B1608

B1608-HEADLAMP SWITCH INPUT CIRCUIT HIGH





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






1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. Turn the Headlamps on.
3. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 3

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. (L307) HEADLAMP SWITCH MUX CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the Headlamp Switch harness connector.
3. Disconnect the Cluster C1 harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (L307) Headlamp Switch MUX circuit.

Is voltage present?

Yes

- Repair the short to voltage in the (L307) Headlamp Switch MUX circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. HEADLAMP SWITCH
1. Turn the ignition off.
2. Reconnect the Cluster C1 harness connector.
3. Connect a fused jumper wire between the (L307) Headlamp Switch MUX circuit and the (L900) Headlamp Switch MUX Return circuit in the Headlamp Switch harness connector.
4. Turn the ignition on.
5. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 4

No

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

4. (L307) HEADLAMP SWITCH MUX CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Cluster C1 harness connector.
3. Measure the resistance of the (L307) Headlamp Switch MUX circuit.

Is the resistance above 10.0 Ohms?

Yes

- Repair the open in the (L307) Headlamp Switch MUX circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. (L900) HEADLAMP SWITCH MUX RETURN CIRCUIT OPEN




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

Is the resistance above 10.0 Ohms?

Yes

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

No

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