: For some models, you can enter an engineering menu by holding the temperature up (red) and temperature down (blue) buttons simultaneously for 8 seconds, then selecting "Reset Radio" . The Hidden Menu: Deep Diagnostics

: This may engage the security system or require a "relearn" process by a professional. Troubleshooting Specific Scenarios

Use this if you are selling the car or if a soft reset did not fix the issue. This , including saved locations, paired phones, and system settings.