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General E46 Forum
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Old 11-20-2012, 01:48 PM   #1
greydart
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330i Doctors...come in for diagnosis.

Cliffs: 2002 BMW 330i Sport

*Drove car Friday night. Got in to come home battery dead (3yrs old.)

*Jumped car, drove 45 min home, battery DOA at home

* Thought battery was bad since I thought the car would die on it's own if the alternator was bad. Replaced with new battery and let it set over the weekend.

*Drove to work and back on Monday, battery DOA upon arrival home.

* Read up on alternator replacement in DIY, found out that it could be voltage regulator, alternator or something else. Got confused. It's a daily driver and I don't want to rip the alternator out if that's not the issue.

* planned to take it to a shop to diagnose but first thought I'd check the owners manual. Manual says red battery light (only flickered a couple times right before I got home Monday night) meant bad drive belt or bad "alernator/voltage circuit?" (not sure if that's the exact wording.)

* looked under hood for circuit, checked fuse box, dug around behind the trunk liner next to the battery and found a black box where all the cables converge and found a sealed fuse. undid the nuts holding the cables(without disconnecting the battery, in retrospect probably dumb) only to find i couldn't see anything regarding the fuse.

* put it back together, recharged battery for 1.5hrs. car started fine this morning and drives fine, but nav screen is black, radio is on but won't shut off and can't adjust volume, windows won't roll down, car won't lock, seat belt light on on the dash even when buckled???

WTF is wrong? body control module? I had such good intentions.....
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Old 11-20-2012, 01:49 PM   #2
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Replace voltage regulator.

Then replace entire cooling system including belts and pulleys.
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Old 11-20-2012, 02:07 PM   #3
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curious... what does the electrical glitch have to do with the cooling system.
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Old 11-20-2012, 03:31 PM   #4
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curious... what does the electrical glitch have to do with the cooling system.
belts=cooling system/charging system.

no belts=no charging system.

no charging system=no bueno.
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Old 11-20-2012, 03:47 PM   #5
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Quote:
Originally Posted by 325iExecutive View Post
curious... what does the electrical glitch have to do with the cooling system.
nothing except the belt.

Just fix your power problem instead of blowing $700 + an alternator/voltage regulator like Mango just suggested.

Last edited by WDE46; 11-20-2012 at 03:47 PM.
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Old 11-20-2012, 03:59 PM   #6
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nothing except the belt.

Just fix your power problem instead of blowing $700 + an alternator/voltage regulator like Mango just suggested.
voltage regulator=$37

never recommended changing an alternator.

if your E46 has a failed or failing charging system, chances are the cooling system *including belts* needs addressing too.

don't believe me. roll the dice. be my guest.

i have way too much real-world experience with these cars to know what can happen. i've seen three e46s this past month alone w/ failing pulleys, belts, and coolant leaks.

your car.
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Old 11-20-2012, 04:26 PM   #7
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See the link below in my signature for the Hidden OBC Menu. Bring up battery & charging Voltage on the dash. 13.3-14.3 Volts is expect charging Voltage as displayed on the dash, this takes into account about 0.2 Volt loss.

Search FSU on the forum.

Check your engine to body ground strap on the passenger side of car near right motor mount.

http://forum.e46fanatics.com/showthr...ghlight=ground

Replace Voltage regulator is needed, if oil is all over alternator from OFHG leaking, this is also likely a problem.
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Last edited by jfoj; 11-20-2012 at 04:28 PM.
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Old 11-20-2012, 05:32 PM   #8
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Wow. Now those are some leads. I'll check into this.

OFHG? Help me out, I'm drawing a blank...


Oil you say? Oil contacting the alternator? Just had the car go through an oiled rustproofing process two weeks ago that a very reputable body shop owner/family friend recommended (Drill the frame, oil, plug, etc) Oil got on pretty much everything under the hood when they did the underside of the hood. My VCG is leaking also, just got the new one in yesterday so I could replace ASAP.

Quote:
Originally Posted by jfoj View Post
See the link below in my signature for the Hidden OBC Menu. Bring up battery & charging Voltage on the dash. 13.3-14.3 Volts is expect charging Voltage as displayed on the dash, this takes into account about 0.2 Volt loss.

Search FSU on the forum.

Check your engine to body ground strap on the passenger side of car near right motor mount.

http://forum.e46fanatics.com/showthr...ghlight=ground

Replace Voltage regulator is needed, if oil is all over alternator from OFHG leaking, this is also likely a problem.
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Old 11-20-2012, 02:21 PM   #9
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I was baffled by the manual talking about the alternator belt being the root. If that belt goes you've got a lot worse problems than a dead battery.

Anywhoo...I did the water pump, thermostat, exp. tank, both belts, upper and lower hoses, radiator, tensioner and idler pulleys and the AC pulley this past summer.

Mainly I'm trying to get to the root of why the battery is not charging and what happened that all these other interior electrical things have gone haywire.

Keep the ideas and questions coming.
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Old 11-20-2012, 02:22 PM   #10
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It could be a short. My car did the same thing it turned out to be the tailights causing the short. Hope that points you in the right direction.

