B1643-REAR LEFT TURN CONTROL CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
- With the Turn Signal activated.
- Set Condition:
- When the FCM detects a LOW condition.
| Possible Causes |
| (L63) REAR LEFT TURN SIGNAL CONTROL CIRCUIT |
| POWER DISTRIBUTION CENTER |
| FRONT CONTROL MODULE |
Diagnostic Test
1. INTERMITTENT CONDITIONTurn 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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
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 in accordance with the service information.
- Perform the BODY VERIFICATION TEST-VER1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Front Control Module in accordance with the service information.
- Perform the BODY VERIFICATION TEST-VER1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)