Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

DEFINITION: One of the following condition exist:

Did you review the Exterior Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

1. Turn the ignition switch to the OFF position.
2. Turn the headlamp switch to the HEAD position.
3. Place the headlamp dimmer switch in the LOW position.
4. Place the headlamp dimmer switch in the HIGH position.

Do the all headlamps operate properly?

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

Go to Step 3

Are all the headlamps inoperative?

Go to Step 4

Go to Step 7

1. Disconnect the headlamp switch connector.
2. Using a test lamp that is connected to ground, probe the battery positive voltage circuit of the headlamp switch connector that is fed by the HEADLAMP circuit breaker.

Does the test lamp illuminate?

Go to Step 5

Go to Step 8

Connect a fused jumper between the battery positive voltage circuit and the headlamp supply voltage circuit of the headlamp switch connector. Refer to Circuit Testing in Wiring Systems.

Do the headlamps illuminate?

Go to Step 11

Go to Step 6

1. Leave the fused jumper connected.
2. Backprobe the headlamp supply voltage circuit of connector C201 with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 13

1. Disconnect the inoperative headlamp.
2. Probe the ground circuit of the inoperative headlamp with a test lamp that is connected to battery positive voltage.

Does the test lamp illuminate?

Go to Step 9

Go to Step 12

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

Did you find and correct the condition?

Go to Step 18

Go to Step 14

Inspect for poor connections at the harness connector of the inoperative headlamp. 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 18

Go to Step 15

Inspect for poor connections at the harness connector of the turn signal 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 18

Go to Step 16

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 18

Go to Step 17

Repair an open or high resistance in the ground circuit of the inoperative headlamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

--

Repair an open or high resistance in the headlamp supply voltage circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

--

Repair a short to ground in the one of the following circuits:

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

--

Replace the inoperative headlamp. Refer to Headlamp Assembly or Headlamp Bulb Replacement .

Did you complete the repair?

Go to Step 18

--

Replace the turn signal switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column.

Did you complete the repair?

Go to Step 18

--

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 18

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2