Schematic Reference: Exterior Lights Schematics

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

1

Did you review the exterior lighting description and operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

1. Place the headlamp switch in the PARK position.
2. Place the marker lamp defeat switch in the enable position.

Do the marker lamps illuminate?

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

Go to Step 3

Do the park lamps operate properly?

Go to Step 4

Go to Park, License, and Tail Lamps Inoperative

1. Remove the inoperative marker lamp bulb.
2. Connect a test lamp between the inoperative marker lamp bulb marker lamp supply voltage circuit and inoperative marker lamp bulb ground circuit.
3. Turn ON the marker lamps.

Does the test lamp illuminate?

Go to Step 14

Go to Step 5

Test the marker lamp supply voltage circuit for 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 20

Go to Step 6

Test the marker lamp ground circuit for 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 20

Go to Step 7

1. Disconnect the marker lamp relay.
2. Connect a test lamp between the control circuit of the marker lamp relay and battery positive voltage.
3. Turn the marker lamp defeat switch ON and OFF.

Does the test lamp turn ON and OFF with the marker lamp defeat switch?

Go to Step 8

Go to Step 10

1. Connect a test lamp between the park lamps supply voltage circuit of the marker lamp relay and a good ground.
2. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 9

Go to Step 15

1. Connect a test lamp between the battery positive voltage circuit of the marker lamp relay and a good ground.
2. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 13

Go to Step 16

Test the control circuit of the marker lamp relay for 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 20

Go to Step 11

Test the ground circuit of the marker lamp defeat switch for 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 20

Go to Step 12

Inspect for poor connections at the harness connector of the marker lamp defeat 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 20

Go to Step 17

Inspect for poor connections at the harness connector of the marker lamp 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 20

Go to Step 18

Inspect for poor connections at the inoperative marker 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 20

Go to Step 19

Repair the open, high resistance, or short to ground in the park lamps supply voltage circuit of the marker lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

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Repair the open, high resistance, or short to ground in the battery positive voltage circuit of the marker lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

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Replace the marker lamp defeat switch. Refer to Accessory Switch Replacement in Instrument Panel, Gages, and Console.

Did you complete the replacement?

Go to Step 20

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Replace the marker lamp relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 20

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Replace the inoperative marker lamp bulb. Refer to Roof Marker Lamp Bulb Replacement and Luminescent Lamp Replacement - Outside Mirror .

Did you complete the replacement?

Go to Step 20

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2