B1644
1644-REAR LEFT TURN CONTROL CIRCUIT HIGHB1644-Rear Left Turn Control Circuit High:
WHEN MONITORED
Continuously
SET CONDITION
When the Front Control Module detects a short to battery on the Control circuit.
POSSIBLE CAUSES
- (L63) turn signal control circuit
- Power distribution center
- Front control module
DIAGNOSTIC TEST
1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
Clear all FCM DTC's
Turn the Left Turn Signal on.
With the scan tool, read DTC's.
Q: Does the scan tool read: B1644-REAR LEFT TURN CONTROL CIRCUIT HIGH?
YES: Go To 2
NO: The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
2. L63 LEFT TURN SIGNAL CONTROL CIRCUIT
Turn the ignition off.
Disconnect the PDM connector from the FCM.
Measure the resistance of the (L63) Left Rear Turn Signal Control circuit.
Q: Is the resistance above 5.0 ohms?
NO: Repair the (L63) Turn Signal Control circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
YES: Go To 3
3. FRONT CONTROL MODULE
Turn the ignition off.
Disconnect the Front Control Module from the PDM 49 way connector.
Measure the voltage between (L63) Left Rear Turn Signal Control circuit and ground.
Q: Is there any voltage present?
YES: Replace the Power Distribution Center. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Front Control Module. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test