Park, License, and/or Tail Lamps Malfunction (European)
Park, License, and/or Tail Lamps Malfunction (European)
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.
Diagnostic Fault Information
Circuit/System Description
Battery positive voltage is applied at all times to both the coil and switch sides of the LT/POS/LP and RT/POS/LP relays located in the rear fuse block. The turn signal/multifunction switch is suppled with ground at G200 at all times. When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp signal circuit to the body control module (BCM). The BCM responds by applying ground to the left and right park lamp relay control circuits. This energizes the left and right park lamp relay coils causing the relay switch contacts to close allowing battery voltage to flow through the LT/POS/LP and RT/POS/LP fuses to all of the park, tail, license, and marker lamps.
Reference Information
Schematic Reference
Exterior Lights Schematics (Exterior Lights Schematics)
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, observe the scan tool park lamp switch parameter while cycling the park lamp switch between the ON and OFF positions. The readings should toggle between ACTIVE and INACTIVE.
• If the readings do not change between the commanded states, refer to Park Lamp Switch Malfunction.
2. Ignition ON, park lamps ON, observe all park/license/marker lamps and license lamps. All park/license/marker lamps should be illuminated.
• If all park lamps are inoperative, refer to Park, License, and/or Tail Lamps Malfunction.
• If only the license lamps are inoperative, refer to License Lamps Malfunction.
Circuit/System Testing
Park Lamp Switch Malfunction
1. Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 9.
• If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool park lamp switch parameter is INACTIVE.
• If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the BCM.
4. Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool park lamp switch parameter is ACTIVE.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the turn signal/multifunction switch.
Park, License, and/or Tail Lamps Malfunction
1. Ignition OFF, remove the fuse of the inoperative park/marker lamps and inspect.
• If the fuse is OPEN, test the voltage supply circuit of the blown fuse for a short to ground.
2. Ignition OFF, disconnect the appropriate position lamp relay.
3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage.
4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the appropriate position lamp relay.
5. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
6. Disconnect the harness connector at the inoperative park/license/marker lamp.
7. Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the inoperative park/license/marker lamp ground circuit and ground
• If greater than the specified range, test the ground circuit for an open/high resistance.
8. Connect the harness connector at the inoperative park/license/marker lamp.
9. Connect a 10A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the appropriate park/marker lamps are activated.
• If the park/marker lamps do not activate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the inoperative park/marker lamp.
10. Connect a test lamp between the B+ circuit terminal and the relay control circuit terminal.
11. Command the park lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
12. If all circuits test normal, test or replace the appropriate position lamp relay.
License Lamps Malfunction
1. Ignition OFF, disconnect the park lamp relay.
2. Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the park lamp relay ground circuit terminal A1 and ground
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal A2 and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage.
4. Ignition ON, park lamps ON, verify that a test lamp illuminates between the B+ circuit terminal C1 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal A2 for a short to ground. If the circuit tests normal, test or replace the park lamp relay.
5. Verify that a test lamp illuminates between the B+ circuit terminal C2 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
6. Disconnect the harness connector at the inoperative license lamp.
7. Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the inoperative license lamp ground circuit terminal 2 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
8. Connect the harness connector at the inoperative license lamp.
9. Connect a 10A fused jumper wire between the B+ circuit terminal C1 and the control circuit terminal A2.
10. Ignition ON, park lamps ON, Verify the license lamps are activated.
• If the license lamps do not activate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the inoperative license lamp.
11. If all circuits test normal, test or replace the park lamp relay.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Rear License Lamp Replacement (Service and Repair)
* Tail Lamp Replacement (Service and Repair)
* Park/Turn Signal Lamp Bulb Replacement (Base) (Service and Repair)
* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Turn Signal Multifunction Switch Replacement (Turn Signal Multifunction Switch Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming