Voice Recognition Inoperative for Navigation Functions - keywords controls nav map steering SWC wheel

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Some customers may comment that the Steering Wheel Control (SWC) for Voice Recognition (VR) does not work for Navigation functions. The customer may also experience problems when setting a destination or viewing the map.

Poor voice recognition performance may be experienced when the map disc is warped or scratched. When a customer uses the VR system, the customer's spoken command is compared with a list of stored commands on the map disc. When the command is matched with a command on the list, the command is executed. If the Navigation Radio cannot read the disc, there will not be a match and the command will not be executed.

Try a known good map disc to ensure that the map disc is not at fault before replacing any components.

Note: This issue does not include the OnStar VR system.

Please follow this diagnostic or repair 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.