B1643

B1643-REAR LEFT TURN CONTROL CIRCUIT LOW





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

- When Monitored:
With the Turn Signal active.

- Set Condition:
When the Totally Integrated Power Module (TIPM) detects a low condition in the left rear turn lamp driver circuit.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, erase all TIPM DTCs.
3. Turn the Left Turn Signals on.
4. With the scan tool, read the DTCs.

Does the scan tool display DTC B1643-REAR LEFT TURN CONTROL CIRCUIT LOW?

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. (L63) LEFT REAR TURN LAMP DRIVER CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the TIPM C7 harness connector.
3. Disconnect the Left Tail Lamp Assembly harness connector.
4. Measure the resistance between ground and the (L63) Left Rear Turn Lamp Driver circuit.

Is the resistance above 10k Ohms?

Yes

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

No

- Repair the short to ground in the (L63) Left Rear Turn Lamp Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.