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 perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the ignition, with the engine OFF.
  2. Turn ON the radio.

Does the radio operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

  1. Program the radio. Refer to Radio Setup .
  2. Turn OFF the ignition.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the radio.

Does the radio display Locked?

Go to Step 4

Go to Step 5

4

Replace the radio. Refer to Control Module References .

Did you complete the replacement?

Go to Step 5

--

5

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2