2003 4.4i with ABS lights on plus battery
 

Hi Guys,

I've recently purchased an X5 with known issues off ebay so I did get it cheap.

I have the 3 ABS lights on plus the battery light, the PO said he had the battery and Alt checked and all was fine. Was wondering if the battery light being on had anyting to do with the ABS lights? Could they be seperate issues?

Car is an 03 4.4...

I took it to a friends last night who had a better code reader, it said something about loss of power and another about steering position sensor? I checked the battery terminals last night and they were all good, I'll check the other things later and get back to you-thanks. He tried to clear the lights but they wouldn't go out.

Try turning the steering wheel lock to lock a couple of time.

Tried that, didn't work. Tried the ignition on for 3 minutes, didn't work.

Put it on a battery charger for a few hours, then clear all the codes, then see if that does anything different.

OK, tried the battery charger and it didn't do anything, I tool it back to a mates who scanned it with a different reader, same codes - brief power interuption and steering angle sensor. I think im going to change this first, the BMW specialist wants $1100 to fix it, he says the part is $600 and the fitting takes 3 hours inc coding! I'll fit it myself or get my friend to do it and then take it to them for coding. The PO owner said that the ABS lights were on before the battery light came on so at this stage im assuming it has 2 different issues. I'll change the sesnor and go from there, he tried to clear the lights again, one goes off but comes back on within 5 seconds - the other 2 are permanantly on.

As far as the ABS, you need to get a factory level scan tool that can look into the modules; a generic scan tool won't do anything for you. If you hook the car to a GT1 or Autologic, you can communicate with the ABS module, and see if there are any faults. These will not necessarily throw a code that a generic OBDII scanner will see. If the proper scan tool can not communicate with the ABS module, which is not at all uncommon on these cars, then it's time to replace or rebuild the ABS module. There are services that rebuild the modules for a bit over $100. But not all are rebuildable. The one on my 528i was, the one on my X5 was not. But the rebuilding service supplied a working module for $400, a LOT less than a new one. Once the new module is installed, it then needs to be coded. Not particularly accessible on the X5.

The guy I take it to is an ex BMW mechanic and he has a decent code reader, he got into the ABS section and it said both front sensors and the steering angle sensor are at fault. I think i'll take it to BMW..

Ok, so I haven't taken it to BMW yet but I've ordered a BMW specific code reader, the C110. I also did some further investigating, I noticed a fuse had blown so I'll be replacing that soon, it wasn't one of the four ABS ones. I've had the car parked for the last 4 days and I've just gone out to start it, it just clicks so I checked the voltage and it reads 11.2 volts... I've stuck my trickle charger on it and I'll retest it tomorrow, I did have the passenger door open the other day for 3 hrs whilst I replaced the door carrier, could that have drained the battery that much?