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Home >> Jeep >> 2007 >> Liberty Limited, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting Systems - Exterior - Electrical Diagnostics >> Lamps/Lighting - Exterior >> DTC Troubleshooting >> Headlamp Switch Input Circuit High >> Diagnostic Test

Diagnostic Test

  1. 1) INTERMITTENT CONDITION 

    Turn the ignition on.

    With the Scan Tool, erase all BCM DTC's.

    Turn the headlamps to the ON position.

    With the Scan Tool, read DTCs.

    Does the Scan Tool display: HEADLAMP SWITCH INPUT CKT HIGH? 

    Yes 

    1. Go to step  2).

    No 

    1. The condition is not present at this time. Monitor Scan Tool 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.
    2. Perform BODY VERIFICATION TEST .
  2. 2) HEADLAMP SWITCH OPEN 
    Fig 1: Identifying Headlamp Switch Return Circuit And MUX Circuit At Multifunction Switch C1 Harness Connector
    GC0046023Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Multifunction Switch harness connector.

    Connect a jumper wire between the Headlamp Switch MUX circuit and the Headlamp Switch Return circuit in the Multifunction Switch harness connector.

    Turn the ignition on.

    With the Scan Tool, select Body, Body Controller and read: Headlamp Switch volts.

    Does the Scan Tool display Headlamp Switch voltage below 0.5 volts? 

    Yes 

    1. Replace the Headlamp Switch.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to step  3).
  3. 3) HEADLAMP SWITCH MUX CIRCUIT OPEN 
    Fig 2: Measure Resistance Of Headlamp Switch MUX Circuit
    GC0046024Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Body Control Module harness connector.

    Disconnect the Multifunction Switch harness connector.

    Measure resistance of the Headlamp Switch MUX circuit from the Body Control Module connector to the Multifunction Switch harness connector.

    Is the resistance above 5.0 ohms? 

    Yes 

    1. Repair the Headlamp Switch MUX circuit for an open condition.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to step  4).
  4. 4) HEADLAMP SWITCH RETURN CIRCUIT OPEN 
    Fig 3: Measuring Resistance Of Headlamp Switch Return Circuit
    GC0046025Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Body Control Module harness connector.

    Disconnect the Multifunction Switch C1 harness connector.

    Measure resistance of the Headlamp Switch Return circuit from the Body Control Module connector to the Multifunction Switch harness connector.

    Is the resistance above 5.0 ohms? 

    Yes 

    1. Repair the Headlamp Switch Return circuit for an open condition.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Replace the Body Control Module.
    2. Perform BODY VERIFICATION TEST .
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