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Q: just replaced my battery, and lost display on navigation system on 2001 BMW 530i

my 2001 530i just had the engine replaced. i noticed my whole electrical is out whack now. coded alarm keys no longer work with keyless entry, internal cab lights stay on for about 15-20min. before they turn off after manually locking doors, navigation display no longer works; screen illuminates though, stereo works but shuts off after 5min...eds bmw in covina ca. suggested i need to replace a module that apparently controls all this...has any one experienced these symtoms?
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The function you mention are mostly governed by different control units. Please take it back to the place of repair and complain complain complain. Very few instance several control units fail coincidentally. Before returning, try a battery power reset. Remove the negative terminal off the battery for 10 mins, refit, tighten and retest.
Yes, I have had this happen 2 times.. Not sure exactly what causes it, but it seems to be a design issue. When the battery is low and you put a jumper on the battery or if you replace the battery, a voltage spike occurs when connecting the new battery can sometimes short out the navigation computer in the rear trunk on the left compartment. This provides the video signal for all BC functions to the navigation display in the front. .. I assuming you can still hear your radio and change stations using the front display, but cannot see the display? correct? The easiest way to check if its bad is to make sure the battery is fully charged and swap it with a known good part from another vehicle. Ususally you will have to replace the unit and recode the vehicle. As for your keys, they need to be reprogrammed to the vehicle. they probably lost programming when the voltage went low.
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