B163B

B163B-FRONT LEFT TURN LAMP CONTROL CIRCUIT LOW





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

Theory of Operation

The Totally Integrated Power Module (TIPM) receives a bus message requesting turn signal lamp illumination. When this bus message is received, the TIPM provides a pulsed voltage output through the front turn signal control circuit. The front turn signal control circuit connects to the dual filament Park and Turn Signal Lamp. The same ground circuit is used for both the Park and Turn Signal filaments in a dual filament lamp. For additional information on the Turn Signal Lamps operation, Exterior Lamps - Operation.

- When Monitored:
With the turn signal active.

- Set Condition:
When the Totally Integrated Power Module (TIPM) detects a low condition on the (L161) Left Front Turn Signal Control 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: B163B-FRONT LEFT TURN LAMP CONTROL CIRCUIT LOW?

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 Park/Turn Lamp 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: B163C-FRONT LEFT TURN LAMP CONTROL CIRCUIT HIGH?

Yes

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

No

- Go To 3

3. CHECK THE (L161) LEFT FRONT TURN SIGNAL CONTROL CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the TIPM C4 harness connector.
3. Measure the resistance between ground and the (L161) Left Front Turn Signal Control circuit.

Is the resistance above 10k Ohms?

Yes

- Replace the Totally Integrated Power Module (TIPM). Totally Integrated Power Module (TIPM) - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the short to ground in the (L161) Left Front Turn Signal Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.