B1607
B1607-HEADLAMP SWITCH INPUT CIRCUIT LOWB1607-Headlamp Switch Input Circuit Low:
WHEN MONITORED
SET CONDITION
POSSIBLE CAUSES
- Headlamp switch
- (L900) mux return circuit
- Instrument cluster
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
DIAGNOSTIC TEST
1. INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all CCN DTC's.
Turn the Headlamps on.
With the Scan Tool, read the DTC information.
Q: Does the Scan Tool read: B1607-HEADLAMP SWITCH INPUT CIRCUIT LOW?
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 the BODY VERIFICATION TEST - VER 1. Body Verification Test
2. HEADLAMP SWITCH
Disconnect the Headlamp Switch connector.
Turn the ignition on.
Measure the voltage of the (L900) MUX Return circuit.
Q: Does the voltage read 5.0 volts?
YES: Go To 3 Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Headlamp Switch. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
3. (L900) MUX RETURN CIRCUIT
Turn the ignition off.
Disconnect the Headlamp Switch connector.
Disconnect the Instrument Cluster C2 connector.
Measure the resistance of the (L900) MUX Return circuit to ground.
Q: Is the resistance below 5.0 ohms?
YES: Repair the (L900) Headlamp MUX return circuit. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Instrument Cluster. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test