Symptom:
MIC-HEADLAMP SWITCH INPUT CIRCUIT OPEN
POSSIBLE CAUSES
INTERMITTENT CONDITION
HEADLAMP SWITCH
HEADLAMP SWITCH MUX CIRCUIT OPEN
INSTRUMENT CLUSTER
HEADLAMP SWITCH SENSE CIRCUIT OPEN
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 Open?
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.
Connect a jumper between the Headlamp Switch MUX and Sense circuit of the
multifunction switch.
With the DRBIIIt, read the headlamp switch voltage.
Does the DRBIIIt display 0.0 volts?
All
Yes → Replace the Headlamp Switch.
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 3
3 Turn the ignition off.
Disconnect the left side multifunction switch connector.
Disconnect the instrument cluster C2 connector.
Measure the resistance of the Headlamp Switch MUX circuit.
Is the resistance below 5.0 ohms?
All
Yes → Go To 4
No → Repair the Headlamp Switch MUX circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1.
357
EXTERIOR LIGHTING
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