GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Turn the ignition to the RUN position.

Does the radio VF display illuminate?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the radio connector C1.
  2. Turn the ignition switch to the RUN position.
  3. Connect a test lamp between the radio connector C1 terminal 7 and ground. Refer to Circuit Testing in Wiring Systems.
  4. Turn the park lamps on.

Does the test lamp illuminate?

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Go to Step 6

Go to Step 4

4

Repair the open in circuit 8 between the radio and S224. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 7

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5

Test for and repair a poor connection at the radio connector C1 terminal 7. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 7

Go to Step 6

6

Replace the radio. Refer to Radio Replacement in Entertainment.

Did you complete the replacement?

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Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3