GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the DRL System Check performed?

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Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2

  1. Engage the parking brake.
  2. Disconnect the connector at the park brake warning switch.
  3. Connect a J 39200 DMM between the park brake warning switch connector, pin A, and ground.

Is continuity present?

--

Go to Step 4

Go to Step 3

3

Replace the park brake warning switch.

Do the daytime running lamps (DRL) light with the park brake applied?

--

Go to Daytime Running Lights (DRL) System Check

Go to Step 4

4

  1. Disconnect the connector at the DRL control module.
  2. Connect a J 39200 DMM between the DRL control module connector, cavity A, and the park brake warning switch connector, cavity A, in CKT 1134 (LT BLU).

Is continuity present?

--

Go to Step 5

Go to Step 6

5

Replace the DRL control module.

Do the daytime running lamps (DRL) light with the park brake applied?

--

Go to Daytime Running Lights (DRL) System Check

Go to Step 6

6

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

Do the daytime running lamps (DRL) light with the park brake applied?

--

Go to Daytime Running Lights (DRL) System Check

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