[bmwlover]

Hello. I have such problem. Sometimes errors come and then they go away. When I am checkong with ista have only 2 active errors but sometimes I have engine error and abs error on dash. 
And parking brake reduced sign on hu but parking brake works good.

Any thaughts?

[moreply]

Can Bus problem.

Perform Bus Test bet there is some Shortage. Did you Retrofit anything to the car`?

[bmwlover]

Can Bus problem.

Perform Bus Test bet there is some Shortage. Did you Retrofit anything to the car`?

No retorfit. I have shortage on horn. Fuse dies very often. I replaced fise. Used hirn 3 times, died again. 

P.s.
How to perform bus test? Is this something that ista can test?

[Node]

You get abs fault on dash because you have intermittent fault or rear right wheel speed sensor. On older BMW models car speed was determined based on exactly rear right wheel speed sensor. Not sure how it's on F15, but given other faults like missing road speed signal message happening exactly at the same mileage, I would assume it still works the same way.

So check sensor itself, it's wiring and pickup ring. Or it could be shorting with horn for example. Don't think this is a bus issue. Do the leg work and go through wires. Horn wires are not that long.

[bmwlover]

Abs comes and then hides itself. I tested wheel speed sensor with ista. Ista shows me correct speed on rear right side too.

Visual checking did not give me anything. All seems good. Only problem I see that water drains were full and front side right floor mat was wet. But bdc and fuses are not wet.

[Node]

Abs comes and then hides itself.

Thats the definition of intermittent fault. Which it clearly is in your case. I would swap left/right rear sensors and see if fault moves to the other side. If not - you will have to go centimeter by centimeter and check all the wiring.

Have you really looked at the pickup ring? Whether it's not rusty.

[bmwlover]

Abs comes and then hides itself.

Thats the definition of intermittent fault. Which it clearly is in your case. I would swap left/right rear sensors and see if fault moves to the other side. If not - you will have to go centimeter by centimeter and check all the wiring.

Have you really looked at the pickup ring? Whether it's not rusty.

Fault did not move.

No rust on pickup ring.


Maybe they are icm related errors?

[Node]

I have no idea HOW ICM could be even related to all of that. Is there any aftermarket alarm/tracking system in that car? Would sound quite logical that it would need vehicle speed data from that sensor, horn control to signal, etc. Would be much more logical than ICM.

As I said - do you legwork. I would start with a horn wire as that is much shorter than wheel speed sensor. Start from BDC and go inch by inch or whatever measurement unit you use and look where there might be a problem.

[bmwlover]

No aftermarket things in this car.
Horn wire is good, checked 2 times.
Maybe itself horn is bad.
Problem for me is dsc errors and eps errors.
I think active steering module and icm are on thr floor and floor was wet because of clogged drains.
Anyone knows exactly where is active steering module?

[2013m5]

As you said water on the front passenger floor. You should check the BDC pin/contact for corrosion.
Corrosion = High resistance, shorted and intermittent faults.