B1608

B1608-HEADLAMP SWITCH INPUT CIRCUIT HIGH





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: B1608-HEADLAMP SWITCH INPUT CIRCUIT HIGH?

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. Using the Scan Tool measure the Headlamp switch voltage.

Does the voltage read 5.0 volts?

Yes

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

No

- Go To 3

3. (L116) HEADLAMP SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the Headlamp Switch connector.
3. Disconnect the Instrument Cluster C4 connector.
4. Turn the ignition on.
5. Measure for voltage on the (L116) Headlamp Switch Signal circuit.

Is the voltage above 5.0 volts?

Yes

- Repair short to voltage on the (L116) Headlamp Switch Signal circuit.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

- Go To 4

4. INSTRUMENT CLUSTER




1. Turn the ignition off.
2. Disconnect the Headlamp Switch connector.
3. Disconnect the Instrument Cluster C4 connector.
4. Measure the resistance of the (L116) Headlamp Switch Signal circuit.

Is the resistance below 5.0 ohms?

Yes

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

No

- Repair open in the (L116) Headlamp Switch Signal circuit.
- Perform the BODY VERIFICATION TEST Body Verification Test.