Mine does that if I don't power the sat nav 'off' FIRST before switching the car 'off'.
If I start the car then switch on the sat nav......then power it 'off', it lowers and then the Sat Nav remembers the last state it was in. Switch off car and restart, Sat Nav stays down!
Even if you're missing the remote, just power off the Sat Nav first before switching off the car. If it then pops up on the next restart, I would try an RTI reload at your local dealer first. Cost will be about £80 (RTI software is part# 9438400 and costs £42.60 + Vat. Labour is around £25).
If that does not fix the problem then you'll need to send it away for a new PCB. (Cost around £180 for the PCB....£275 if you have to have a new screen also.)
Unfortunately, if you have to send it away for a new PCB, you'll need a software reload at Volvo again before it will work on the car's control's/remote.
I would first check to see if you have any RTI**** fault codes stored in your CEM, as these will be an indication of any RTI faults. Including COMMS faults between RTI and CEM.
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