GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Daytime Running Lamps (DRL) Check?

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Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2

  1. Turn the ignition switch to the ON position.
  2. Turn the light switch to OFF.
  3. Using a J 39200 , backprobe the DRL control module from cavity 5 to ground.
  4. Measure the voltage.

Is the voltage greater than the specified value?

B+

Go to Step 3

Go to Step 4

3

  1. Using a J 39200 , backprobe the DRL control module connector from cavity 7 to B+.
  2. Measure the voltage.

Is the voltage greater than the specified value?

B+

Go to Step 5

Go to Step 6

4

Repair the open in the BLK/WHT wire between the junction block and the DRL control module. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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5

  1. Disengage the parking brake.
  2. Using a J 39200 , backprobe the DRL control module from cavity 3 to B+.
  3. Measure the voltage.

Is the voltage greater than the specified value?

B+

Go to Step 8

Go to Step 7

6

Repair the open in the BLK wire between the DRL control module and G201. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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7

  1. Start the engine.
  2. Using a J 39200 , backprobe the DRL control module connector from cavity 4 to ground.
  3. Measure the voltage.

Is the voltage greater than the specified value?

B+

Go to Step 10

Go to Step 12

8

Inspect for a short to ground in the PPL or the RED/YEL wire between the DRL control module and the parking brake switch.

Is the connection OK?

--

Go to Step 9

Go to Step 13

9

Replace the parking brake switch. Refer to Park Brake Lever Assembly Replacement in Park Brake.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

10

Inspect for a short to ground in the RED/WHT wire between the DRL control module and S104.

Is the connection OK?

--

Go to Step 11

Go to Step 13

11

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

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

12

Refer to the diagnosis of the charging system. Refer to Charging System Check in Engine Electrical.

Is the diagnosis complete?

--

Go to Daytime Running Lights (DRL) System Check

--

13

Repair the short to ground. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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