GM Service Manual Online
For 1990-2009 cars only

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. Disconnect the DRL module connector C1.
  2. Connect a test light between terminal D of the DRL module connector and ground.

Does the test light illuminate?

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Go to Step 3

Go to Step 4

3

Connect a fused jumper between terminal F and terminal D of the DRL module connector C1.

Do the headlamps turn on?

--

Go to Step 5

Go to Step 6

4

Inspect for an open in circuit 1372 between the headlamp switch and the DRL module.

Does an open exist?

--

Go to Step 7

Go to Step 8

5

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

Is the repair complete?

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Go to Step 9

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6

Repair the open in circuit 10 between the DRL module and S227.

Is the repair complete?

--

Go to Step 9

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7

Repair the poor connection or open in circuit 1372.

Is the repair complete?

--

Go to Step 9

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8

Replace the headlamp switch. Refer to Headlamp Switch Replacement

Is the repair complete?

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Go to Step 9

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9

  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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