GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The daytime running lamps stay on when the park brake is applied.

1

Review the daytime running lamp (DRL) operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Operate the DRL.

Does the system operate while the park brake is applied?

--

Go to Step 3

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

3

  1. Disconnect the connector at the DRL control module.
  2. Test the continuity of CKT 1134 (LT BLU) between the park brake warning switch and the DRL control module.

Is continuity present?

--

Go to Step 5

Go to Step 4

4

Repair the open CKT 1134 (LT BLU) between the DRL control module and the park brake warning switch.

Did you complete the repair?

--

Go to Step 8

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5

  1. Disconnect the connector from the park brake switch.
  2. Test the continuity between the park brake warning switch terminal A and ground.

Is continuity present?

--

Go to Step 7

Go to Step 6

6

Replace the park brake warning switch.

Did you complete the repair?

--

Go to Step 8

--

7

Replace the DRL control module.

Did you complete the repair?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3