MIC-Headlamp Switch Input Circuit Shorted

MIC-HEADLAMP SWITCH INPUT CIRCUIT SHORTED

MIC - Headlamp Switch Input Circuit Shorted:

WHEN MONITORED
With the ignition on

SET CONDITION
The CCN detects a short to ground condition

POSSIBLE CAUSES
- Headlamp switch
- Headlamp switch mux circuit short to ground
- Instrument cluster

1. INTERMITTENT CONDITION




Turn the ignition on.
With the DRBIII(R), clear all MIC DTC's.
Turn the Headlamps on.
With the DRBIII(R), read the DTC information.

Q: Does the DRBIII(R) read: Headlamp Switch Input Circuit Short?

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. Body Verification Test

2. HEADLAMP SWITCH
Disconnect the Headlamp Switch connector.
Turn the ignition on.

Q: Does the DRBIII(R) display Headlamp Switch 5.0 volts?

YES: Go To 3
NO: Replace the Headlamp Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND




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.

Q: Is the resistance below 5.0 ohms?

YES: Repair the Headlamp Switch MUX circuit for a short to ground condition. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Instrument Cluster. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test