4		No	See TRANSFER CASE ELECTRONIC SHIFT ON - BOARD DIAGNOSIS to continue diagnosis of the 4WD system.
5	CHECK THE 4WD HIGH INDICATOR OPERATION Key OFF. Disconnect: 4WD module 0318-03. NOTE: If the fuse fails, repair the circuit for a short to voltage. Connect a fused (5A) jumper wire between the 4WD module 0318-03 pin 6, circuit (GY), harness side and ground. Key ON. Does the 4WD HIGH indicator illuminate?	Yes	Go to step 9.
5		No	Go to next step.
6	CHECK CIRCUIT (GY) FOR AN OPEN Key OFF. Disconnect: Instrument cluster 0922-102. Measure the resistance between the 4WD module 0318-03 pin 6, circuit (GY), harness side and the instrument cluster 0922-102 pin 17, circuit (GY), harness side. Is the resistance less than 5 ohms?	Yes	Go to step 10.
6		No	Repair circuit (GY) for an open. Test the system for normal operation.
7	CHECK THE 4WD LOW INDICATOR OPERATION Key OFF. Disconnect: 4WD module 0318-03. NOTE: If the fuse fails, repair the circuit for a short to voltage. Connect a fused (5A) jumper wire between the 4WD module C281b pin 9, circuit (LB/B), harness side and ground. Key ON. Does the 4WD LOW indicator illuminate?	Yes	Go to step 9.
7		No	Go to next step.
8	CHECK CIRCUIT (LB/B) FOR AN OPEN Key OFF. Disconnect: Instrument cluster 0922-102. Measure the resistance between the 4WD module 0318-03 pin 9, circuit (LB/B), harness side and the instrument cluster 0922-102 pin 18, circuit (LB/B), harness side. Is the resistance less than 5 ohms?	Yes	Go to step 10.
8		No	Repair circuit (LB/B) for an open. Test the system for normal operation.
9	CHECK FOR CORRECT 4WD MODULE OPERATION Disconnect all the 4WD module connectors. Check for: Corrosion pushed-out pins Connect all the 4WD 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 module. See 4WD CONTROL MODULE REMOVAL / INSTALLATION . Test the system for normal operation.
9		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
10	CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: Corrosion pushed-out pins Operate the system and verify the concern is still present. Is the concern still present?	Yes	Install a new instrument cluster. See INSTRUMENT CLUSTER . Test the system for normal operation.
10		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.