diagnosing CA issue

rediahad · 02-06-2019, 02:17 AM

Hey guys my comfort access just stopped working completely. I can't unlock the car nor start it up without putting the key in ignition. I changed remote battery and it unlocks and locks the doors but the care just does not detect the key. I have coding stuff but how do i check to see the error?

codinge90 · 02-06-2019, 03:40 PM

Quote:

Originally Posted by rediahad

Hey guys my comfort access just stopped working completely. I can't unlock the car nor start it up without putting the key in ignition. I changed remote battery and it unlocks and locks the doors but the care just does not detect the key. I have coding stuff but how do i check to see the error?

Load up INPA and check codes. Post up the CAS codes. Here is a video link from YouTube.

rediahad · 03-19-2019, 09:26 AM

i ran cas codes and it sais there are no error codes. does that mean that it is a problem with my key?

ctuna · 03-19-2019, 10:27 AM

Diversity antenna failure is the main cause of CA failure.
(with the symptoms you describe)
I suppose you changed the battery in the FOB and
checked the car battery as well just to get that out of
the way.

rediahad · 03-19-2019, 02:41 PM

Yeah, although wouldnt a failed diversity antenna make it so that i would need to by right next to the car to unlock with remote or not at all? My remote works perfectly fine otherwise

ctuna · 03-19-2019, 10:35 PM

so you are saying it works as a normal Fob just doesn't unlock
when you put your hand on the handle or lock with the same action?
Have you tried opening the trunk with the car locked.

Contact: +1.985.492.0666 call/text or email GcodingBMW AT Gmail.COM
Facebook: www.facebook.com/GcodingBMW

https://www.e90post.com/forums/showthread.php?t=1510527

http://www.bimmerfest.com/forums/sho...d.php?t=903551

Read the 2nd electrical pdf starting on page 35

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

https://www.newtis.info/tisv2/a/en/e...tem-ca/jN45DPn

Tried fuse 61 or whatever the CA module fuse is in your car.

I have changed the battery in both my CA fobs and had no issues.

nate93 · 03-20-2019, 01:40 AM

I had the same issue, although mine was working intermittently. I had to be very close to the car for the key fob to work. I changed out the FBD module on my E93, which is in the rear mirror. Location is different depending on your model. You will have to do some research. CA works flawlessly again after the FBD module replacement.

FBD module is a part of the Diversity antenna.

It was about a year ago that I troubleshoot this, thanks to this man by the username Mashman from Austin. He'd helped me out a bit with this.

02-06-2019, 02:17 AM	#1
rediahad Banned 17 Rep 115 Posts Drives: E71, E93, E92 Join Date: Apr 2018 Location: Sacramento iTrader: (1)	diagnosing CA issue Hey guys my comfort access just stopped working completely. I can't unlock the car nor start it up without putting the key in ignition. I changed remote battery and it unlocks and locks the doors but the care just does not detect the key. I have coding stuff but how do i check to see the error?
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03-19-2019, 09:26 AM	#3
rediahad Banned 17 Rep 115 Posts Drives: E71, E93, E92 Join Date: Apr 2018 Location: Sacramento iTrader: (1)	i ran cas codes and it sais there are no error codes. does that mean that it is a problem with my key?
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03-19-2019, 10:27 AM	#4
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Diversity antenna failure is the main cause of CA failure. (with the symptoms you describe) I suppose you changed the battery in the FOB and checked the car battery as well just to get that out of the way.
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03-19-2019, 02:41 PM	#5
rediahad Banned 17 Rep 115 Posts Drives: E71, E93, E92 Join Date: Apr 2018 Location: Sacramento iTrader: (1)	Yeah, although wouldnt a failed diversity antenna make it so that i would need to by right next to the car to unlock with remote or not at all? My remote works perfectly fine otherwise
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03-19-2019, 10:35 PM	#6
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	so you are saying it works as a normal Fob just doesn't unlock when you put your hand on the handle or lock with the same action? Have you tried opening the trunk with the car locked. Contact: +1.985.492.0666 call/text or email GcodingBMW AT Gmail.COM Facebook: www.facebook.com/GcodingBMW https://www.e90post.com/forums/showthread.php?t=1510527 http://www.bimmerfest.com/forums/sho...d.php?t=903551 Read the 2nd electrical pdf starting on page 35 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 https://www.newtis.info/tisv2/a/en/e...tem-ca/jN45DPn Tried fuse 61 or whatever the CA module fuse is in your car. I have changed the battery in both my CA fobs and had no issues. Last edited by ctuna; 03-19-2019 at 11:03 PM..
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03-20-2019, 01:40 AM	#7
nate93 Private First Class 18 Rep 167 Posts Drives: 2011 E93 Join Date: Dec 2017 Location: Houston, Texas iTrader: (0)	I had the same issue, although mine was working intermittently. I had to be very close to the car for the key fob to work. I changed out the FBD module on my E93, which is in the rear mirror. Location is different depending on your model. You will have to do some research. CA works flawlessly again after the FBD module replacement. FBD module is a part of the Diversity antenna. It was about a year ago that I troubleshoot this, thanks to this man by the username Mashman from Austin. He'd helped me out a bit with this.
	Appreciate 0 Quote