High Battery Drain - DEALER CAN'T FIND CAUSE!
06-11-2010 | 07:43 AM
#14
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Joined: Mar 2008
Posts: 5,073
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From: new york
My Ride: 2011, E90 M3 Sedan. Alpine White.Competition package, Keyhole cover, fender reflectors in Alpine white, RPI Exhaust, 19
06-11-2010 | 10:49 AM
#16
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Joined: Jan 2008
Posts: 48
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From: Calgary, Alberta, Canada
My Ride: 2007 550I Sport, Jet Black w/Tan Interior: Comfort Access, Premium Package, Nav, Sirius Radio, Cold Weather Package
I had the same problem, rear drivers side CAS door handle unit was defective and had to be replaced after similar gyrations with the CAS. I have also had to have the TCU replaces following a couple attempts to rosolve an SOS malfuntion. All is good now; but I've decided to leave the FOB in the ignition when I wash or polish the car to prevent un-needed door lock cycling; may help, may not.
06-11-2010 | 01:07 PM
#17
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Joined: Jun 2008
Posts: 1,285
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From: Queens/Long Island NY
My Ride: 2006 550i Black Saphire/Black Dakota Leather- Loaded- M5 Appearance Package, Sport Package, Pro logic 7 Premium Sound, Navigation, Cold Weather Package, Comfort Package, Heads-up Display, park Distance Control, Bluetooth, Active Steering, Electric Rear Sunshade, Rear Folding Seats, Front/Rear Heated Seats, Xenon lights, Satelite Radio- Extended Maintenance, CPO (Considering Tire/Wheel Insurance)
As Eurocarfan knows, I have the same battery issuse recently, but it has disappeared for 1 week now. 
06-11-2010 | 03:05 PM
#18
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Joined: Aug 2005
Posts: 11,432
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From: San Jose, CA
My Ride: E60 M5, F85 X5M
Seems like a lot of people think it's the door handle comfort access module and I told my dealer to check that this morning. We'll see.
06-11-2010 | 04:06 PM
#19
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Joined: Dec 2007
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From: The State of Southern NJ!
I drive approx 40-200/miles per day so my driving pattern is not at fault.
One interesting note is that 2-3 times before the car went dead I found the driver's door unlocked in the morning. So your post about the Comfort Access Door module has peaked my curiosity!
The dealer will continue the investigation when I return the car to them next week.
06-11-2010 | 07:30 PM
#20
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Joined: Aug 2005
Posts: 11,432
Likes: 1
From: San Jose, CA
My Ride: E60 M5, F85 X5M
Were there any tell tale signs that the comfort access handle module was at fault? I had my electrical system go dead last week and the dealer determined the ignition was "left on". Additional diagnosis is required as I told them I lock the car each evening (with CA) and NEVER leave the key fob in the car.
I drive approx 40-200/miles per day so my driving pattern is not at fault.
One interesting note is that 2-3 times before the car went dead I found the driver's door unlocked in the morning. So your post about the Comfort Access Door module has peaked my curiosity!
The dealer will continue the investigation when I return the car to them next week.
I drive approx 40-200/miles per day so my driving pattern is not at fault.
One interesting note is that 2-3 times before the car went dead I found the driver's door unlocked in the morning. So your post about the Comfort Access Door module has peaked my curiosity!
The dealer will continue the investigation when I return the car to them next week.