B1634

B1634-LEFT HIGH BEAM CONTROL CIRCUIT HIGH





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

- When Monitored:
With the headlamps activated.

- Set Condition:
When the Front Control Module (FCM) detects a high condition in the left high beam control circuit.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all FCM DTCs.
3. Turn the high beam headlamps on.
4. With the scan tool read the DTCs.

Does the Scan Tool read: B1634-LEFT HIGH BEAM CONTROL 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. (L33) LEFT HIGH BEAM DRIVER CIRCUIT OPEN




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

Is the resistance above 5.0 Ohms?

Yes

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

No

- Go To 3

3. (L33) LEFT HIGH BEAM DRIVER CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition on.
2. Measure the voltage on the (L33) Left High Beam Driver circuit.

Is there any voltage present?

Yes

- Repair the short to voltage in the (L33) Left High Beam Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Front Control Module (FCM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.