For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics
1 | Did you review the headlamps description and operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Lighting Systems
2 |

1. Place the headlamp switch in the HEADLAMP position.
2. Place the headlamp dimmer switch in the HIGH position.
3. Place the headlamp dimmer switch in the LOW position.

Do the headlamps illuminate in both headlamp dimmer switch positions?

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

Go to Step 3

3 | Do the headlamps illuminate in only the HIGH or LOW headlamp dimmer switch positions? | Go to Headlamps Inoperative - High Beams or Headlamps Inoperative - Low Beams | Go to Step 4
4 |

1. Place the headlamp Switch in the OFF position.
2. Disconnect the headlamp dimmer switch.
3. Place the headlamp switch in the HEADLAMP position.
4. Probe the headlamp switch signal circuit at the headlamp dimmer switch connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 5

5 |

1. Place the headlamp switch in the OFF position.
2. Disconnect the headlamp switch.
3. Probe the battery positive voltage circuit of the headlamp switch with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 9

6 | Test the headlamp switch signal circuit for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 8
7 | Inspect for poor connections at the harness connector of the headlamp dimmer 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 10
8 | 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. | Go to Step 12 | Go to Step 11
9 | Repair an open, high resistance, or short to ground in the battery positive voltage circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 12 | --
10 | Replace the headlamp dimmer switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column. 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