GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Radio/Navigation System Schematics

Connector End View Reference: Entertainment/Communication Connector End Views

1

Did you review the Radio/Audio System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Diagnostic Starting Point - Vehicle

2

Test the memory circuit at the radio for battery positive voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 5

Go to Step 3

3

Inspect the harness connectors of the radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 5

Go to Step 4

4

Replace the radio. Refer to Radio Replacement .

Is the replacement complete?

Go to Step 5

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5

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2