GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Was the Exterior Lights System Check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

Disconnect the combination switch.

Do the lamps turn off?

--

Go to Step 3

Go to Step 4

3

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

Is the repair complete?

--

Go to Exterior Lights System Check

--

4

Remove the light 1 relay.

Do the lamps turn off?

--

Go to Step 5

Go to Step 7

5

Test for a short to ground in the RED/GRN wire between the light 1 relay and the combination switch.

Was a short found?

--

Go to Step 11

Go to Step 6

6

Replace the light 1 relay.

Is the repair complete?

--

Go to Exterior Lights System Check

--

7

Disconnect the junction block connector C5.

Do the lamps turn OFF?

--

Go to Step 8

Go to Step 9

8

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

    • The light 1 relay
    • The front park lamps
    • The junction block

Is the repair complete?

--

Go to Exterior Lights System Check

--

9

Test the RED/YEL wire for a short to ground between the following components:

    • The junction block
    • The license plate lamps
    • The illumination lamp of the manual selector lever
    • The rear combination lamps

Was a short found?

--

Go to Step 11

Go to Step 10

10

Refer to Interior Lights Dimming System Check in order to diagnose the interior lights dimming system.

Is the diagnosis complete?

--

Go to Interior Lamps System Check

--

11

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

Is the repair complete?

--

Go to Interior Lamps System Check

--