B163A-11

B163A-11-FRONT LEFT TURN LAMP 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 turn signal lamp illumination. When this bus message is received, the BCM provides a pulsed voltage output through the front turn signal driver circuit. The front turn signal driver circuit connects to the Turn Signal Lamp. For additional information on the Turn Signal Lamps operation, Exterior Lamps - Operation.

- When Monitored:
With the turn signal active.

- Set Condition:
When the Body Control Module (BCM) detects a low condition on the (L61) Left Front Turn Signal Driver circuit.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Turn the Left Turn Signal on.
4. With the scan tool, read DTCs.

Does the scan tool display DTC: B163A-11-FRONT LEFT TURN LAMP 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 Left Turn Signal off.
2. Turn the ignition off.
3. Disconnect the Left Front Lamp Assembly C1 harness connector.
4. Turn the ignition on.
5. Turn the Left Turn Signal on.
6. With the scan tool, read DTCs.

Does the scan tool display DTC: B163A-15-FRONT LEFT TURN LAMP CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN?

Yes

- Replace the Left Turn Signal Bulb. Front Lamp Unit - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK THE (L61) LEFT FRONT TURN SIGNAL DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the BCM D harness connector.
3. Measure the resistance between ground and the (L61) Left Front Turn Signal 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 (L61) Left Front Turn Signal Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.