B1634

B1634-LEFT HI BEAM CONTROL CIRCUIT HIGH





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

- When Monitored:
With the Headlamps active.

- Set Condition:
When the Front Control Module (FCM) detects a high condition.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all FCM DTCs.
3. Turn the Headlamps on.
4. With the scan tool, read the DTC information.

Does the scan tool display B1634-LEFT HI BEAM CONTROL CIRCUIT HIGH?

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

2. LEFT HIGH BEAM BULB
1. Turn the ignition off.
2. Inspect the Left High Beam Bulb Assembly.

Is the inoperative bulb OK?

Yes

- Go To 3

No

- Replace the inoperative bulb.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. (L33) HIGH BEAM CONTROL CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the FCM C2 harness connector.
3. Measure the resistance of the (L33) High Beam Control circuit.

Is the resistance above 5.0 Ohms?

Yes

- Repair the open in the (L33) High Beam Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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