Parasitic draw

Eric Mechanic Chapel Hill, North Carolina Posted   Latest  

Good afternoon, 

I’m tracking down a parasitic draw on an ’08 (11-07) Mini Cooper convertible and I was hoping someone might know if there is a specific sequence to all the modules on the K-bus bus bar located under the carpet in front of the passenger seat. I ran an auto scan after disconnecting one of the wires and compared it to a scan performed before disconnection and none of the modules disappeared. I was hoping it would be that easy. Thanks for your time.

E.

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Jeff Owner/Technician
Baldwinsville, New York
Jeff Default
 

Check for water intrusion in the FRM module in the drivers side kick panel, this is a common issue for electrical issues.

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Eric Mechanic
Chapel Hill, North Carolina
Eric Default
 

Thanks, I opened up the BCM/ZKE and it looked to be ok. With it disconnected the draw was gone but a lot of things report to that module. Doesn't mean it's not bad.

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Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
 

Hi Eric: Don't know if this will help but I found it very illuminating. diag​.​net/msg/m2gyzegyyw… Guido

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Eric Mechanic
Chapel Hill, North Carolina
Eric Default
 

That's an interesting post for sure. This vehicle does have an aftermarket radio but the K-bus wire has been cut and wrapped. I don't have any communication issues that I know of, the vehicle just won't go to sleep. Thanks.

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Michael Owner/Technician
Quakertown, Pennsylvania
Michael Default
 

I stopped reading at module..under the carpet..on a European vehicle, lol..good luck in your findings.

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
   

I don't even work on Euro, Michael, but even I have seen multiple videos from the Northeast stating, "just find the water (on Euro) and you will find the problem." :-) Still the initial question remains. There is whole bunch of "shut down sequence" information missing from all makes and models SI. I suspect factory training covers the info.

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Michael Owner/Technician
Quakertown, Pennsylvania
Michael Default
 

Yea I wish SI had more on description and operation for sure.

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Anthony Technical Support Specialist
Kirkwood, Pennsylvania
Anthony Default
 

Hi Geoff: The service information resides in the "tool". M-B is the same, in that respect. HTH, Guido

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

Yeah, for Mercedes, and BMW, I was saying in general. Many, many "Help" requests about parasitic draw, I have read, pose the never answered question of "who tells whom to be awake... or even not awake?". As luck would have it, I just found some for a 2020 Corvette though; "The powertrain CAN bus communicates over a dedicated circuit but the other CAN buses use a wake-up message from the…

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Mike Technician
Atlanta, Georgia
Mike Default
 

Just read that article. Thanks for the link. So I guess Snap On will be up to speed on that by it's 35.4 update. Autel probably already has it.

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
   

and by 2036 the SO will cost $50,000 and the Autel will cost $50.00

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Eric Mechanic
Chapel Hill, North Carolina
Eric Default
 

Thanks, I don't know if I have any under-carpet modules. The K-bus splice is under the carpet, the BCM/ZKE is up a bit.

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John Technician
Eden Prairie, Minnesota
John Default
   

This is a little shotgun approach-y, but if it has an RDC module, I’d start by disconnecting that and see if you have a change. Notorious module for messing with the K-can. To answer your question about assigned seating at the K-can splice, at no point have I ever seen pin info (factory info or otherwise) for those combs. It’s come up once at a training class, and the answer then was to just…

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Eric Mechanic
Chapel Hill, North Carolina
Eric Default
 

I didn't see an RDC in the autoscan. Doesn't mean there isn't one since I'm using aftermarket scanners. I'll look into it back at the shop. Appreciate the insight on the K-line splice.

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John Technician
Eden Prairie, Minnesota
John Default
   

Does it have aluminum valve stems? If yes, and the RDC’s not checking in on the auto scan, then it’s definitely suspect. We stock those modules... Edit: pardon my target fixation, your car is a little early for the RDC’s that fail all the time.

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Paul Owner/Technician
Los Angeles, California
Paul Default
 

Does it recognize the rear hatch is closed?

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Robert Diagnostician
Fair Oaks, California
Robert Default
 

Have you tried using an infrared camera to find your parasitic draw? I like to park the car in the shop with the windows down and hood open over night. Put a trickle charger on the battery to keep it charged. Come back in the morning and use the camera to check for heat sources. Have found many a source of drains this way very quickly. Last one I found was a rear heater control panel on an…

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Tim Owner/Technician
Gold Beach, Oregon
Tim Default
 

Open all doors and shut all door light switches, let set over night use infrared camera to see which module is warm

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Sam Mobile Technician
Flint, Michigan
Sam Default
 

I do not mean to sound rude. But Why are you using an aftermarket scanner on a mini/BMW? For $30 and a Jbox you can have a factory scantool and factory service information. I am sure it would be an easy sell to the customer instead if hours h=guessing you have the right info. I do not recommend programming the modules with the Jbox but the factory scan tool and the service information are…

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Stephen Owner/Technician
Bedford, United Kingdom
Stephen Default
 

Had a similar problem with a mini just last week Turned out that although it didn’t have a cd changer the k-line wiring was fitted from factory in the boot taped to a loom and had water ingress in the connection keeping the general module awake

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Eric Mechanic
Chapel Hill, North Carolina
Eric Update
 

Just to wrap this up, it appeared to be an issue with the passenger seat occupancy detection module. The module was duct taped and zip tied to the seat springs and there was some other questionable wiring going on under there. Disconnecting that module allowed the vehicle to go to sleep. There is a recall on the detection mat for that seat, don’t know if that had anything to do with the…

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Eric Mechanic
Chapel Hill, North Carolina
Eric Resolution
 

Apparently I didn't close this thread properly. Please see my previous update for details.

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