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  #1  
Old 01-11-2020, 02:18 AM
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lots of electrical issues and a little help on where to start.

2008 3.0si

When I first got the vehicle the fog lights would flicker and one is on all the time but they both work when I put on the switch.

Everything else worked as normal.

Fast forward two years and this is where I am at.

SOS error, rear parking sensor error, loss of aux output on radio, loss of phone on radio. The car started slow a few times over the winter but it was cold so i did not think much of it. Also I did not know that lcd fog lights may cause the flickering and some of the issues with those, so I am going to check if they were coded or just put in there when I get a chance to sit down and figure it out.

Checking the numbers on the dash, the car runs at close to 14.9 volts. When i hit the brakes coming to a stop it drops to around 12. When the car sits for more than a few hours it drops to around 11 but has been starting easily.

Yesterday, the right rear brake light stopped working. I took the bulbs out to check them and nothing cleaned/checked all the connectors and still no taillight brake light and now nothing to the right rear lighting. I checked bubs etc with the other side and all those are ok.

I dont know the history on the battery and feel I should just replace it at this point since im having these issues and the volts seem low when it sits.

I am new to inpa and will get ncs expert but dont have the experience to really get into them to break this all down.

Hopefully this makes sense, if not please ask. Again, I dont know where to start and I think I should replace the battery and go from there. TIA
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  #2  
Old 01-11-2020, 02:22 AM
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How old is the battery? How old is the alternator?
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2006 X5 4.8is Build 11/05 Maintenance/Build Log
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  #3  
Old 01-11-2020, 02:27 AM
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Thanks for the quick reply.

Both are unknown. Ive had the car for about 2 years now. The person that owned the car before me went to jail and have no idea of the history of it as I bought it from a relative.

I can check the battery if there is a date on it.

Last edited by Jaegze; 01-11-2020 at 02:36 AM.
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Old 01-11-2020, 02:31 AM
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Sounds like it might be due for a battery as general maintenance. Then monitor the voltage as you have and if it drops still, it might need an alternator. How many miles on the X5?

Do you have a scanner capable of pulling BMW codes?
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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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  #5  
Old 01-11-2020, 02:40 AM
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It has about 168k on it give or take.

I will keep watching and pay a little more attention to drops or changes in the voltage

I have the cable and got Inpa for reading the codes. Havent done it yet as I just started really looking into the problems. This was actually my plan for my days off on thursday but with one taillight and working noc shift the priority has moved up the list.

Thanks again
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Old 01-12-2020, 12:19 AM
ard ard is offline
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Your car is not like a 1972 ford, where there is ONE Ď12 voltí line, and everything on that line sees 12 v

There are busses with modules that can control sub-systems so that they may not all be at 12, 14 our whatever.

So where ever you dutifully measuring and reporting voltages really are only a shot in the dark. Voltage at the battery, at the DME, at a cigarette lighter may all vary with battery charge, load, etc

Iím gonna guess your FRM is the issue- but just a dumb guess.

I will add that youíve had issues for two years (TWO FRIGGIN YEARS!!!!). It isnít the battery.

Last edited by ard; 01-13-2020 at 01:13 AM.
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Old 01-12-2020, 05:23 AM
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It’s not a 72 Ford. You’re a genius. Next you’re going to tell me it has more than 3 wheels.

I appreciate the uneducated guess to the issue but that was not at all the question I asked.

While I applaud the fact you have 5000+ posts, if they’re all like this what a waste of time.
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Old 01-12-2020, 11:16 AM
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I agree with Ard that the battery is unlikely to be the cause of the issue, but with electrical system diagnosis on a BMW, I like to start with a known good battery. And not knowing how old the one in the vehicle is now, 2+ years at least, I would replace it. 14.9v on the dash is on the high side. Your voltage regulator on the alternator could be shot but we don't know anything for sure yet.

I'd definitely get a BMW code reader as well so you can see exactly what the X5 is reporting as a problem.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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  #9  
Old 01-13-2020, 01:22 AM
ard ard is offline
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lol


Oh, you didnt actually even ASK a question. Read your posts- not a single question. Genius?

Last edited by ard; 01-13-2020 at 02:23 AM.
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  #10  
Old 01-13-2020, 10:26 PM
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Everything ard said is correct.

The X5 is not a 1965 Dodge. It contains many, many electronic modules that control major functions and multiple subsystems and lower functions. These modules run on discrete software loaded on the module. Most systems operate at voltages less than the nominal 12V. Corrupt software can be a problem and the FRM is known to be extremely susceptible to failure which is why ard suggested it. Low voltage can cause problems down the chain.

There's very little chance you've limped along on a failed/failing battery for TWO years. Unless you've been charging it every night.

You've received good advice to start already. There's too many components involved to provide a silver bullet which is what I think you want. Your attitude suggests that.
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