Diagnostic Procedure

4WD INDICATOR INOPERATIVE - DIAGNOSTIC PROCEDURE

TEST	ACTION	APPLICABILITY
1	Is vehicle equipped with the optional Off-Road Package? Yes : Go To 2 No : Go To 6	All
2	Perform the Instrument Cluster self-test. Turn the ignition off. Press and hold the Trip Reset button. Turn the ignition on. Observe the 4WD indicator during the self-test. NOTE: The Instrument Cluster self-test can be initiated using the DRBIII®. Did the 4WD indicator illuminate during the self-test? Yes : Go To 3 No : Replace and configure the Instrument Cluster in accordance with the Service Information. Perform BODY VERIFICATION TEST .	All
3	Turn the ignition on, Transfer Case Shift Lever in 2H. With the DRBIII® in Inputs/Outputs, read the 4WD Switch state. Place the Transfer Case Shift Lever in 4H or 4L while observing the 4WD Switch State. Did the Does the DRBIII® display 4H or 4L? Yes : The condition is not present at this time. Monitor DRBIII® parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness and connector terminals. Perform BODY VERIFICATION TEST . No : Go To 4	All
4	Turn the ignition off. Disconnect the Transfer Case Switch harness connector. Connect a jumper wire between cavity 1 and cavity 2. Turn the ignition on. With the DRBIII®, read the 4WD Switch input. Does the DRBIII® display "Closed?" Yes : Replace the Transfer Case Switch in accordance with the Service Information. Perform BODY VERIFICATION TEST . No : Go To 5	All
5	Turn the ignition off. Disconnect the Transfer Case Switch harness connector. Disconnect the PCM C1 harness connector. Measure the resistance of the Transfer Case Position Sensor Input circuit between the T/Case Switch connector and the PCM C1 connector. Is the resistance above 5.0 ohms? Yes : Repair the Transfer Case Position Sensor Input circuit for an open. Perform BODY VERIFICATION TEST . No : Repair the Transfer Case Switch Ground circuit for an open. Perform BODY VERIFICATION TEST .	All
6	Turn the ignition on. With the DRBIII®, select Body, MIC, then Inputs/Outputs. Move the transfer case shift lever from the 2H to the 4H or 4L position. Does the DRBIII® display 4WD Switch "Closed" with the shift lever in the 4H or 4L position? Yes : Replace and configure the Instrument Cluster in accordance with the Service Information. Perform BODY VERIFICATION TEST . No : Go To 7	All
7	Turn the ignition off. Disconnect the Transfer Case Switch harness connector. Connect a jumper wire between cavity A and cavity B. Turn the ignition on. With the DRBIII®, read the 4WD Switch input. Does the DRBIII® display "Closed". Yes : Replace the Transfer Case Switch in accordance with the Service Information. Perform BODY VERIFICATION TEST . No : Go To 8	All
8	Turn the ignition off. Disconnect the Transfer Case Switch harness connector. Connect a jumper wire between the 4WD Indicator circuit and ground. Turn the ignition on. With the DRBIII®, read the 4WD Switch state. Does the DRBIII® display "Closed"? Yes : Go To 9 No : Repair the 4WD Indicator circuit for an open. Perform BODY VERIFICATION TEST .	All
9	Turn the ignition off. Disconnect the Transfer Case Switch harness connector. Measure the resistance between ground and the Transfer Case Switch Ground circuit. Is the resistance below 5.0 ohms? Yes : The condition is not present at this time. Monitor DRBIII® parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness and connector terminals. Perform BODY VERIFICATION TEST . No : Repair the Transfer Case Switch Ground circuit for an open. Perform BODY VERIFICATION TEST .	All