I've got an 1999 UK model E38 735 which has an occasional fault on it's Mk2 satnav. I've deduced it's probably losing the calibration on the Gyro so I've got a replacement second hand unit which I'm about to install.
My question is this, can I just swap the units and expect it to work? What I'm concerned about is
1) should I disconnect the battery first 2) Will the break in power when the units are swapped over mean that the software will need to be re-loaded or the car re-coded as I only have the map CD and not the operating software CDI'm a bit nervous about proceeding as an intermittent Sat Nav is better than no Sat Nav and taking it to BMW could be very expensive as they've quoted almost £1500 for a new Nav computer alone with labour on top.
Steve