B1643

B1643-REAR LEFT TURN CONTROL CIRCUIT LOW





For a complete wiring diagram Refer to Diagrams/Electrical.





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.LEFT REAR TURN SIGNAL BULB

Turn the ignition off.

Inspect the Left Rear Turn Signal Bulb assembly for a short condition.

Is the inoperative bulb OK?

Yes

- Go To 3

No

- Replace the inoperative bulb.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

3.L63 REAR LEFT TURN SIGNAL CONTROL CIRCUIT





Turn the ignition off.

Disconnect the FCM PDM connector.

Measure the resistance between ground and the (L63) Rear Left Turn Signal Control circuit.

Is the resistance below 5.0 ohms?

Yes

- Go To 4

No

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

4.FRONT CONTROL MODULE

Turn the ignition off.

Disconnect the FCM connector.

Disconnect the PDM connector.

Measure the resistance between ground and the (L63) Rear Left Turn Signal Control circuit in the PDM.

Is the resistance below 5.0 ohms?

Yes

- Replace the Module 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