Schematic Reference: Exterior Lights Schematics

1

Was the Lighting System Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn ON the ignition, with the engine OFF.
2. Place the headlamp switch in the PARK LAMP position.

Do the park lamps operate properly?

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

Go to Step 3

Place the headlamp switch in the HEAD LAMP position.

Do the headlamps operate properly?

Go to Step 4

Go to Headlamps Inoperative - Low Beams

Are all of the park lamps inoperative?

Go to Step 7

Go to Step 5

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

Does the test lamp illuminate?

Go to Step 6

Go to Step 22

Connect a test lamp between the supply voltage circuit of the inoperative park lamp and the ground circuit of the inoperative park lamp.

Does the test lamp illuminate?

Go to Step 20

Go to Step 23

With a scan tool, observe the Park Lamp parameter in the Dash Integration Module (DIM) inputs data list.

Does the scan tool indicate that the Park Lamp parameter is ON?

Go to Step 8

Go to Step 13

1. Place the headlamp switch in the OFF position.
2. With a scan tool, select the Parking Lamps Relay from the Dash Integration Module (DIM) Special Functions Output Controls.
3. Command the PRK LP relay ON and OFF.

Do you hear a click when you command the PRK LP relay ON and OFF?

Go to Step 11

Go to Step 9

1. Turn OFF the ignition.
2. Disconnect the PRK LP relay.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the controlled positive voltage circuit of the PRK LP relay coil and a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 15

1. Connect a test lamp between the controlled positive voltage circuit of the PRK LP relay coil and the control circuit of the PRK LP relay.
2. With a scan tool, command the PRK LP relay ON.

Does the test lamp illuminate?

Go to Step 17

Go to Step 16

1. Turn OFF the ignition.
2. Disconnect the PRK LP relay.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the battery positive voltage circuit of the PRK LP relay switch and a good ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 21

Connect a 15 amp fused jumper between the battery positive voltage circuit of the PRK LP relay switch and the park lamp supply voltage circuit.

Do the park lamps illuminate?

Go to Step 17

Go to Step 22

1. Turn OFF the ignition.
2. Disconnect the headlamp switch.
3. Turn ON the ignition, with the engine OFF.
4. Connect a 3 amp fused jumper between the park lamps on signal circuit and a good ground.
5. With a scan tool, observe the Park Lamp parameter.

Does the scan tool indicate that the Park Lamp parameter is ON?

Go to Step 18

Go to Step 14

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

Did you find and correct the condition?

Go to Step 28

Go to Step 19

Test for an open or high resistance in the controlled positive voltage circuit of the PRK LP relay coil. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 19

Test for an open or high resistance in the control circuit of the PRK LP relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 19

Inspect for poor connections at the PRK 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 28

Go to Step 24

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 28

Go to Step 25

Inspect for poor connections at the harness connector of the Dash Integration Module (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 28

Go to Step 26

Inspect for poor connections at the inoperative park lamp. 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 28

Go to Step 27

Repair an open or high resistance in the battery positive voltage circuit of the PRK LP relay switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

Repair an open or high resistance in the park lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

Repair an open or high resistance in the ground circuit of the appropriate park lamp. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

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

Did you complete the replacement?

Go to Step 28

--

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 28

--

Important:: Perform the setup procedure for the Dash Integration Module (DIM). Refer to Body Control Module (BCM) Programming/RPO Configuration .

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

Did you complete the replacement?

Go to Step 28

--

Replace the inoperative park lamp. Refer to Park/Turn Signal Lamp Bulb Replacement and Tail Lamp Replacement .

Did you complete the replacement?

Go to Step 28

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2