B1607

B1607-HEADLAMP SWITCH INPUT CIRCUIT LOW





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.






1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the Scan Tool, clear all CCN DTCs.
3. Turn the Headlamps on.
4. With the Scan Tool, read the DTC information.

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. Body Verification Test.

2. HEADLAMP SWITCH
1. Disconnect the Headlamp Switch harness connector.
2. Turn the ignition on.
3. Measure the voltage of the (L900) Headlamp Switch MUX Return circuit.

Does the voltage read 5.0 volts?

Yes

- Go To 3
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Headlamp Switch.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. (L900) HEADLAMP SWITCH MUX RETURN CIRCUIT




1. Turn the ignition off.
2. Disconnect the Headlamp Switch connector.
3. Disconnect the Instrument Cluster C2 harness connector.
4. Measure the resistance of the (L900) Headlamp Switch MUX Return circuit to ground.

Is the resistance below 5.0 Ohms?

Yes

- Repair the open in the (L900) Headlamp Switch MUX return circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Instrument Cluster.
- Perform the BODY VERIFICATION TEST. Body Verification Test.