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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Comfort access... Help!



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      02-25-2019, 05:45 PM   #1
Yam_440i
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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
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      02-25-2019, 06:39 PM   #2
ctuna
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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 .
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      02-26-2019, 01:00 PM   #3
Yam_440i
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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.
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      02-26-2019, 01:20 PM   #4
ctuna
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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 01:26 PM..
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      02-26-2019, 02:05 PM   #5
Emilime75
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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.
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      02-26-2019, 03:02 PM   #6
ctuna
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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.
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      02-26-2019, 04:25 PM   #7
Yam_440i
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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!
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      02-26-2019, 05:36 PM   #8
Speedy_12139
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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.
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      02-27-2019, 02:39 AM   #9
Yam_440i
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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.
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      03-06-2019, 02:08 AM   #10
Kdubs88
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Quote:
Originally Posted by Yam_335i View Post
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
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      03-06-2019, 12:40 PM   #11
ctuna
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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 12:48 PM..
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      03-09-2019, 04:21 AM   #12
Kdubs88
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Hey guys so for me, it was the diversity antenna. Super simple to swap out, and now I'm good as gold. Thank you!
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