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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 Low >> Notes

Headlamp Switch Input Circuit Low: Notes

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS article.

  1. When Monitored: 

    Ignition on.

  2. Set Condition: 

    BCM detects a voltage less than 0.25 volts on the Headlamp Switch Input for more than 5 seconds.

Possible Causes 
HEADLAMP SWITCH SHORTED
HEADLAMP SWITCH MUX CIRCUIT SHORT TO RETURN CIRCUIT
HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND
HEADLAMP SWITCH RETURN CIRCUIT SHORT TO GROUND
BODY CONTROL MODULE