BCU problem? by Bernard


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Bernard
Started to sort the newly acquired 'S' reg car today, been waiting for a new battery which got lost, but that's another story.

I have some strange intermittent failure of some functions, for example, the Hi-line will go on and off, the turn indicator tell-tales don't work, the climate control errors out and the central locking will only unlock and not lock.

Then suddenly all will function correctly for a short time.
It did appear that a bump on the glovebox would toggle the fault but that may have been coincidence.

I've checked the earth points in the passenger footwell but now I'm thinking that it may be the BCU (Body Control Unit), YWC112330.

Does anyone have one that I can borrow for elimination purposes?
Or a better idea to try next?
I don't like signatures, they take up too much screen space.

Posted 15 Jul 2011, 19:13 #1 

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raistlin
Have you tried re-seating the BCU connectors Bernard? May sound a forlorn hope but I've known it cure many faults.

I have a spare BCU but not sure of the model number. I can bring it along to Four Ashes over the weekend.
Paul

Cogito ergo sum... maybe?

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Posted 15 Jul 2011, 19:26 #2 

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Bernard
Yes, tried that as it would have been a classic fix.
I guess that almost any type will do to eliminate it.
I don't like signatures, they take up too much screen space.

Posted 15 Jul 2011, 20:33 #3 

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raistlin
OK. It's in the car Bernard :)
Paul

Cogito ergo sum... maybe?

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Posted 15 Jul 2011, 20:37 #4 

Last edited by raistlin on 15 Jul 2011, 21:05, edited 1 time in total.

User avatar
Bernard
Thanks Paul.
I don't like signatures, they take up too much screen space.

Posted 15 Jul 2011, 20:49 #5 

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Bernard
Had an hour to spare today on this. I was just about to try Paul's BCU when I thought that I would disconnect the sat-nav unit as it appears to be faulty. In trying to remove the unit I disconnected the parking sensor module.

Since this disconnection the fault has not yet returned.

As the fault is intermittent, I haven't proven anything yet but it looks promising.
I haven't checked the wiring diagrams yet but I assume the parking sensor unit is on the k-bus, maybe?
I don't like signatures, they take up too much screen space.

Posted 19 Jul 2011, 20:25 #6 

User avatar
Duncan
Yes, it's on Kbus.

And as I said over the weekend, it does sound like a Kbus fault. So that sounds like a lucky find!

It may not be the unit itself, but power or ground connections to it could be causing trouble.
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Posted 19 Jul 2011, 21:39 #7 

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kandyman
Funny how I never found this thread when I searched,

The faults mention above are the same faults as I have posted in this thread
viewtopic.php?t=7399

Looks like I'll try disconnecting the parking sensor unit tomorrow.

Bernard any updates on this ?
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Posted 31 Aug 2013, 20:24 #8 

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Bernard
No. Tried a lot of disconnects and never found anything positive. Car sold in desperation.
I don't like signatures, they take up too much screen space.

Posted 31 Aug 2013, 21:54 #9 

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kandyman
Bernard wrote:No. Tried a lot of disconnects and never found anything positive. Car sold in desperation.


Not the answer I wanted to hear.

Did the disconnection of the parking ecu stop the fault while it was disconnected ?

What else did you try ?

Thanks

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Posted 31 Aug 2013, 22:59 #10 

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Bernard
Sorry Andy, only just found that I hadn't replied. We are in Spain for a month and I don't access the internet all the time.

The short answer is 'no' but everything I tried appeared to make the interval of fault free time a bit longer. I'm sure that there is another thread somewhere listing the other actions that I carried out including the actual problems found and corrected - all to no avail. I could not work out how to test the immobiliser connection and have since wondered if it could have been the seat memory module as the K-bus goes there too and it can be a damp area. Those were the only two K-bus connections not eliminated as far as I know.
I don't like signatures, they take up too much screen space.

Posted 12 Sep 2013, 08:20 #11 

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takestock
Bernard wrote: We are in Spain for a month

Oh, just slip that in why don't you...... :gmc:
Photobucket = Tossers

Dave....

Posted 12 Sep 2013, 17:57 #12 

User avatar
Bernard
...Just looking for a bit of sympathy, having to endure such privations. ;)
I don't like signatures, they take up too much screen space.

Posted 13 Sep 2013, 09:24 #13 


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