Comfort Access system limited - suddenly stopped working the whole system

hitpoint · 10-04-2021, 05:22 AM

Hey!

My comfort access is not working for more than a year now and I thought that the battery would need to be changed. I did that, and no luck.
The CA does not work on door handles and on the trunk. There is a second lock button on the trunk which stopped working too. It happened all of a sudden, everything at once. Now and then I get the messege on the screen about a limited comfort access. All 3 keyfobs dont work with CA. I also looked at the fuses and they are ok (I think that I looked at the right ones. Maybe you can point me which ones should I look at again).

My question is, how do I diagnose this? I dont live in a big city so the nearest technician is about 50 km from me and I cant leave the car for a few days as I go to work with it and plus I have a baby. It is not very easy for me to be without a car for days, mainly for my baby needs, when actually the car works fine.

Is there anything that I can look into? I found an antenna below my gearshift, sitting ok there but how do I check if it works? Maybe something else? If there is nothing I can do, it will wait for a proper time to be checked by a tech

It is a BMW 320xd GT (pre lci 2014).

I am greatfull for every advice, good or bad I really like that feature though.
Have a good one!

Deni

Billfitz · 10-04-2021, 07:00 AM

Yours is another example of why having an OBD diagnostic tool isn't a luxury, it's a necessity.

hitpoint · 10-14-2021, 12:21 PM

Quote:

Originally Posted by Billfitz

Yours is another example of why having an OBD diagnostic tool isn't a luxury, it's a necessity.

Hey! I have a simple scanner which costs like 40 euros but I think that its functions are very limited. What would you recommend?

Billfitz · 10-14-2021, 01:11 PM

I have a Foxwell NT510 and bimmer-tool Lite app.

Yuriy_S · 10-20-2021, 04:29 AM

Did you check the fuse? Maybe that's the problem

hitpoint · 10-23-2021, 03:42 AM

So an update: the fuse is OK. The mech ran a scan and we got this:
804103 rear bumper antenna, open circuit.

What does that mean? Anyone can help me locate it?

Billfitz · 10-23-2021, 07:32 AM

Open circuit could mean a broken antenna, or a broken antenna lead, or an unplugged lead. Worst case it could be a fault in the FEM You need to find a mechanic familiar with BMW to track it down.

10-04-2021, 05:22 AM	#1
hitpoint New Member 1 Rep 15 Posts Drives: BMW 320xD F34 Join Date: Aug 2019 Location: Sweden iTrader: (0)	Comfort Access system limited - suddenly stopped working the whole system Hey! My comfort access is not working for more than a year now and I thought that the battery would need to be changed. I did that, and no luck. The CA does not work on door handles and on the trunk. There is a second lock button on the trunk which stopped working too. It happened all of a sudden, everything at once. Now and then I get the messege on the screen about a limited comfort access. All 3 keyfobs dont work with CA. I also looked at the fuses and they are ok (I think that I looked at the right ones. Maybe you can point me which ones should I look at again). My question is, how do I diagnose this? I dont live in a big city so the nearest technician is about 50 km from me and I cant leave the car for a few days as I go to work with it and plus I have a baby. It is not very easy for me to be without a car for days, mainly for my baby needs, when actually the car works fine. Is there anything that I can look into? I found an antenna below my gearshift, sitting ok there but how do I check if it works? Maybe something else? If there is nothing I can do, it will wait for a proper time to be checked by a tech It is a BMW 320xd GT (pre lci 2014). I am greatfull for every advice, good or bad I really like that feature though. Have a good one! Deni
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10-04-2021, 07:00 AM	#2
Billfitz Lieutenant General 8218 Rep 16,054 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	Yours is another example of why having an OBD diagnostic tool isn't a luxury, it's a necessity.
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10-14-2021, 01:11 PM	#4
Billfitz Lieutenant General 8218 Rep 16,054 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	I have a Foxwell NT510 and bimmer-tool Lite app.
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10-20-2021, 04:29 AM	#5
Yuriy_S New Member 0 Rep 12 Posts Drives: BMW F34 Join Date: Oct 2021 Location: Kyiv iTrader: (0)	Did you check the fuse? Maybe that's the problem
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10-23-2021, 03:42 AM	#6
hitpoint New Member 1 Rep 15 Posts Drives: BMW 320xD F34 Join Date: Aug 2019 Location: Sweden iTrader: (0)	So an update: the fuse is OK. The mech ran a scan and we got this: 804103 rear bumper antenna, open circuit. What does that mean? Anyone can help me locate it?
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10-23-2021, 07:32 AM	#7
Billfitz Lieutenant General 8218 Rep 16,054 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	Open circuit could mean a broken antenna, or a broken antenna lead, or an unplugged lead. Worst case it could be a fault in the FEM You need to find a mechanic familiar with BMW to track it down.
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