Schematic Reference: Headlights Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Do the headlamps and DRL operate properly?

Go to Step 3

Go to Headlamps Inoperative - Low Beams

1. Install the scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Place the headlamp switch in the AUTO position.
4. With a scan tool, observe the Twilight Enable parameter in the instrument panel module (IPM) exterior lamps data list.

Does the Twilight Enable parameter display ENABLED?

Go to Step 8

Go to Step 4

1. Turn OFF the ignition.
2. Disconnect the turn signal/multifunction switch C3 harness connector.
3. Connect a 3-amp fused jumper between the turn signal/multifunction switch twilight sentinel display signal circuit at the turn signal/multifunction switch C3 harness connector and the ground circuit of the turn signal/multifunction switch at the C3 harness connector.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool, observe the Twilight Enable parameter in the IPM exterior lamps data list.

Does the Twilight Enable parameter display ENABLED?

Go to Step 7

Go to Step 5

Test the turn signal/multifunction switch ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 6

Test the twilight sentinel display signal circuit for an open, high resistance, or short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 8

Inspect for poor connections at the C3 harness connector of the turn signal/multifunction switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 9

Inspect for poor connections at the harness connector of the IPM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 10

Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the replacement?

Go to Step 11

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

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2