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Old 11-20-2012, 03:35 PM   #11
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Old 11-20-2012, 05:38 PM   #12
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OFHG = Oil Filer Housing Gasket.

If these leak, theh tend to leak into the top of the alt and will mess up alt brushes.

If the car is new to you, read all the links in my signature.
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 11-20-2012, 05:53 PM   #13
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then after you read all the links in jfoj's sig, read all the links in my sig.
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Old 11-20-2012, 06:45 PM   #14
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OFHG = Oil Filer Housing Gasket.

If these leak, theh tend to leak into the top of the alt and will mess up alt brushes.

If the car is new to you, read all the links in my signature.
OFHG! Got it.

I do my own maintenance as much as possible and it's my 2nd E46. I love them as a cheap daily driver with looks that still outpace many new cars. Thanks again for the info. Still not sure what to make of all the internals going haywire this morning with a full charge on the battery. I'm going to reconnect it tonight and see if the issues are still there.

Any part of this making anyone think it could be a body control module?
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Old 11-20-2012, 07:02 PM   #15
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OFHG! Got it.

I do my own maintenance as much as possible and it's my 2nd E46. I love them as a cheap daily driver with looks that still outpace many new cars. Thanks again for the info. Still not sure what to make of all the internals going haywire this morning with a full charge on the battery. I'm going to reconnect it tonight and see if the issues are still there.

Any part of this making anyone think it could be a body control module?
I've never even heard of a body control module. I think you're making that part up LOL

There's the DME, LSZ, GM5 and maybe something else i'm forgetting. but none that i know of would cause what you are experiencing. while definitely ahead of their time, these cars aren't that complex. don't overthink it. 95% of the time, it's a stupid simple part that just needs replacing at intervals. these are 10 year old, 6-figure mileage cars afterall
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Old 11-20-2012, 07:31 PM   #16
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I've never even heard of a body control module. I think you're making that part up LOL

There's the DME, LSZ, GM5 and maybe something else i'm forgetting. but none that i know of would cause what you are experiencing. while definitely ahead of their time, these cars aren't that complex. don't overthink it. 95% of the time, it's a stupid simple part that just needs replacing at intervals. these are 10 year old, 6-figure mileage cars afterall
Very true....and that's what I love about the car.

Body control module = GM5

I've never really had any of the symptoms of GM5 failure before. Every once in a blue moon my power locks wouldn't work from the remote, and replacing the hood sensor stopped the alarm from going off all the time.
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Old 11-20-2012, 07:55 PM   #17
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These are technically a GM references that goes way back, I am sure there are more that I forgot!
BCM - Body Control Module
ECM - Engine Control Module
PCM - Powertrain Control Module mix of engine and trans control in later years

As for GM5 issues, you should visit www.bmwgm5.com
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Old 11-20-2012, 06:06 PM   #18
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Old 11-20-2012, 08:39 PM   #19
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First, I think you should start by gummi pfleging stuff...show the car your love and it will love you back. Oh, also, the black plastic around the mirrors...it likes when you clean it with magic eraser.

You're welcome!







If by some chance that doesn't fix your issue, though,

Start with battery. New doesn't mean fully charged. Check the date on this 'new' battery, and if you haven't taken your new battery for a longish ride of at least 30 mins. on highway, give that a go.

Check that the cables are actually tight on the terminals...pull up on them. Clean corrosion (and hope you did you vent tube).

...and then...wtf is this oil rustproofing spray coating you've sprayed? I can't believe no one asked about that.

You sprayed your car with oil? You paid someone to drill holes and spray the inside of your frame with oil? I'm sort of a virgin when it comes to drilling holes in my car, but I'm a little, IDK, curious about this. I'm pretty sure you were taken, although maybe you're in a part of the country where people do this with cars coz they do it with tractors or something. I'm very disappointed in Mango for missing this.

If you spray your alt with oil, I don't think it would be good...but before you worry about this, check all connections for tightness and corrosion.

This guy what oiled your car, did he have a beagle on the premises? Sounds familiar somehow.

Oh, cluster test, see SolidJake's vid if you don't know it.

Then replace entire suspension, floor mats, get an xl50, more gummi pflege (not to be used internally).

It could be very dried belts running around seizing pulleys with possible bad tensioner...and it could also be, if you've had belts off recently at all, an incorrect belt routing...you wouldn't be the first, but you'd notice that pretty soon.

Hmmm...did oil spraying guy remove belts?

Maybe there's oil on the pulleys and the belt is slipping?

You actually sprayed the inside and underside of the car with oil? Wouldn't you think of this as a temporary solution...oil would drip down and off of everything...if it really is oil.

Okay, reread it...you charged for 1.5 hours...what was the charge on it...do you know? Also, did it completely charge?

You can clean your alt...and clean its connections to...should be easy to get to by removing airbox...if you didn't know.

Only other thing I can think of causing weird electric issues in disparate places is the ignition switch.

If you've got a strong parasitic drain...check fsr.
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Old 11-20-2012, 09:12 PM   #20
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DMAX,

How you doing in NJ? You got heat or just CO poisoning??

Seems you have been hit or miss here lately.

Hope you are getting back to some form of normalcy for the holidays?

Stay safe and lock your car/gas flap!
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

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