GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

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

--

Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2

Disconnect the DRL control module.

Do the low beam filaments remain lit?

--

Go to Step 3

Go to Step 4

3

  1. Reconnect the DRL control module.
  2. Disconnect the combination switch connector.

Do the low beam filaments remain lit?

--

Go to Step 5

Go to Step 6

4

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

--

5

Repair the short to ground in the RED/WHT wire between the following components:

    • The combination switch
    • The DRL control module
    • The headlamps

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

6

  1. Reconnect the combination switch connector.
  2. Remove the light 2 relay.
  3. Connect a test lamp from cavity 2 of the light 2 relay to B+.

Does the test lamp light?

--

Go to Step 7

Go to Step 9

7

Inspect the RED/BLK wire for a short to ground between the following components:

    • The light 2 relay
    • The DRL control module
    • The combination switch

Is the connection OK?

--

Go to Step 8

Go to Step 13

8

Replace the combination switch. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement in SIR.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

9

Connect a test lamp from cavity 4 of light 2 relay to B+.

Does the test lamp light?

--

Go to Step 10

Go to Step 12

10

Inspect for a short to ground in the BRN/YEL wire between the combination switch and the relay box.

Is the connection OK?

--

Go to Step 11

Go to Step 13

11

Replace the combination switch. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement in SIR.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

12

Replace the light 2 relay.

Is the repair 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

--