B1636-11

B1636-11-RIGHT HIGH BEAM CONTROL - CIRCUIT SHORT TO GROUND





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

Theory of Operation

The Body Control Module (BCM) receives a communication network message from the Steering Column Control Module (SCCM) requesting high beam lamp illumination. When this message is received, the BCM provides a voltage output through the high beam driver circuit. The high beam driver circuit connects to a circuit board internal to the Front Lamp Unit that controls a shutter. The shutter is used for both Halogen and HID Lighting systems. When this shutter is closed, some of the light is blocked resulting in low beam operation. When high beam lamp illumination is requested, the shutter is opened resulting in high beam lamp operation. The high beam driver circuit connects to the shutter control circuit board through a wire harness internal to the Front Lamp Unit. For additional information on the Headlamp operation, Exterior Lamps - Operation.

- When Monitored:
With the high beam headlamps active.

- Set Condition:
When the Body Control Module (BCM) detects a low condition on the (L34) Right High Beam Driver circuit.





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

Does the scan tool display DTC: B1636-11-RIGHT HIGH BEAM CONTROL - CIRCUIT SHORT TO GROUND?

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. ATTEMPT TO SET THE OPPOSITE DTC
1. Turn the ignition off.
2. Disconnect the Right Front Lamp Assembly C1 harness connector.
3. Turn the ignition on.
4. With the scan tool, read DTCs.

Does the scan tool display DTC: B1636-15-RIGHT HIGH BEAM CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN?

Yes

- Replace the Front Lamp Unit. Front Lamp Unit - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK THE (L34) RIGHT HIGH BEAM DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the BCM A harness connector.
3. Measure the resistance between ground and the (L34) Right High Beam Driver circuit.

Is the resistance above 10k Ohms?

Yes

- Replace the BCM. Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the short to ground in the (L34) Right High Beam Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.