electrical fault linked to battery or alternator?

[xxxmike]

Hi all, some of you may know i have been having a right mare with my 1.4 sport.

Below is SOME of the diagnostic info i have.

Now the strange part is it being all electrical but i cant see an issue with any wiring.

The background is that my power steering pump broke (electric/hybrid unit) and this was replaced. My battery also went flat so i got a new one online that was bigger and more powerful. since then if i turn my steering wheel quickly i can feel the pump not working as it should but when i turn it slower its fine. That and my brake lights are stuck on.
So i am thinking...... would the bigger battery cause this fault? Or could there be an issue with the alternator?

Can i test how much voltage the alternator should be putting out. Or how many amps?
One of the faults points to the high voltage circuit and one to the supply voltage?



1 Fault Found:
16955 - Brake Switch (F)
P0571 - 000 - Implausible Signal - MIL ON


3 Faults Found:ABS Brakes (J104)
01314 - Engine Control Module
004 - No Signal/Communication - Intermittent


4 Faults Found:Auto HVAC
01317 - Control Module in Instrument Cluster (J285)
004 - No Signal/Communication - Intermittent
01314 - Engine Control Module
01299 - Diagnostic Interface for Data Bus (J533)
00457 - Control Module for Network (J519)



3 Faults Found:Cent. Elect. (J519)
01758 - Bulbs for Brake Lamps
006 - Short to Plus - Intermittent
01758 - Bulbs for Brake Lamps
011 - Open Circuit - Intermittent
00532 - Supply Voltage B+
011 - Open Circuit - Intermittent

 

[RUM4MO]

Now that you have a hard record of what that car reports as being wrong, clear all these faults and see if any of them comes back, some of them might be old problems or problems that you have caused while trying to fix this fault. Then report back to us.

Alternator output, you can check that roughly by running the car on fast idle and switch all the lights and rear hatch heater on, and probably the cabin fan, with that load connected, the battery voltage should still be above 12.65V I'd guess - or even more as much as 13.35V.

I would not bother worrying about fitting a bigger than normal battery, the alternator output is regulated to about 13.65V and can delivery maybe 90Amps dependant on which one is fitted to that car.

 

[dm222]

1) what is the coding that you have for the power steering pump?
2) what is the voltage of the battery with the car running on idle?
3) did you check the alternator load wire? http://www.seatcupra.net/forums/showthread.php?t=209472

 

[xxxmike]

Thanks for that both of you.
@RUM4MO just deleted all of the errors and it removed the ESP and MIL light but the brake lights are still on.
Started the car and the ESP and MIL light stayed off and did another diagnostic and strangely its not come back with anything else? Hmmm.

01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
4B-Multifunc. Module -- Status: OK 0000
56-Radio -- Status: OK 0000

Well i say no faults, just the steering one again.

Address 44: Steering Assist Labels: 6Q0-423-156.clb
Part No: 6Q0 423 156 E
Component: Lenkhilfe 0001
Coding: 00110
Shop #: WSC 00000
VCID: 316EB256FC44A1C956-8064

1 Fault Found:
00816 - Power Steering Sensor (G250)
37-00 - Faulty

 

[xxxmike]

Its not possible for the steering sensor to cause the brake lights to stay on is it?
Surely not.

 

[dm222]

Its not possible for the steering sensor to cause the brake lights to stay on is it?
Surely not.

you put a mk4 steering pump inside a mk5... I really dont know, everything is possible...

does your car has ESP?

 

[xxxmike]

It has a warning light that says ESP. It was a mk5 pump with the same part number as what i took off.

 

[dm222]

It has a warning light that says ESP. It was a mk5 pump with the same part number as what i took off.

that pump is from a MK4 (2002-2008) or another VAG car of this time.

Mk5 pumps part number is 6R0 423 156 not 6Q0 423 156



try to change the coding to 11211 and report back what happens.


1 - car has airbag
12 - car with ESP
11 - ibiza


EDIT: the part number 6Q0423156E was only produced until 2000.

the code for your Ibiza, supposing that it is a MK5 (6J) should be 10111 (NO ESP) or 11211 (WITH ESP) but I guess they wont work with such an old unit because cars from that period didnt had ESP integrated with the pump.

if changing the code doesnt work find a compatible unit, it should be 6R0 423 156 (with a letter or not in the end). I think you will go nowhere with that pump.

 

[RUM4MO]

I tend to agree with what dm222 wrote, here is part of the VCDS scan for a 2009 Ibiza with no ESP :- Address 44: Steering Assist Labels: 6Q0-423-156.clb
Part No: 6R0 423 156 A
Component: LenkhilfeTRW V275
Coding: 10121


I can't see any of this being the root cause of the brake lights staying on though, but it will explain any steering issues you are having.

