GM Service Manual Online
For 1990-2009 cars only

Circuit Description

This DTC is generated by the module when an error occurs between the VIN as received over the class 2 communication circuit and the VIN as stored in the module memory. The only circuit required is the class 2 communications line.

Conditions for Running the DTC

The DTC is run when the module changes from OFF to ON. This may be in response to the radio switch or the ignition ON signal.

Conditions for Setting the DTC

This DTC is generated by the module when an error occurs between the VIN as received over the class 2 communication circuit and the VIN as stored in the module memory. This happens when the radio changes from OFF to ON.

Action Taken When the DTC Sets

The module does not function.

Conditions for Clearing the DTC

Re-calibration with the correct calibrations for the vehicle and cycling the module to OFF then to ON will clear the DTC if there is no damage to the module.

Step

Action

Yes

No

Schematic Reference: Radio/Audio System Schematics

Connector End View Reference: Entertainment Connector End Views

1

Did you perform the Diagnostic System Check - Radio/Audio System?

Go to Step 2

Go to Diagnostic System Check - Radio/Audio System

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, configure the module to the vehicle.

Does the DTC reset?

Go to Step 3

System OK

3

Replace the module. Refer to Digital Radio Receiver Replacement in Entertainment.

Did you complete the replacement?

System OK

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