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

Connector End View Reference: Power and Grounding Connector End Views in Wiring Systems

1

Was the Lighting System Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Important:: Vehicle shift lever must be out of the PARK position in order for the daytime running lamps (DRL) to operate.

1. Turn ON the ignition, with the engine OFF.
2. Place the headlight switch to the AUTO position.
3. Depress and hold the brake pedal.
4. Move the gear selector out of park position.
5. Verify the parking brake is disengaged.
6. Expose the ambient light sensor to a bright incandescent light.
7. Wait more than 20 seconds.
8. Observe the DRL lamps.
9. Place the gear selector in the park position.
10. Release the brake pedal.

Did the DRL operate properly?

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

Go to Step 3

Do the high beam headlamps operate properly?

Go to Step 4

Go to Headlamps Inoperative - High Beams

Is the DRL always in the daylight mode (low beam headlights ON at reduced intensity)?

Go to Step 12

Go to Step 5

1. Disconnect the DRL ambient light sensor.
2. At the DRL ambient light sensor harness connector, attach a 3A fused jumper between the DRL ambient light sensor signal circuit and the DRL ambient light sensor reference signal circuit.

Are the low beam headlights on at reduced intensity?

Go to Step 15

Go to Step 6

1. Disconnect the DRL control module.
2. Turn the ignition to the RUN position with the engine off.
3. Using a test lamp connected to a good ground, probe the DRL control module harness connector C2 ignition 3 voltage circuit.

Does the test lamp illuminate?

Go to Step 7

Go to Step 21

Using a test lamp connected to ground, probe the DRL control module harness connector C2 ignition 1 voltage circuit.

Does the test lamp illuminate?

Go to Step 8

Go to Step 22

Using a test lamp connected to ground, probe the DRL control module harness connector C1 battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 9

Go to Step 23

Using a test lamp connected to ground probe the DRL control module harness connector C1 headlamp switch headlamps OFF signal circuit.

Does the test lamp illuminate?

Go to Step 10

Go to Step 24

Using a test lamp, probe the DRL control module connector C2 between the battery positive voltage circuit and the DRL ground circuit.

Does the test lamp illuminate?

Go to Step 11

Go to Step 25

Using a test lamp, probe the DRL control module harness connector C1 between the battery positive voltage circuit and the DRL low beam supply voltage circuit.

Does the test lamp illuminate?

Go to Step 17

Go to Step 20

Disconnect the DRL ambient light sensor.

Does the DRL change modes?

Go to Step 19

Go to Step 13

Test for a short to ground in the DRL ambient light sensor signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 14

Test for a short to ground in the ambient light sensor low reference circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 15

Test for a poor connection or an open in the DRL ambient light sensor signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 16

Test for a poor connection or an open in the DRL ambient light sensor low reference circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 17

Test for a poor connection an open in the headlamp switch supply voltage circuit for the DRL control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 18

Inspect for a poor connection at the harness connector of the DRL control module. 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 29

Go to Step 27

Inspect for a poor connection at the harness connector of the ambient light sensor. 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 29

Go to Step 28

Inspect for a open or high resistance in the DRL headlamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 29

Go to Step 26

Repair a open, high resistance, or a short to ground in the ignition 3 voltage circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

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Repair a open, high resistance, or a short to ground in the ignition 1 voltage circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

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Repair a open, high resistance, or a short to ground in the park lamp fused battery positive voltage circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

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Repair a open, high resistance, or a short to ground in the headlamp switch headlamps OFF signal circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

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Repair a open, high resistance, or a short battery positive voltage in the ground circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 29

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Replace the DRL diode. Refer to Splicing Inline Harness Diodes in Wiring Systems.

Did you complete the replacement?

Go to Step 29

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Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Did you complete the replacement?

Go to Step 29

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Replace the DRL ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement .

Did you complete the replacement?

Go to Step 29

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2