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-   -   2002 M3 Key Issues (http://www.bimmerfest.com/forums/showthread.php?t=182974)

2002 BMW ///M3 01-07-2007 02:25 PM

2002 M3 Key Issues
 
I recently bought a 2002 M3, and got 2 remote keys with the car. they both lock and unlock the doors ect, but only 1 will start the car continuously. if i start the car with the "good" key, and turn it off, and put the "bad" key in, it starts, but if i turn it off, and try to restart it with the "bad" key, it wont work. whats going on???

bren 01-07-2007 04:50 PM

Have you tried driving around for a while while using the "bad" key?

2002 BMW ///M3 01-07-2007 06:54 PM

i drove around for about 30 min but that didnt help. maybe i should drive longer??

bren 01-08-2007 05:57 AM

The keys contain a battery, I was thinking maybe it wasn't charged. I suppose the battery could have gone bad. This doesn't explain the sometimes starting though. :dunno:

dawgbone 01-08-2007 09:43 AM

does the key pass an electronic code to the security system(ECU)?

it could be alot like a CMOS battery of a pc....where it has to have 5 volts to keep stored settings in memory when the PC is turned off...

bren 01-08-2007 11:11 AM

Quote:

Originally Posted by dawgbone (Post 2108017)
does the key pass an electronic code to the security system(ECU)?

it could be alot like a CMOS battery of a pc....where it has to have 5 volts to keep stored settings in memory when the PC is turned off...

AFAIK, that is correct.


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