Symptom:
MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED
POSSIBLE CAUSES
INTERMITTENT CONDITION
HEADLAMP SWITCH
HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND
INSTRUMENT CLUSTER
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, clear all MIC DTC’s.
Turn the Headlamps on.
With the DRBIIIt, read the DTC information.
Does the DRBIIIt read: Headlamp Switch Input Circuit Short?
All
Yes → Go To 2
No → The condition that caused the symptom is currently not present.
Inspect the related wiring for a possible intermittent condition.
Look for any chafed, pierced, pinched, or partially broken wires.
Perform BODY VERIFICATION TEST - VER 1.
2 Disconnect the Headlamp Switch connector.
Turn the ignition on.
Does the DRBIIIt display Headlamp Switch 5.0 volts?
All
Yes → Go To 3
No → Replace the Headlamp Switch.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Disconnect the Headlamp Switch connector.
Disconnect the instrument cluster C3 connector.
Measure the resistance of the Headlamp Switch MUX circuit to ground.
Is the resistance below 5.0 ohms?
All
Yes → Repair the Headlamp Switch MUX circuit for a short to ground
condition.
Perform BODY VERIFICATION TEST - VER 1.
No → Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
359
EXTERIOR LIGHTING
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