[CLRBLND]

Helo all, I have a 08 335xi with comfort access and my key fob has given me nothing but issues for a while. First I just wanna say I know there are lots of posts similar to this and ive checked 98% of them.

The problem started as the fob didnt lock/unlock the car, decided to replace the battery and YAY it works and all the CA features were working great.

But about a week later it stopped working again changed the battery with my other fob (that was not working) and the original fob started to work again? (i was confused but happy) a day later im writing this because its all back to where I started and neither fobs work. I heard that the battery should be changed after atleast a couple of months? (correct me if im wrong) but mine only made it for not even a week. Can anyone offer ANY kind of help? Also if youre wondering im out of warranty.

A very stressed BMW owner.

EDIT: Ive checked the antenna module and there seems to no sign of corrosion and all wires are intact.

[Wilt]

Fob battery, when needing to be replaced, should cause a dash symbol to be displayed (looks like AA battery symbol along with a key)

Changing the battery 'every few months' is not a need. I have had my CA car for two years, and only once replaced the fob battery (about 3 months into my ownership)

[CLRBLND]

Originally Posted by Wilt

Fob battery, when needing to be replaced, should cause a dash symbol to be displayed (looks like AA battery symbol along with a key)

Changing the battery 'every few months' is not a need. I have had my CA car for two years, and only once replaced the fob battery (about 3 months into my ownership)

There was no symbol and the battery is only a week old

[ctuna]

I should last a few years.
Tints can block radio waves.
A low main car battery is not good either.
Are you sure the new battery you got for the
fob are good. If you have a voltmeter you can check
how good the battery's are.

[fazman]

Originally Posted by CLRBLND

Helo all, I have a 08 335xi with comfort access and my key fob has given me nothing but issues for a while. First I just wanna say I know there are lots of posts similar to this and ive checked 98% of them.

The problem started as the fob didnt lock/unlock the car, decided to replace the battery and YAY it works and all the CA features were working great.

But about a week later it stopped working again changed the battery with my other fob (that was not working) and the original fob started to work again? (i was confused but happy) a day later im writing this because its all back to where I started and neither fobs work. I heard that the battery should be changed after atleast a couple of months? (correct me if im wrong) but mine only made it for not even a week. Can anyone offer ANY kind of help? Also if youre wondering im out of warranty.

A very stressed BMW owner.

EDIT: Ive checked the antenna module and there seems to no sign of corrosion and all wires are intact.

The replacement CA Key battery might be defective or low charge. It can happen that something new isn't really "great" or just bad out of the box.

[CLRBLND]

I'll check the battery with a voltmeter. Will update soon

[CLRBLND]

Battery is okay and has charge. Doubt it's the battery because this is the second one I've tried

[CLRBLND]

Originally Posted by ctuna

I should last a few years.
Tints can block radio waves.
A low main car battery is not good either.
Are you sure the new battery you got for the
fob are good. If you have a voltmeter you can check
how good the battery's are.

Definitely not the tints since it worked perfect for about a week. Then I had to press the button about 10 times for it to unlock and a day after that it was completely dead

[CLRBLND]

.

[sismy]

Maybe a stupid answer but I found that sometimes iPhone can block the signal.

[nicksterv]

This just happened to me, one of my keys was not locking/unlocking doors, I reprogrammed it by putting it in ignition started car, stopped car, took it out of ignition, then repeated the step, I have comfort access, this worked for me, hope it does for you.

[CLRBLND]

Originally Posted by nicksterv

This just happened to me, one of my keys was not locking/unlocking doors, I reprogrammed it by putting it in ignition started car, stopped car, took it out of ignition, then repeated the step, I have comfort access, this worked for me, hope it does for you.

So you basically start and turn off the car twice?