GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

SCHEMATIC REFERENCE: Headlights Schematics

1

Did you Perform the Lighting System Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Install a scan tool.
  2. Turn ON the ignition with the engine OFF.
  3. Insure the shift lever is in the PARK position.
  4. With a scan tool, observe the DRL relay status in the dash integration module (DIM) data list.

Does the scan tool display OFF status?

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Go to Step 3

Go to Step 6

3

  1. Turn OFF the ignition.
  2. Disconnect the DRL relay.
  3. Turn ON the ignition, with engine OFF.

Did the DRL headlamps turn OFF?

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Go to Step 4

Go to Step 8

4

Connect a test light from the control circuit of the DRL relay to the coil feed circuit of the DRL relay.

Does the test light illuminate?

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Go to Step 5

Go to Step 9

5

Test for a short to ground in the DRL headlamp relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 11

Go to Step 6

6

Inspect for poor connections at the DIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 11

Go to Step 7

7

Replace the DIM. Refer to Dash Integration Module Replacement in Body Control System.

Did you complete the replacement?

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Go to Step 11

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8

Repair the short to power in the DRL headlamp power feed circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 11

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9

Inspect for poor connections at the DRL headlamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 11

Go to Step 10

10

Replace the DRL headlamp relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 11

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11

Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 2