Navigation Radio Operation - Low Radio/OnStar Volume, Map Disk Error, Clock Does Not Update in New Time Zone (Reprogram Radio and/or Refer to Navigation Supplement-Owners Manual)

Some customers may comment on one or more of the following navigation (U3U) and (UVB) radio concerns:

Do not replace radio for these concerns.

Low Volume Concern

Verify that the Navigation radio has been properly programmed. If reprogramming is needed, use the latest calibration available in TIS2000 version 2.75 or later (Calibrations 15260986 w/ Y91 or 15260985 w/o Y91).

Important: 

1. Be sure to scan for and note any DTCs prior to programming that may be associated with any other items on the repair order.
2. Make sure TIS and the Tech 2® are updated with the latest software.
3. Battery voltage is greater than 12 volts but less than 16 volts. The battery must be charged before programming if the battery voltage is low.
4. After programming is complete, be sure to check and clear any DTCs that may have set as a result of the programming.

Map Disk Error

This may be caused by operator error. Confirm that the map disk is installed in the correct slot located behind the navigation screen. To access this slot, go to the Navigation menu and select the "load map" CD button. Specific instructions and location of this slot can be found in the Navigation Supplement Owner's Manual.

Clock Will Not Update in New Time Zone

This is normal operation and the radio should not be replaced for this concern. Refer customers to the Navigation Supplement Owner's Manual regarding this feature, which provides the instructions on how to manually change the clock setting.

For vehicles repaired under warranty, use: