This is an alternative and equally effective method for entering Dealer Mode on many 8.4-inch Uconnect 4C systems.
Method 1: The "Radio + Media + Menu" Combination (Best for Uconnect 430N) uconnect 43 hidden menu link
Insert your key and turn the ignition to the RUN or ACC position. Alternatively, press the Push-Button Start twice without pressing the brake pedal. Allow the Uconnect system to fully boot up to the main radio screen. This is an alternative and equally effective method
If your vehicle has a (2018+ models), the access method differs. For those, you typically press and hold the Driver Temperature Up + Front Defrost buttons, or navigate to Settings > Safety/Driving Assistance > Diagnostics (depending on model). Always consult your vehicle’s service manual for exact steps. Allow the Uconnect system to fully boot up
Start your vehicle or turn the ignition to the accessory (AUX) position to power on the radio.
Turn the Tune/Scroll knob to move up and down through the list options.
To enter the hidden menu on a Uconnect 4.3 system, follow this sequence: