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Park, License, and/or Tail Lamps Malfunction

Park, License, and/or Tail Lamps Malfunction

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Left Park Lamp Supply Voltage B2585 02 B2585 04 B2585 01 -
Right Park Lamp Supply Voltage B3867 02 B3867 01, B3867 04 B3867 01 -
License Plate Lamp Control B3883 02 B3883 04 B3883 01 -
Left Headlamp Lamp Ground - 1 - -
Left Tail Lamp Ground - 2 - -
Left License Plate Lamp Ground - 3 - -
Right Headlamp Lamp Ground - 4 - -
Right Tail Lamp Ground - 5 - -
Right License Plate Lamp Ground - 6 - -
1. Left Front Side Marker Lamp Inoperative 2. Left Rear Side Marker Lamp Inoperative 3. Left License Plate Lamp Inoperative 4. Right Front Side Marker Lamp Inoperative 5. Right Rear Side Marker Lamp Inoperative 6. Right License Plate Lamp Inoperative


Circuit/System Description

The park lamps, tail lamps and license plate lights are turned ON when the headlamp switch is placed in the PARK or LOW BEAM position or anytime the headlights are requested. When the body control module (BCM) receives a request from the headlamp switch to turn ON the park lamps the BCM a sends out a voltage on the control circuit, which illuminates the park lamps, tail lamps and license plate lights.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition ON, observe the function of the E2LF side marker lamp-left front, E5E tail lamp-left rear and the E4J park lamp-left front while commanding the Left Park Lamps ON and OFF with a scan tool. The E2LF side marker lamp-left front, E5E tail lamp-left rear and the E4J park lamp-left front should turn ON and OFF while changing between the commanded states

2. If the E2LF side marker lamp-left front, E5E tail lamp-left rear and the E4J park lamp-left front are always ON or always OFF, refer to Left Side Marker/Tail Lamps Malfunction.

3. Ignition ON, observe the function of the E2RF side marker lamp-right front, E5F tail lamp-right rear and the E4K park lamp-right front while commanding the Right Park Lamps ON and OFF with a scan tool. The E2RF side marker lamp-right front, E5F tail lamp-right rear and the E4K park lamp-right front should turn ON and OFF while changing between the commanded states

4. If the E2RF side marker lamp-right front, E5F tail lamp-right rear and the E4K park lamp-right front are always ON or always OFF, refer to Right Side Marker/Tail Lamps Malfunction.

5. Observe the function of the E7L license plate lamp-left and E7R license plate lamp-right while commanding the license plate lamps ON and OFF with a scan tool. The E7L license plate lamp-left and E7R license plate lamp-right should turn ON and OFF when changing between the commanded states

6. If the E7L license plate lamp-left or E7R license plate lamp-right is always OFF, inspect for a burned out bulb or corrosion of the bulb sockets.

7. If the E7L license plate lamp-left and E7R license plate lamp-right are always OFF or always ON, refer to License Plate Lamp Malfunction.


Circuit/System Testing


Left Side Marker/Tail Lamps Malfunction

1. Disconnect the X1 harness connector at the E5E tail lamp-left.

2. Test for less than 30 Ω between the ground circuit terminal C and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Disconnect the appropriate inline harness connector listed below:

• X111 inline harness connector (With TT6/TT7/TT8)

• X115 inline harness connector (Without TT6/TT7/TT8)

5. Test for less than 30 Ω between the ground circuit terminal listed below and ground:

• Ground circuit terminal A

• Ground circuit terminal E

6. If greater than the specified range, test the ground circuit for an open/high resistance.

7. Connect a test lamp between the control circuit terminal listed below and ground.

• E2LF side marker lamp-left front control circuit terminal K

• E4J park lamp-left front control circuit terminal B

• E5E tail lamp-left control circuit terminal B

8. Ignition ON, command the Left Park Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

9. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

10. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.

11. If all the circuits test normal, replace the appropriate left marker lamp.



Right Side Marker/Tail Lamps Malfunction

1. Disconnect the X1 harness connector at the E5F tail lamp-right.

2. Test for less than 30 Ω between the ground circuit terminal C and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition OFF, disconnect the appropriate inline harness connector listed below:

• X112 inline harness connector (With TT6/TT7/TT8)

• X116 inline harness connector (Without TT6/TT7/TT8)

5. Test for less than 30 Ω between the ground circuit terminal listed below and ground:

• Ground circuit terminal A

• Ground circuit terminal E

6. If greater than the specified range, test the ground circuit for an open/high resistance.

7. Connect a test lamp between the control circuit terminal listed below and ground.

• E2RF side marker lamp-right front control circuit terminal K

• E4K park lamp-right front control circuit terminal B

• E5F tail lamp-right control circuit terminal A

8. Ignition ON, command the Right Park Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

9. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

10. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.

11. If all the circuits test normal, replace the appropriate right marker lamp



License Plate Lamp Malfunction

1. Ignition OFF, disconnect the X902 inline harness connector.

2. Test for less than 30 Ω between the ground circuit terminal 15 and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Connect a test lamp between the control circuit terminal 1 and ground.

5. Ignition ON, command the License Plate Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the selected states.

6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

7. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

8. If all circuits test normal, test or replace the E7L license plate lamp-left or E7R license plate lamp-right.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Tail Lamp Replacement

• Front Turn Signal Lamp Bulb Replacement (TT6 Right Hand Bulb) Front Turn Signal Lamp Bulb Replacement (TT6 Left Hand Bulb)

• Liftgate Center Applique Replacement

• Control Module References for BCM replacement, programming and setup