[Eric E92 335i]

It's E92 335i with CA option, i replaced battery to new ones on both, they are both do not work, I have to manually get in the car and insert the key to start the car.

Fuses are all good, maybe the diversity antenna or is there a key sensor that might have gone bad? I've heard water gets into the passenger side compartment and it can do that. I also do not have sound from amp being done from water damage.

Anybody can direct me to right direction it'll be great.

[Seattlesquash]

Originally Posted by Eric E92 335i

It's E92 335i with CA option, i replaced battery to new ones on both, they are both do not work, I have to manually get in the car and insert the key to start the car.

Fuses are all good, maybe the diversity antenna or is there a key sensor that might have gone bad? I've heard water gets into the passenger side compartment and it can do that. I also do not have sound from amp being done from water damage.

Anybody can direct me to right direction it'll be great.

I have the same issue, after some water in the trunk. TCU unit, BT and SOS warning issue dried out and fixed itself but none of my keys work other than manual mode in door. Car starts fine, mirror memory also not working with the seat memory. getting hooked up this weekend to do further diagnostics/coding if/as needed.

[Eric E92 335i]

Originally Posted by Seattlesquash

I have the same issue, after some water in the trunk. TCU unit, BT and SOS warning issue dried out and fixed itself but none of my keys work other than manual mode in door. Car starts fine, mirror memory also not working with the seat memory. getting hooked up this weekend to do further diagnostics/coding if/as needed.

Okay, thanks for your info. I think there is a control module in the passenger side rear, on top of the battery side.

[Seattlesquash]

Originally Posted by Eric E92 335i

Okay, thanks for your info. I think there is a control module in the passenger side rear, on top of the battery side.

My OBD2 cable had issues to connect for diagnostics... Ordering a new one and will let you know when I got it figured out. Thanks.

[Seattlesquash]

Finally got them working, changed my diversity antenna, new TCU + coding, and replaced a series of fuses which appeared to be ok but to be safe. I think the 62/63/64 ish. All works now except folding mirrors and roll up windows with the remote (but from inside or manual with key turn works fine). I will have a buddy check on my coding if that needs a re-visit after all my recent work with battery, starter etc. Anyways, just wanted to update on the progress and if any thoughts please let me know, thanks.

[Eric E92 335i]

Originally Posted by Broken_Gearbox

Not to thread jack but how did the water get in? Do the seals go bad over time? Drain channel blocked?

No the seals crack(rubber molding) and water get in.

Originally Posted by Seattlesquash

Finally got them working, changed my diversity antenna, new TCU + coding, and replaced a series of fuses which appeared to be ok but to be safe. I think the 62/63/64 ish. All works now except folding mirrors and roll up windows with the remote (but from inside or manual with key turn works fine). I will have a buddy check on my coding if that needs a re-visit after all my recent work with battery, starter etc. Anyways, just wanted to update on the progress and if any thoughts please let me know, thanks.

thanks

[Seattlesquash]

Originally Posted by Broken_Gearbox

I've been using Swiss vax seal feed on mine for 7 years and they are doing well. I guess it is one of things we forget or neglect. Good to hear you sorted it.

For some reason the windows up and mirror fold on key fob had to be re-coded. Got it done over weekend and 100% back now. Drives me nuts when it's not perfect and glad to be back. Thanks guys!

[e92srb]

So can the car still start of the battery is dead? I'm assuming you just have to put the key fob in the insert, then hit the push start...?
Someone enlighten me because I think my battery is getting low because every time I start the car without the fob in the insert the dash displays a "battery with a plus sign and a key" warning. And does starting the car without the fob in the insert drain the battery more or something or it doesn't make a difference??
I have a 07 E92 328xi w/ CA

[Seattlesquash]

Originally Posted by e92srb

So can the car still start of the battery is dead? I'm assuming you just have to put the key fob in the insert, then hit the push start...?
Someone enlighten me because I think my battery is getting low because every time I start the car without the fob in the insert the dash displays a "battery with a plus sign and a key" warning. And does starting the car without the fob in the insert drain the battery more or something or it doesn't make a difference??
I have a 07 E92 328xi w/ CA

I don't have CA, but with mine battery symbol comes up if low but with it inserted always starts even when low. However, I understand you are the lucky one with CA - meaning buy a new battery and install it to the fob (CR 2032) hence yours can be replaced and the non ca can't. Therefore yours cannot be charged. Although you might have 99 other problems, this will not be one!

