Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn OFF the ignition.
2. Turn OFF the twilight delay switch.
3. Observe the park lamps.
4. Turn the park lamps ON and OFF.

Do the park lamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Turn ON the park lamps.
4. With the scan tool, observe the Park Lamp Input parameter in the dash integration module (DIM) Inputs data list.

Does the data parameter display ON?

Go to Step 4

Go to Step 5

1. Expose the sunload sensor assembly to a bright light.
2. Wait more than 20 seconds.
3. Turn OFF the park lamps.
4. With a scan tool, command the parking lamps relay ON and OFF from the DIM Output Control data list.

Did all of the park lamps turn ON and OFF?

Go to Step 18

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the headlamp switch.
3. Connect a 3-amp fused jumper between the park lamp switch ON signal circuit and the headlamp switch ground circuit.
4. Turn ON the ignition, with the engine OFF.

Does the Park Lamp Switch Input data parameter display ON?

Go to Step 16

Go to Step 14

1. Turn OFF the ignition.
2. Disconnect the Park LP relay. Refer to Relay Replacement in Wiring Systems.
3. Connect a test lamp between the Park LP relay control side supply voltage circuit and a good ground.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 7

Go to Step 12

Connect a test lamp between the Park LP relay switch side supply voltage circuit and ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 21

1. Turn OFF the ignition.
2. Connect a test lamp between the park lamp relay control circuit and the Park LP relay control side supply voltage circuit.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool command the park lamp relay ON and OFF.

Did the test lamp turn ON and OFF?

Go to Step 9

Go to Step 13

1. Turn OFF the ignition.
2. Connect a 10-amp fused jumper between the Park LP relay switch side supply voltage circuit and the park lamp supply voltage circuit.
3. Turn ON the ignition, with the engine OFF.

Did all of the park lamps illuminate?

Go to Step 17

Go to Step 10

1. Disconnect the inoperative bulb.
2. Connect a test lamp between the inoperative park lamp supply voltage circuit and inoperative park lamp ground circuit.

Does the test lamp illuminate?

Go to Step 19

Go to Step 11

Test the park lamp supply voltage circuit for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 20

Test the control side supply voltage circuit of the Park LP relay for a high resistance, an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 18

Test the park lamp relay control circuit of the Park LP relay for a short to battery positive voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 18

Test the ground circuit of the headlamp switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 15

Test the park lamp switch on signal circuit of the headlamp switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 18

Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 22

Inspect for poor connections at the Park LP relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 23

Inspect for poor connections at the harness connector of the DIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 24

Inspect for poor connections at the inoperative park lamp bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 26

Go to Step 25

Repair the open or high resistance in the park lamp ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 26

--

Repair the high resistance or open in the switch side supply voltage circuit of the Park LP relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 26

--

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 26

--

Replace the Park LP relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 26

--

Important:: After replacement perform the setup procedure for the DIM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Replace the DIM. Refer to Dash Integration Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 26

--

Replace the inoperative park lamp bulb.

Did you complete the replacement?

Go to Step 26

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2