B1643

B1643-REAR LEFT TURN CONTROL CIRCUIT LOW





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
- With the Turn Signal activated.
- Set Condition:
- When the FCM detects a LOW condition.





Diagnostic Test

1. INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all FCM DTC's.
Turn the Left Turn Signals on.
With the Scan Tool read the DTC information.
Does the Scan Tool read: 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-VER1. Body Verification Test

2. L63 LEFT TURN SIGNAL CONTROL CIRCUIT




Turn the ignition off.
Disconnect the IPM C2 connector.
Disconnect the Left Rear Tail Lamp connector.
Measure the resistance between ground and the (L63) Rear Left Turn Signal Control circuit.
Is the resistance below 5.0 ohms?

Yes

- Repair the (L63) Rear Left Turn Signal Control circuit for a short to ground.
- Perform the BODY VERIFICATION TEST-VER1. Body Verification Test

No

- Go To 3

3. FRONT CONTROL MODULE




Turn the ignition off.
Disconnect the Front Control Module from the IPM 49-way connector.
Measure the resistance between ground and the (L63) Left Turn Signal Control circuit in the PDC.
Is the resistance below 5.0 ohms?

Yes

- Replace the Power Distribution Center.
- Perform the BODY VERIFICATION TEST-VER1. Body Verification Test

No

- Replace the Front Control Module.
- Perform the BODY VERIFICATION TEST-VER1. Body Verification Test