MIC-Headlamp Switch Input Circuit Open

MIC-HEADLAMP SWITCH INPUT CIRCUIT OPEN

MIC - Headlamp Switch Input Circuit Open:

WHEN MONITORED
With the ignition on

SET CONDITION
The CCN detects an open condition

POSSIBLE CAUSES
- Headlamp switch
- Headlamp switch mux circuit open
- Headlamp switch sense circuit open
- 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 Open?

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.
Connect a jumper between the Headlamp Switch MUX and Sense circuit of the multifunction switch.
With the DRBIII(R), read the headlamp switch voltage.

Q: Does the DRBIII(R) display 0.0 volts?

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

3. HEADLAMP SWITCH MUX CIRCUIT OPEN




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.

Q: Is the resistance below 5.0 ohms?

YES:Go To 4
NO: Repair the Headlamp Switch MUX circuit for an open condition. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. INSTRUMENT CLUSTER




Turn the ignition off
Disconnect the left side Multifunction Switch connector.
Disconnect the Instrument Cluster C2 connector.
Measure the resistance of the Headlamp Switch Sense circuit.

Q: Is the resistance below 5.0 ohms?

YES:Replace the Instrument Cluster. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the Headlamp Switch Sense circuit for an open condition. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test