Some owners of the 2007 Chevrolet Tahoe, Suburban, GMC Yukon, Yukon XL, Denali, Denali XL with RPO U3U or UVB may experience one or more of the following navigation (U3U) and (UVB) radio concerns:
1. Low volume from the radio and/or OnStar system -- Reprogram the navigation radio with the latest calibration available in TIS version 2.75 or later.
2. Radio displays "Map Disk Error" when trying to operate navigation portion of radio --This may be caused by operator error. Be sure 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.
TIP: Exact instructions and location of the slot are found in the navigation supplement owner manual.
3. Clock will not update itself when the vehicle enters a new time zone -- This is normal operation and the radio should not be replaced for this concern.
TIP:Â The navigation supplement owner manual explains how to manually change the clock settings.
- Thanks to Paul Radzwilowicz
1. Low volume from the radio and/or OnStar system -- Reprogram the navigation radio with the latest calibration available in TIS version 2.75 or later.
2. Radio displays "Map Disk Error" when trying to operate navigation portion of radio --This may be caused by operator error. Be sure 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.
TIP: Exact instructions and location of the slot are found in the navigation supplement owner manual.
3. Clock will not update itself when the vehicle enters a new time zone -- This is normal operation and the radio should not be replaced for this concern.
TIP:Â The navigation supplement owner manual explains how to manually change the clock settings.
- Thanks to Paul Radzwilowicz
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