 

[x9moto]

sounds like a possible short between brakelight switched ground and another part of the loom since many of your diagnostics point to shorts and erratic communication.

something worth checking out maybe?

 

[dm222]

I tend to agree with what dm222 wrote, here is part of the VCDS scan for a 2009 Ibiza with no ESP :- Address 44: Steering Assist Labels: 6Q0-423-156.clb
Part No: 6R0 423 156 A
Component: LenkhilfeTRW V275
Coding: 10121


I can't see any of this being the root cause of the brake lights staying on though, but it will explain any steering issues you are having.

Agree, although can't be sure, I would say 95% that they are not related.

The main point, is did the brake lights problem started when the pump was changed? And even then could be just a coincidence.

One thing is for sure to fix the power steering problem he will need a new pump, and code it according to the car.

1 - with airbag
01/12 - depending if the car has ESP or not (01 uses the G250 sensor, 12 uses the G85 sensor)
11 - this is the strength (11 - normal (lighter) / 21 - sport / 31 - cupra)


compatible part numbers:

6R0423156
6R0423156A
6R0423156B
6R0423156C

 

[RUM4MO]

Just one other idea, VW Group tend to give an assembly, like the power steering pump, the platform number of the first platform that that assembly was designed to fit into, in this case "6Q0", if at some time later, and after that platform has ceased production, they redesign or tidy up the engineering drawing package that assembly and it is still being used in a "still in production" other platform, they will rename it and use that later "still in production" platform number, in this case "6R0".

Now, that does not mean that using a "6R0" part in a "6Q0" platform/car is wrong - that will happen with high demand parts.

What is strange here is that a "6Q0" ie early assembly, has ben fitted into a "6R0" ie later platform/car - but without knowing what all the changes in that assembly were when it was "upgraded" from 6Q0 to 6R0 - I don't think that we can 100% say that that older assembly can not be fitted into a newer car, remember the S/W or firmware of the newer version is still 6Q0, ie so should be compatible with that later early 6J car's other controllers.

Generally speaking fitting early parts to a later car is not a good plan and most garages/workshops would avoid it unless they had very good reasons to go ahead with using these early parts especially an assembly that has a smart controller built in.

 

[RUM4MO]

It has a warning light that says ESP. It was a mk5 pump with the same part number as what i took off.

Hum, looks like same S/W range but wrong actual assembly number? Do you still have the old one to prove/disprove this?

Edit:- without me reading back through all your postings, at what age did you buy this car, ie new or used? When and why did you replace the original(?) steering pump?

Ta.

Another Edit:- okay, I can see that you said the previous pump failed, what were the logged faults on that one?

 

[xxxmike]

Hi guys. Thanks for the replies. The original fault was that it stopped working completely when my battery went flat. I ordered the second hand pump online from a vehicle that had apparently done 28k. It was a 1.4 16v sport from 2010 exactly the same as mine and I remember matching the part number that's written on the part itself.
I purchased the car second hand a year and a half ago

To the question about the brake lights stopping when the pump was changed....... no this this before. About a week before.

 

[dm222]

Hi guys. Thanks for the replies. The original fault was that it stopped working completely when my battery went flat. I ordered the second hand pump online from a vehicle that had apparently done 28k. It was a 1.4 16v sport from 2010 exactly the same as mine and I remember matching the part number that's written on the part itself.
I purchased the car second hand a year and a half ago

To the question about the brake lights stopping when the pump was changed....... no this this before. About a week before.

I don't know how that's possible because I'm sure it doesnt belong to an Ibiza 6J. Did you saw it being removed from the other car?


But... did you try to change the coding of the pump already? That's you last hope, otherwise you will need a new one.


Put 11211 or 11221 and report back to us. If it works great, if it doesnt it's most likely because there is an incompatibility.


Regarding the brakes, I can't help much, I will says the obvious thing... are you sure the bulbs are ok?

 

[xxxmike]

Thanks. I'll have a look at the coding.
No I didn't see it come off the car unfortunately.

Changed bulbs, switch, traced wiring.

 

[dm222]

Thanks. I'll have a look at the coding.
No I didn't see it come off the car unfortunately.

Changed bulbs, switch, traced wiring.

changing the code is with engine off, and ignition on.

good luck

 

[RUM4MO]

It does look like a few of us will have to wait a bit longer to see what typically causes this "brake lights stuck on" situation with this revised brake "switch" type of system design.

 

[camel2469]

Just one other idea

 

[RUM4MO]

Just one other idea

Go on, expand on that for us?