GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the headlamp switch to the ON position.
  2. Turn the instrument panel dimmer switch to the maximum brightness.
  3. Using a test lamp, backprobe between the radio harness connector C1 terminal 7 to ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 2

2

Repair the poor connection or the open in CKT 230.

Is the repair complete?

--

Go to Radio/Audio System Check

--

3

Service the radio. Refer to Radio Replacement for service procedure.

Is the repair complete?

--

Go to Radio/Audio System Check

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