Good luck!

[Eric E92 335i]

Originally Posted by e92srb

So can the car still start of the battery is dead? I'm assuming you just have to put the key fob in the insert, then hit the push start...?
Someone enlighten me because I think my battery is getting low because every time I start the car without the fob in the insert the dash displays a "battery with a plus sign and a key" warning. And does starting the car without the fob in the insert drain the battery more or something or it doesn't make a difference??
I have a 07 E92 328xi w/ CA

Your key battery is low, your key battery is replaceable, look up the manual. CA key all have replaceable battery.

The car will recognize the key in the slot(reads immobilizer and chip) so you can start the car by manually plugging it in. For our case, antenna module is dead so the remote becomes completely unresponsive due to antenna malfunctioning, which means no Comfort Access = manual entry with key and manual insert of key and pressing start :/

Originally Posted by Seattlesquash

For some reason the windows up and mirror fold on key fob had to be re-coded. Got it done over weekend and 100% back now. Drives me nuts when it's not perfect and glad to be back. Thanks guys!

My friends a BMW indy tech and he said all CA related coding(even non-CA vehicles) are related to the registered key, so yeah you lose all that coding... Good thing is i found the antenna diversity for 21 bucks

Thanks for the info!

[e92srb]

Originally Posted by Eric E92 335i

Your key battery is low, your key battery is replaceable, look up the manual. CA key all have replaceable battery.

The car will recognize the key in the slot(reads immobilizer and chip) so you can start the car by manually plugging it in. For our case, antenna module is dead so the remote becomes completely unresponsive due to antenna malfunctioning, which means no Comfort Access = manual entry with key and manual insert of key and pressing start :/




My friends a BMW indy tech and he said all CA related coding(even non-CA vehicles) are related to the registered key, so yeah you lose all that coding... Good thing is i found the antenna diversity for 21 bucks

Thanks for the info!

That's odd that it says that the battery is low because unlocking, locking, starting without key in insert all work fine.. The message pops up for a second only then goes away by itself. And it only comes up for 2 seconds when I start the car without putting the key in the insert.

[e92srb]

Originally Posted by Seattlesquash

I don't have CA, but with mine battery symbol comes up if low but with it inserted always starts even when low. However, I understand you are the lucky one with CA - meaning buy a new battery and install it to the fob (CR 2032) hence yours can be replaced and the non ca can't. Therefore yours cannot be charged. Although you might have 99 other problems, this will not be one!

Good luck!

What's the 99 other problems thing supposed to mean. Ur scaring tf out of me lol I just got this car recently and everyone is telling me how BMW is unreliable and it'll have all these problems and cost a shit ton

[Seattlesquash]

Originally Posted by e92srb

What's the 99 other problems thing supposed to mean. Ur scaring tf out of me lol I just got this car recently and everyone is telling me how BMW is unreliable and it'll have all these problems and cost a shit ton

Nothing personal just and attempt to be funny!

But since our cars are serious business I apologize...

[VTECaddict]

Originally Posted by e92srb

That's odd that it says that the battery is low because unlocking, locking, starting without key in insert all work fine.. The message pops up for a second only then goes away by itself. And it only comes up for 2 seconds when I start the car without putting the key in the insert.

How is it odd? The key battery is low, not dead. That's why the key still works, it's just warning you to change it because it will die soon. If the battery is dead it will show a slashed out key symbol when you try to start the car without it inserted because the car won't be able to communicate with the key. Replace the key battery and the low key battery symbol will go away.

[Eric E92 335i]

Originally Posted by VTECaddict

How is it odd? The key battery is low, not dead. That's why the key still works, it's just warning you to change it because it will die soon. If the battery is dead it will show a slashed out key symbol when you try to start the car without it inserted because the car won't be able to communicate with the key. Replace the key battery and the low key battery symbol will go away.

Exactly. Low battery is just low battery. Once key stops working at certain distances, you have antenna related problem.