Comfort access... Help!

Yam_440i · 02-25-2019, 06:45 PM

Hi all

I was hoping if you could help me with a problem which I can't seem to solve.

My comfort access has stopped working.

A few points:

I have two key fobs, it does not work with either.
The doors do not open with touch, the engine does not start keyless
I have Carly - after doing a diagnostic fault code check, I have a "EWS-DME 002F4A". I had cleared these codes previously, and comfort access did start working again. Everything was working fine, I had the engine running without key fob in the slot - until on that same day, I revved the car just above 4krpm, and i suddenly got the "key fob faulty, insert key fob to start the engine" with the key signal and a line going through it on my idrive and the comfort access had stopped working again since.

Does anyone have any clues about how I can get my comfort access working again? Or any trouble shooting ideas?

Thanks

ctuna · 02-25-2019, 07:39 PM

Before you do anything on these car's check the resting
battery voltage for the car it should be above 12.4 .
Also I suppose you are aware you can change the battery's
in the CA Fobs.
If you put on window tint it may kill remote functions .

Yam_440i · 02-26-2019, 02:00 PM

Battery voltage at rest is reading 12.36 after being off for a couple of days. Is this a cause for concern?

The battery's in the key fobs have been checked.

ctuna · 02-26-2019, 02:20 PM

That is good enough for voltage.
Typical problems with CA are the diversity antenna ,
Or other CA antenna's
or the CA module.
I believe the CA module is in the battery area on the side above the battery.
Use the following links to check .
Also check the relevant fuses.
Sometimes water leaks can take out electronic modules
if you have had a down poor check for water in all area's of the trunk.

See second electrical pdf for comfort access details.

electical e90 pdf
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU

georges links
https://www.bimmerfest.com/forums/at...9&d=1539905743

Emilime75 · 02-26-2019, 03:05 PM

I had a similar issue when I bought my car(used). Replaced the battery in the fob with an unused one, but one that sat in a drawer for a while. Things didn't work and I thought there was a problem with either the fob, or the CA system. As a last resort before getting gouged at the dealer, I went and bought a fresh, new fob battery.. boom, all working and has been for a year now.

So, go buy a fresh new battery for the fob before doing anymore troubleshooting.

ctuna · 02-26-2019, 04:02 PM

People have mentioned before that Autozone has a signal
detector for Fobs.
Also you can get those cr2032 battery's dirt cheap on ebay .
Be sure to put them in with the proper side facing up.
I believe he said he measured his fob battery's they
should be around 3.6 Volts fresh.

Yam_440i · 02-26-2019, 05:25 PM

Thanks for the tips.

I changed the batteries to brand new key fob batteries, measured it out the box too, which read 3.3volts

Tried on both key fobs, no good.

I think we may be able to rule out key fob issues.

Next I might try the fuses... Gotta feeling this is gonna be a long one!

Speedy_12139 · 02-26-2019, 06:36 PM

Silly question. But you didn't say directly..

Is CA totally non functional. On both doors? Or just one door?

I want to assume both doors.

Yam_440i · 02-27-2019, 03:39 AM

Hey,

Sorry I didn't mention it - it's non functional on both doors + keyless engine start, so pretty much fully non functional.

One further thing to mention is my rear defroster is throwing up a code and not working either. I have read somewhere that could be signs of misbehaving car battery.

Kdubs88 · 03-06-2019, 03:08 AM

Quote:

Originally Posted by Yam_335i

Hey,

Sorry I didn't mention it - it's non functional on both doors + keyless engine start, so pretty much fully non functional.

One further thing to mention is my rear defroster is throwing up a code and not working either. I have read somewhere that could be signs of misbehaving car battery.

I'm dealing with a very similar issue, but to add on, the buttons on my key don't work. Fuse #6 was blown so I replaced it, and I put a new battery in the key. Let me know what you come up with

ctuna · 03-06-2019, 01:40 PM

Could be the diversity antenna.
or CA module.
See pdf 2 for block diagram of CA access.
Don't know about convertibles but broken wiring in the Roof
might be the issue.

electical e90 pdf
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU

To drill down further
https://www.newtis.info/tisv2/a/en/

georges links
https://www.bimmerfest.com/forums/at...9&d=1539905743

Always make sure you have a strong battery before doing anything
on these cars. You will get all kinds of ghosts in the car and bad
diag readings if you don't.

Kdubs88 · 03-09-2019, 05:21 AM

Hey guys so for me, it was the diversity antenna. Super simple to swap out, and now I'm good as gold. Thank you!

