GM Service Manual Online
For 1990-2009 cars only

Headlamps, Daytime Running Lamps (DRL) Off, Ignition in RUN (Park Brake Applied) Scand. (Headlamp Switch Off)

Step

Action

Value(s)

Yes

No

1

Was the entire DRL system check performed?

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Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2

  1. Make sure the headlamps are off..
  2. Turn the ignition switch to the RUN position.
  3. Connect a test light between the Daytime Running Lights (DRL) relay terminal 87 and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 4

3

Repair the poor connection or open in circuit 12.

Is the repair complete?

--

Go to Step 11

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4

Connect a test light between the DRL relay terminals 85 and 86.

Does the test light illuminate?

--

Go to Step 5

Go to Step 6

5

Connect a test light at the DRL relay terminals 30 and 86.

Does the test light illuminate?

--

Go to Step 7

Go to Step 8

6

Connect a test light at the DRL relay terminals 85 and ground.

Does the test light illuminate?

--

Go to Step 9

Go to Step 10

7

Replace the DRL relay.

Is the repair complete?

--

Go to Step 11

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8

Repair a poor connection or open in circuit 1372.

Is the repair complete?

--

Go to Step 11

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9

Repair a poor connection or open in circuit 150.

Is the repair complete?

--

Go to Step 11

--

10

Repair a poor connection or open in circuit 141.

Is the repair complete?

--

Go to Step 11

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11

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all repairs been made?

--

Go to Daytime Running Lights (DRL) System Check

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