Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - HEADLAMP SWITCH INPUT CIRCUIT LOW
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Turn the ignition on. With the DRBIII®, clear all BCM DTC's. Turn the headlamps to the ON position. With the DRBIII®, read DTCs. Does the DRBIII® display: HEADLAMP SWITCH INPUT CKT LOW? Yes --> Go To 2 No --> The condition is not present at this time. Monitor DRBIII parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring harness and connector terminals. Perform BODY VERIFICATION TEST - VER 1 . |
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| 2 | Turn the ignition off. Disconnect the Headlamp Switch harness connector. Turn the ignition on. With the DRBIII®, select Body, Body Control Module and read: Headlamp Switch voltage. Does the DRBIII® display Headlamp Switch voltage above 4.8 volts? Yes --> Replace the Headlamp Switch. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 3 |
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| 3 | Turn the ignition off. Disconnect the Body Control Module harness connector. Disconnect the Headlamp Switch harness connector. Measure resistance between the Headlamp Switch Return circuit and the Headlamp Switch MUX circuit. Is the resistance below 5.0 ohms? Yes --> Repair the Headlamp Switch MUX circuit for a short to the Headlamp Switch Return circuit. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 4 |
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| 4 | Turn the ignition off. Disconnect the Body Control Module harness connector. Disconnect the Headlamp Switch harness connector. Measure resistance between ground and the Headlamp Switch MUX circuit. Is the resistance above 5.0 ohms? Yes --> Repair the Headlamp Switch MUX Circuit for a short to ground condition. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 5 |
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| 5 | Turn the ignition off. Disconnect the Body Control Module harness connector. Disconnect the Headlamp Switch harness connector. Measure resistance between ground and the Headlamp Switch Return circuit. Is the resistance below 5.0 ohms? Yes --> Repair the Headlamp Switch Return Circuit for a short to ground condition. Perform BODY VERIFICATION TEST - VER 1 . No --> Replace the Body Control Module. Perform BODY VERIFICATION TEST - VER 1 . |
All |