02-25-2019, 06:45 PM	#1
Yam_440i First Lieutenant 90 Rep 347 Posts Drives: White BMW 335i convertible Join Date: Apr 2018 Location: London iTrader: (0)	Comfort access... Help! Hi all I was hoping if you could help me with a problem which I can't seem to solve. My comfort access has stopped working. A few points: I have two key fobs, it does not work with either. The doors do not open with touch, the engine does not start keyless I have Carly - after doing a diagnostic fault code check, I have a "EWS-DME 002F4A". I had cleared these codes previously, and comfort access did start working again. Everything was working fine, I had the engine running without key fob in the slot - until on that same day, I revved the car just above 4krpm, and i suddenly got the "key fob faulty, insert key fob to start the engine" with the key signal and a line going through it on my idrive and the comfort access had stopped working again since. Does anyone have any clues about how I can get my comfort access working again? Or any trouble shooting ideas? Thanks
	Appreciate 0 Tweet Quote

02-25-2019, 07:39 PM	#2
ctuna Lieutenant General 2039 Rep 13,352 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Before you do anything on these car's check the resting battery voltage for the car it should be above 12.4 . Also I suppose you are aware you can change the battery's in the CA Fobs. If you put on window tint it may kill remote functions .
	Appreciate 0 Quote

02-26-2019, 02:00 PM	#3
Yam_440i First Lieutenant 90 Rep 347 Posts Drives: White BMW 335i convertible Join Date: Apr 2018 Location: London iTrader: (0)	Battery voltage at rest is reading 12.36 after being off for a couple of days. Is this a cause for concern? The battery's in the key fobs have been checked.
	Appreciate 0 Quote

02-26-2019, 02:20 PM	#4
ctuna Lieutenant General 2039 Rep 13,352 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	That is good enough for voltage. Typical problems with CA are the diversity antenna , Or other CA antenna's or the CA module. I believe the CA module is in the battery area on the side above the battery. Use the following links to check . Also check the relevant fuses. Sometimes water leaks can take out electronic modules if you have had a down poor check for water in all area's of the trunk. See second electrical pdf for comfort access details. electical e90 pdf http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja http://www.google.com/url?sa=t&rct=j...85464276,d.cGU http://www.google.com/url?sa=t&rct=j...85464276,d.cGU georges links https://www.bimmerfest.com/forums/at...9&d=1539905743 Last edited by ctuna; 02-26-2019 at 02:26 PM..
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02-26-2019, 03:05 PM	#5
Emilime75 Colonel 1226 Rep 2,476 Posts Drives: 2010 335i E92 LeMans Blue Join Date: Dec 2017 Location: Merica! iTrader: (1)	I had a similar issue when I bought my car(used). Replaced the battery in the fob with an unused one, but one that sat in a drawer for a while. Things didn't work and I thought there was a problem with either the fob, or the CA system. As a last resort before getting gouged at the dealer, I went and bought a fresh, new fob battery.. boom, all working and has been for a year now. So, go buy a fresh new battery for the fob before doing anymore troubleshooting.
	Appreciate 0 Quote

02-26-2019, 04:02 PM	#6
ctuna Lieutenant General 2039 Rep 13,352 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	People have mentioned before that Autozone has a signal detector for Fobs. Also you can get those cr2032 battery's dirt cheap on ebay . Be sure to put them in with the proper side facing up. I believe he said he measured his fob battery's they should be around 3.6 Volts fresh.
	Appreciate 0 Quote

02-26-2019, 05:25 PM	#7
Yam_440i First Lieutenant 90 Rep 347 Posts Drives: White BMW 335i convertible Join Date: Apr 2018 Location: London iTrader: (0)	Thanks for the tips. I changed the batteries to brand new key fob batteries, measured it out the box too, which read 3.3volts Tried on both key fobs, no good. I think we may be able to rule out key fob issues. Next I might try the fuses... Gotta feeling this is gonna be a long one!
	Appreciate 0 Quote

02-26-2019, 06:36 PM	#8
Speedy_12139 Private 31 Rep 92 Posts Drives: 2011 335i xDrive Join Date: Jul 2018 Location: Ontario, Canada iTrader: (0)	Silly question. But you didn't say directly.. Is CA totally non functional. On both doors? Or just one door? I want to assume both doors.
	Appreciate 0 Quote

02-27-2019, 03:39 AM	#9
Yam_440i First Lieutenant 90 Rep 347 Posts Drives: White BMW 335i convertible Join Date: Apr 2018 Location: London iTrader: (0)	Hey, Sorry I didn't mention it - it's non functional on both doors + keyless engine start, so pretty much fully non functional. One further thing to mention is my rear defroster is throwing up a code and not working either. I have read somewhere that could be signs of misbehaving car battery.
	Appreciate 0 Quote

03-06-2019, 01:40 PM	#11
ctuna Lieutenant General 2039 Rep 13,352 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Could be the diversity antenna. or CA module. See pdf 2 for block diagram of CA access. Don't know about convertibles but broken wiring in the Roof might be the issue. electical e90 pdf http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja http://www.google.com/url?sa=t&rct=j...85464276,d.cGU http://www.google.com/url?sa=t&rct=j...85464276,d.cGU To drill down further https://www.newtis.info/tisv2/a/en/ georges links https://www.bimmerfest.com/forums/at...9&d=1539905743 Always make sure you have a strong battery before doing anything on these cars. You will get all kinds of ghosts in the car and bad diag readings if you don't. Last edited by ctuna; 03-06-2019 at 01:48 PM..
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03-09-2019, 05:21 AM	#12
Kdubs88 Private 20 Rep 52 Posts Drives: 2007 e90 328i Join Date: Aug 2016 Location: Hawaii iTrader: (0)	Hey guys so for me, it was the diversity antenna. Super simple to swap out, and now I'm good as gold. Thank you!
	Appreciate 0 Quote