Electrical Issue

Purplecty · #1 07-11-2020, 01:22 AM

I was driving a few miles from my place and then noticed the ABS light came on followed by the traction and then the brake and trans fail safe when coming to a stop. The coolant temp guage and oil temp went to max, speedmoter and rpms were also dead and the AC stopped working too. It seems to be stuck in a weird electrical gremlin loop. I scanned the car and had can bus errors for ASC and EGS in the DME and The trans module. I was unable to clear the ASC error in the DME. I read another thread from a 4.4 x5 and was pinpointed to the ABS Module. I have a spare rebuilt one from an e46 and hoping it will work on the X5. If not, I'll have mine rebuilt. Please see the attached video and link to another thread. I was for some strange reason unable to connect ISTA-D to the car. It would not even register the vehicle which must be related to all of this...

https://www.dropbox.com/s/otw24a5o6m...10815.mp4?dl=0

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EODguy · #2 07-11-2020, 03:26 AM

You getting a fluctuation in voltage?

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Purplecty · #3 07-11-2020, 08:12 AM

The cluster shows a steady 13.5v while running.

Purplecty · #4 07-11-2020, 08:53 AM

After letting the car sleep overnight, the cluster returned back to normal and I was able to connect with ista and read and clear all the errors. Name: 20200711_072314.jpg
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PalmSpringsE534.6 · #5 07-11-2020, 10:22 AM

Don't you love how the "Fasten Seat Belts" message has double meaning for us E53 owners? LOL. Glad it came back. I just got my ABS module back from the repair depot. I was going to put it in today but its going to be 115F/46C today...so I think it can wait a few days longer. LOL.

Purplecty · #6 07-11-2020, 10:23 AM

Who rebuilt yours? BBA REMAN?

Purplecty · #7 07-11-2020, 02:07 PM

After a short drive all of the symptoms re-appeared...

wpoll · #8 07-11-2020, 04:21 PM

Seems voltage related... Alternator on the way out? 13.5v is a little lower than I would expect to see when running, but not low enought to cause your issues. Maybe it spikes low...

Purplecty · #9 07-11-2020, 04:23 PM

Doubtful its a steady 13.5-13.8 which is the same as my E38 4.4. I will see if the spare abs module helps first...

PalmSpringsE534.6 · #10 07-11-2020, 04:42 PM

Quote:

Originally Posted by Purplecty

Who rebuilt yours? BBA REMAN?

Actually, I had Module Repair Pro in Van Nuys do it as they have an awesome warranty and turned it around in a day so it was there on Monday and out the door Tuesday and back in my mailbox on Thursday.

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