For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Exterior Lights Schematics DEFINITION: The park lamps and/or marker lamps are always ON.
1 | Did you review the exterior lighting description and operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Lighting Systems
2 | Place the headlamp switch in the OFF position. Are the park and marker lamps OFF? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3
3 | Disconnect the lighting relay. Are the park and marker lamps OFF? | Go to Step 4 | Go to Step 8
4 | Probe the headlamp switch park lamp signal circuit of the lighting relay with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 5 | Go to Step 6
5 |

1. Leave the test lamp connected.
2. Disconnect the headlamp switch.

Is the test lamp illuminated?

Go to Step 9

Go to Step 7

6 | Inspect for poor connections at the lighting 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 12 | Go to Step 10
7 | 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 12 | Go to Step 11
8 | Repair a short to voltage in the park lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 12 | --
9 | Repair a short to voltage in the headlamp switch park lamp signal circuit of the lighting relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 12 | --
10 | Replace the lighting relay. Did you complete the replacement? | Go to Step 12 | --
11 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? | Go to Step 12 | --
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3