No Digital Signal Processing or Automatic Volume Control on Base Radio

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

The base radio RPO U2R does not display (DSP) Digital Signal Processing or (AVC) Automatic Volume Control features on the radio display as listed in the Owner's Manual.

The base radio RPO U2R does not have these functions as listed in the 2003 Owner's Manual. The manual will be updated for the 2004 model year to delete these features from the base radio.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.