And if you don't know how, here's how to get the nav into diagnostic mode:
From a cold start (vehicle closed and locked for at least 15min, all gone to sleep, no interior lights on)
1. Open car, insert key and turn to PosI
2. Press ENTER, BACK, ENTER, BACK repeatably during the nav boot up sequence until the screen has risen and a Diagnosis menu is displayed.
3. Go through the diagnostic menus, observing all errors and taking photos of anything noteworthy
Video:
https://www.youtube.com/watch?v=FJTVIfUCdO8&t=14s
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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