Frustrating Electricial Issue - Advice Needed

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Oct 11, 2012 | 01:30 PM

wastedcapacity

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From: MA

Frustrating Electricial Issue - Advice Needed

- Interior of car won't turn on
- Indy changes battery, claims CAS module fried after being jumped
- 2nd Indy claim CAS if fine after putting it into different 545i
- Completely stumped, looking for help / suggestions on how to figure out the issues and what to replace

Last edited by wastedcapacity; Apr 12, 2014 at 07:32 AM.

Oct 11, 2012 | 02:21 PM

advancedlogic

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From: Encino, CA

My Ride: 04 545i - Titanium Silver/Black, Sport pkg, Comfort Seats w/ Lumbar, Premium Sound, power rear sunshade, Adaptive Xenon Headlights, Steptronic, Park Distance Control, Fold down rear seats w/ski bag, Aux jack, 6-disk changer, puddle lamps... Engine: Custom Remus cat-back exhaust w/chrome square tips, K&N Air Filter, Charcoal Filter Removed, Sprint Booster :-), 50/50 mix of 91+100 Octane, EuroRev ECU Remap (coming soon lol), Dinan High-Flow Throttle Body (coming soon...maybe lol) Interior: Portable Sirius Stilletto 100 w/car kit, Garmin Nuvi 680 mounted below rear-view mirror, LCI-style I-drive knob, Dark Poplar Center Dashboard Trim. Exterior: E60 forum clings, 5% rear tint, ACS roof spoiler (painted black for distinct look against limo tint), ACS trunk spoiler, ACS add-on front spoiler and rear apron (awaiting installation), "18 Black Staggered BeBeS Style OER (emergency replacement for cracked sport 124 rims), black kidney grill, white accessory lighting (including license and trunk lamps), Angel-eye upgrade, AIB xenon-matched fog lamps, AIB V3's on order, red rear reflectors

Open your trunk and check the area where your spare tire would be. At the bottom of that well is a white electronics box known as the MPM (Micro Power Module). Check for cable terminal corrosion. If that unit has went, so does various major systems.

Oct 11, 2012 | 03:06 PM

Gee_115

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From: Dayton, OH

My Ride: 07 550i Sports Package

Model Year: 2007

Quote:

Originally Posted by wastedcapacity

TL;DR

- Interior of car won't turn on
- Indy changes battery, claims CAS module friend after being jumped
- 2nd Indy claim CAS if fine after putting it into different 545i
- Completely stumped, looking for help / suggestions on how to figure out the issues and what to replace

Firstly, the CAS is tied to the CAR (vin), key, and DME, unless your indy replaced all those they won't work in a new car. However, he is probably right that does not sound like CAS. It sounds a lot like micro power module (MPM). You said your car was in a hail storm which leads me to believe it was outside in a storm/ heavy rains, if you've never moved the micro power module then in its original location it is very susceptible to water damage.

You mentioned you can't tear it down due to location, this is a quick look and see job. Check the MPM as the other member mentioned ( in trunk under spare wheel). If you can't see any visible damage then try to go back to your indy see if they can swap it just for test sake.

If that is not the issue then don't waste anymore time or money go straight to a dealer to diagnose, depending on what it is you could fix your self.

P.S. that is the correct way to jump the car, shouldn't fry anything. Never jump directly at the battery.

Oct 12, 2012 | 12:44 PM

Gee_115

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From: Dayton, OH

My Ride: 07 550i Sports Package

Model Year: 2007

Quote:

Originally Posted by wastedcapacity

Guys -

I checked the MPM and didn't see any wire corrosion. I took the wiring harness off and reseated it into the MPM, no change in the car.

Any other suggestions on what to try? Can't get into the local dealer for a week and a half so I might as well try everything I can on my own.

Doesn't mean its not bad. Try to get it switched just to test, maybe with someone who has a similiar car. I think MPM only goes to 06, so you need a car around that year 04-06. You could also check a junk yard if you don't have anyone you can switch with.

Another thing you can check is the integrated supply module, it has a bunch of fuses and could also cause the issues you are having. It is located in the electronics box under the right air filter under the hood.

Oct 22, 2012 | 07:33 PM

onetime

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Sorry to hear this, i hope its a cheap repair.

Oct 22, 2012 | 09:07 PM

turboawd

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My Ride: 2006 BMW 550i

jump starting cars is never good for them, especially if you connect the jumper cables while the ignition is on, on the dead car. voltage surges can do some damage. body shop may have jumped it also.

good luck.