Diagnostic Procedure
DIAGNOSTIC INFORMATION AND PROCEDURES CHART (4WD INDICATOR INOPERATIVE)
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Is vehicle equipped with the optional Off-Road Package? Yes --> Go To 2 No --> Go To 6 |
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| 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 - VER 1 . |
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| 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 (TSBs) that may apply. Visually inspect the related wiring harness and connector terminals. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 4 |
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| 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 - VER 1 . No --> Go To 5 |
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| 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 - VER 1 . No --> Repair the Transfer Case Switch Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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| 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 - VER 1 . No --> Go To 7 |
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| 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 - VER 1 . No --> Go To 8 |
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| 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 - VER 1 . |
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| 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 (TSBs) that may apply. Visually inspect the related wiring harness and connector terminals. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Transfer Case Switch Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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