B1608

B1608-HEADLAMP SWITCH INPUT CIRCUIT HIGH







- When Monitored:
With the ignition on.

- Set Condition:
The Cluster detects a high condition in the (L307) Headlamp Switch MUX circuit.





1. CHECK FOR ACTIVE DTC
1. Turn the ignition on.
2. Turn the Headlamps on.
3. With the scan tool, read the DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

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.

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




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

Is the voltage above 5.0 volts?

Yes

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

No

- Go To 3

3. HEADLAMP SWITCH




1. Turn the ignition off.
2. Connect a jumper wire to the (L307) Headlamp Switch MUX circuit at the Headlamp Switch harness connector.
3. Turn the ignition on.
4. With the scan tool, read the DTCs.

Does the scan tool display DTC: B1607-HEADLAMP SWITCH INPUT CIRCUIT LOW?

Yes

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

No

- Go To 4

4. (L307) HEADLAMP SWITCH MUX CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Cluster C2 harness connector.
3. Measure the resistance of the (L307) Headlamp Switch MUX circuit.

Is the resistance below 5.0 Ohms?

Yes

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

No

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