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E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm}


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Old Mon, Jan-12-2015, 09:12:48 PM   #1
Bmw M3 Guy
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Default Procrastinated on replacing my Comfort Access Battery - Fob doesn't work. Tips?

Hey All,

I definitely squeezed all the juice of my key fob battery! I noticed a few months ago the fob's range weakened the more I used it. The CA would still worked when I grabbed a handle and started the engine just fine. It was just when I walked away to lock the car, the signal just got weaker and weaker. It was time I replaced the battery, and now it doesn't unlock/lock (buttons or comfort access) or start the engine. I have to pull the metal key end out to unlock/lock and stick the FOB in the ignition to power on.

I searched and read somewhere of a process I can perform to re-activate/program the FOB with it has a brand new fresh battery. I can't find it anymore! Can anyone locate or send me the procedure so I can get this dang FOB working again?!

I fail to believe that the FOB needs to be re-programmed by a dealer over a simple battery replacement.

Justin
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Old Tue, Jan-20-2015, 01:33:56 PM   #2
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Default Re: Procrastinated on replacing my Comfort Access Battery - Fob doesn't work. Tips?

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Originally Posted by Bmw M3 Guy View Post
Hey All,

I definitely squeezed all the juice of my key fob battery! I noticed a few months ago the fob's range weakened the more I used it. The CA would still worked when I grabbed a handle and started the engine just fine. It was just when I walked away to lock the car, the signal just got weaker and weaker. It was time I replaced the battery, and now it doesn't unlock/lock (buttons or comfort access) or start the engine. I have to pull the metal key end out to unlock/lock and stick the FOB in the ignition to power on.

I searched and read somewhere of a process I can perform to re-activate/program the FOB with it has a brand new fresh battery. I can't find it anymore! Can anyone locate or send me the procedure so I can get this dang FOB working again?!

I fail to believe that the FOB needs to be re-programmed by a dealer over a simple battery replacement.

Justin
I replaced my fob battery after it kept saying that the remote was low on juice (on the dash). Worked perfectly and didn't have to reprogram anything
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Old Thu, Jan-29-2015, 03:32:23 AM   #3
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Default Re: Procrastinated on replacing my Comfort Access Battery - Fob doesn't work. Tips?

You'll need the other FOB. Put the FOB with the new battery into the slot on the dash while you have the other working FOB in the car. Turn the power on, and press the FOB into the slot all the way and hold it in for 3-5 seconds. This will re sync the FOBs.
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Old Tue, Feb-17-2015, 12:50:23 AM   #4
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Default Re: Procrastinated on replacing my Comfort Access Battery - Fob doesn't work. Tips?

I'm glad I found this thread unfortunately, I got the sudden death of my key fob issue. I only have one CA key fob, I've replaced the (2032) battery, tried the insert key into slot, then disengage and press the lock button 3 times while holding down the unlock button with no luck. It all started when my car battery began to show me warnings even during substantial use (hour drive). I even replaced my car battery tried all the above steps and nothing. I can't with Wilsel's method since I only have 1 key. Has anyone tried, heard, or came across the OBD key programmer tool? seems like BS. Might have to take a trip to the dealership for new CA key.
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