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Old 04-13-2017, 01:35 PM   #1
aa240sx
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diamond 3 button key - all functions work but won't start car - help

Greetings - Actually been a longtime member but had a 2000 323i back in the day. Anyway, i now have an 2003 m3 and have been using the valet key to drive her since my 3 button key fob doesn't seem to work.

i actually have a functioning key fob with the lock/unlock trunk unlock and all of these buttons work fine, but recently when I go to start the engine, nothing happens. The key fob itself hasn't been messed with or opened.

Accessories and dash lights all turn on with the key fob, but the act of turning the ignition to on, does nothing.

I have tried the key reprogramming methods in other posts that discuss this issue, but that seems to only be related to the button functions, which as I've stated before, work fine not the ignition portion.

The weird thing - recently I disconnected my battery and when I reconnected it, the key fob started my car but it only did it one time. Do I have a failing key fob that will require a $300 replacement? Or is there anything else I can try?

Like I said, my valet key works fine to start the car, but I am just getting tired of swapping keys to drive my m3 which luckily is just a weekend car anyway.

Thanks for the advicE!
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2000 E46 323i 5 speed - crashed, totalled, scrapped
2002 E39 525i Auto - auto, need i say more? sold
2003 E39 525i 5 speed - sold
1998 E36 M3 5 speed - sold
2003 E46 M3 SMG - Alpine White - 6speed conversion someday..
2001 E39 530i 5 speed - Anthracite Grey
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Old 04-13-2017, 04:10 PM   #2
scottjoh
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diamond 3 button key - all functions work but won't start car - help

Like you assumed, the programming ONLY relates to the remote functions and has nothing to do with starting the engine. The three button remote is bad and needs to be repaired or replaced and just in case you're wondering it has nothing to do with the battery in the key.

Last edited by scottjoh; 04-13-2017 at 04:10 PM.
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Old 04-13-2017, 05:36 PM   #3
Sykriss
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My first thought would be that the transponder inside of the keyfob isn't close enough to the ignition module for the car to recognize that the key's in and legitimate.
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Old 04-13-2017, 08:23 PM   #4
scottjoh
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Quote:
Originally Posted by Sykriss View Post
My first thought would be that the transponder inside of the keyfob isn't close enough to the ignition module for the car to recognize that the key's in and legitimate.
That's not a problem with genuine BMW keys. Only a problem in piece of crap Chinese aftermarket cases, like that stupid flip key case. Horrible!
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