B1667

B1667-REVERSE LAMP CONTROL CIRCUIT LOW

B1667 - Reverse Lamp Control Circuit Low:

POSSIBLE CAUSES
- (L1) Backup lamps feed circuit
- Reverse lamp
- Integrated power module
- Front control module

Diagnostic Test

1. INTERMITTENT CONDITION

Turn the ignition on.
With the Scan Tool, clear all FCM DTC's.
Turn the Reverse Lamps on.
With the Scan Tool read the DTC information.

Q: Does the Scan Tool read: B1667-REVERSE LAMP 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. REVERSE LAMP

Turn the ignition off.
Inspect the Reverse Lamp assembly for a short condition.

Q: 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. L1 BACKUP LAMPS FEED CIRCUIT






Turn the ignition off.
Disconnect the FCM PDM connector.
Measure the resistance between ground and the (L1) Backup Lamps Feed circuit.

Q: Is the resistance below 5.0 ohms?

YES: Go To 4

NO: Repair the (L1) Backup Lamps 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 from the IPM connector.
Measure the resistance between ground and the (L1) Backup Lamps Feed circuit in the IPM.

Q: 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