GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Check other instrumentation lights.

Are those lights also off?

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Go to Diagnostic Starting Point - Lighting Systems

Go to Step 2

2

  1. Remove the controller.
  2. Check the voltage between terminals A4 of the controller connector.

Is the voltage within the specified value?

11-14 V

Go to Step 4

Go to Step 3

3

Repair the wiring harness between J6 terminal 3 and controller connector terminal A4.

Is the repair complete?

--

System OK

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4

Check the illumination lamps.

Is one burned out?

--

Go to Step 5

Go to Step 6

5

Replace the burned out illumination lamp.

Is the repair complete?

--

System OK

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6

Replace the ATC controller.

Is the repair complete?

--

System OK

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