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

Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Place the headlamp switch in the ON position.
2. Place the dimmer switch in the low beam position.

Do the low beam headlamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Is only one low beam headlamp inoperative?

Go to Step 4

Go to Step 5

Test the headlamp low beam supply voltage and ground circuits for high resistance, an open or a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 9

1. Disconnect the headlamp low relay. Refer to Relay Replacement .
2. Connect a test lamp between the control circuit of the headlamp low relay and the battery positive voltage circuit of the headlamp low relay connector.

Does the test lamp illuminate?

Go to Step 14

Go to Step 6

1. Connect the headlamp low relay.
2. Place the headlamp switch in the HEAD position.
3. Disconnect the multifunction switch.

Do the low beam headlamps illuminate?

Go to Step 7

Go to Step 10

Test the headlamp dimmer switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct a condition?

Go to Step 16

Go to Step 8

Test the headlamp switch flash to pass signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct a condition?

Go to Step 16

Go to Step 11

Inspect for poor connections at the harness connector of the inoperative bulb. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 12

Inspect for poor connections at the harness connector of the headlamp dimmer switch. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 15

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 16

Go to Step 13

Replace the inoperative bulb. Refer to Headlamp Replacement or Headlamp Bulb Replacement .

Did you complete the replacement?

Go to Step 16

--

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 16

--

Replace the low beam headlamp relay. Refer to Relay Replacement .

Did you complete the replacement?

Go to Step 16

--

Replace the headlamp dimmer switch. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the repair?

Go to Step 16

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3