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Old 03-28-2019, 06:28 AM
Join Date: Mar 2019
Location: Coventry , UK
Posts: 7
Mark H is on a distinguished road
Key fob and comfort access

My key fob and comfort access are not working, I think due to a leaking sunroof. The roof had one corner which was dropped below the level of the rear section so I have just lifted it up, but I have definitely had water in the car because after a heavy shower, when I drove off, water came from the interior light panel, the back of the sunroof and into the passenger footwell (left side, UK car 2007 plate E70).

I am having to lock and unlock with the manual key (setting the alarm off every time I get in), but if I start the car then stop it, remove the key and hit the start button it will start, but only after it has been run and stopped.

I have replaced the battery in both fobs so it isnít the fob, and on occasions the fob has worked to lock and unlock the car so I donít think it is a programming issue.

Comfort access on the door handles does not work at all. Car battery is charged.

Any ideas please?
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Old 03-28-2019, 10:03 PM
Join Date: Dec 2014
Location: New England
Posts: 688
josiahg52 is on a distinguished road
Where are the CAS modules in your vehicle? The FRM is located in the left (US driver's) lower A-pillar by one's foot. The trunk area has other modules, none of which respond to water well. I mean, if either of these or countless other modules or systems were wetted, who knows what havoc could be unleashed.
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Old 03-29-2019, 01:32 AM
ard ard is offline
Join Date: Mar 2006
Location: Sierra Foothills, California
Posts: 6,112
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electronics in the rear tend to get flooded when the sunroof drains are not working. Start removing panels and looking for water. I bet there is a ton.
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Old 03-29-2019, 06:11 AM
Join Date: Mar 2019
Location: Coventry , UK
Posts: 7
Mark H is on a distinguished road
I dont know where the CAS modules are in it, I would be interested to know!

I don't actually think the leak is due to blocked drains (although it might be), more likely the sunroof wasn't sealed properly and allowed water in, so I don't know where the water has gone, although there is a good chance a load has gone in the passenger (left) footwell. I have now realigned the sunroof by simply pushing it up from inside, and pulled down the interior lights and disconnected the sunroof plug so it can't be operated, although I am generally the only driver anyway.

I had the day off yesterday so had a look into it, I did pull the rear panels in the boot (trunk) and expected some water but there wasn't any. However, it has been dry for the last two weeks since the major leak, and I am still waiting to see if I get any water ingress from the next shower, and will check this area again when it has rained. I have poured water over the car and the roof doesn't seem to be leaking now.

Whilst I was looking over the car, I pulled all of the fuses relating to the locking systems as per the fuse card, and all were ok. I went back indoors then an hour or so later had to do the school run, and on getting to the car wishfully pressed the unlock on the remote and it worked! So I tried the comfort access on the door handle and it worked! I tried the keyless start and it worked! FANTASTIC!

However, I drove to the school, got out the car and it key fob nor CA worked, and now seems to be intermittent (although more often not working). Comfort access hasn't worked again since!

I understand that the central locking and comfort access systems are different, but there must be something common that they both use (FRM) that has been affected. This one off succesfull use of the CA and key fob, shows that both do work ie the key fob is ok, the door handles are ok etc. Anything else I can try?
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Old 03-30-2019, 01:38 AM
Join Date: Apr 2013
Location: Charlotte
Posts: 394
absentmathis is on a distinguished road
Sunroofs arenít meant to be fully waterproof under the best of conditions. They leak and drain normally through their pans. I donít know where the CA brain is but you should def check your rear tire well and side compartments.
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Old 03-30-2019, 12:18 PM
ard ard is offline
Join Date: Mar 2006
Location: Sierra Foothills, California
Posts: 6,112
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Ditto above. In normal 'perfect' alignment, water gets past the sunroof, and harmlessly drains on out.

You can look for SIGNS of water damage- stains, resident, water marks. Look carefully.
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Old 04-11-2019, 09:37 PM
Join Date: Apr 2019
Location: Great Lakes, Illinois
Posts: 32
Algold415 is on a distinguished road
I'm not completely sure, but it sounds like you're having a similar issue to mine. Was suggested to look at the diversity antenna in the hatch. Here's the link to my post:

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Old 04-11-2019, 09:45 PM
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Premier Member
Join Date: Mar 2005
Location: Show Me
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CAS, from what I found out, is up near the steering wheel behind the panel at the driver's knees.

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Old 04-12-2019, 02:04 PM
Join Date: Aug 2008
Location: EU - NL - Nijmegen
Posts: 35
BMTouring is on a distinguished road
'intermittant' is quite commonly pointing towards water damage.

Your CAS lives here: LINK to newtis

However, to cheer you up my story:

Bought the car, two fob's came with it. With one in the pocket, the comfort access worked, with the other one (only) it did not.

Tried re-synchronising, had it at the dealer to check if it was an original or a fake copy, had the car checked, had the keys removed from cas and put back. All to no avail: one worked, the other did not. They both worked as remotes, and to start the car after plugging it in, but only one worked with comfort access, close and start.

Then the car went back to the seller for almost two months, where it stood for weeks with the battery disconnected.

Picked it up, had a bit of a vocal fight, and drove off. Next day, both keys worked with comfort access........

wonders do happen.
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Old 04-13-2019, 04:29 PM
Join Date: Mar 2019
Location: Coventry , UK
Posts: 7
Mark H is on a distinguished road
Maybe I should disconnect the car and leave it on the drive for a couple of weeks! Can't do that tough as its my only car LOL!

Thanks for the comments on this AlGold415, along with the comments in that thread. I have tried holding the remote up to the diversity module and the key works every time when within a foot or so from it. I guess it has lost ability to transmit any further than this, so I will try to get a replacement unit.
A couple of people have mentioned the radio when referencing this unit, is this unit also the radio receiver? My radio works fine, but I have noticed that when using the rear screen heater, the radio reception is affected and I can see that the screen heater is also plugged into the unit.
Presuming the unit has been affected by water, I have looked for signs of this but can't see any problems, drainage routes seem to be channels rather than pipes or ducts that could have been blocked, I have left the trim off for now and will have a look the next time the car gets wet, or I will try a bucket of water if it doesn't rain soon, typical living in England in the Spring and we are not getting any rain, that never happens!
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