Park Lamps Malfunction
Park Lamps Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Circuit/System Description
The park, tail, and marker lamps, including the license lamps, are turned ON when the headlamp switch is placed in the PARK or HEADLAMP position, or anytime the headlights are requested. The PARK LAMPS fuse in the rear fuse block supplies battery positive voltage to the PARK LAMP relay switch contacts. The PARK LAMPS fuse in the rear fuse block also supplies battery positive voltage to the PARK LAMP relay coil. When the park lamps are turned ON, the body control module (BCM) energizes the park lamp relay. Current flow is from the PARK LAMP relay to their respective park and marker lamps and to ground. Ground is provided at G101, G102, G401, and G403.
Reference Information
Schematic Reference
Exterior Lights Schematics (Exterior Lights Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Exterior Lighting Systems Description and Operation (Exterior Lighting Systems Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, command the park lamps ON and OFF with a scan tool. The park lamps should illuminate when commanded ON.
• If the park lamps do not illuminate, refer to Park Lamps Inoperative From BCM.
• If the park lamps are always illuminated, refer to Park Lamps Always On From Relay.
2. Refer to Park Lamps Inoperative From Switch.
Circuit/System Testing
Park Lamps Inoperative From BCM
1. Ignition OFF, disconnect the X1 harness connector at the BCM.
2. Ignition ON, install a 3A fused jumper wire between the park lamp relay control circuit terminal 8 and ground. Verify the park lamps illuminate.
• If the park lamps do not illuminate, test the relay control circuit terminal 8 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.
3. If all circuits test normal, replace the BCM.
Park Lamps Always On From Relay
1. Ignition OFF, disconnect the X1 harness connector at the BCM.
2. Ignition ON, verify that a test lamp does not illuminate between the park lamp relay control circuit terminal 8 and B+.
• If the test lamp illuminates, test the control circuit terminal 8 for a short to ground.
3. Verify that the park lamps are not illuminated.
• If the park lamps are illuminated, test the park lamp supply voltage circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.
4. If all circuits test normal, replace the BCM.
Park Lamps Inoperative From Switch
1. Disconnect the X1 harness connector at the turn signal/multifunction switch.
2. Install a 3A fused jumper wire between the park lamp switch signal circuit terminal 3 and ground. Verify the scan tool Park Lamp Switch parameter is Active.
• If not the specified value, test the signal circuit terminal 3 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
3. Test the signal circuit terminal 3 for a short to ground. If all circuits test normal, replace the turn signal/multifunction switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Underhood Electrical Center or Junction Block Bracket Replacement (Underhood Electrical Center or Junction Block Bracket Replacement)
* Turn Signal Multifunction Switch Replacement (Turn Signal Multifunction Switch Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming