75ZT Community

Bernard · Posted 15 Jul 2011, 19:13 #1

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?

Raistlin · Posted 15 Jul 2011, 19:26 #2

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.

Bernard · Posted 15 Jul 2011, 20:33 #3

Yes, tried that as it would have been a classic fix.
I guess that almost any type will do to eliminate it.

Raistlin · Posted 15 Jul 2011, 20:37 #4

OK. It's in the car Bernard

Bernard · Posted 15 Jul 2011, 20:49 #5

Thanks Paul.

Bernard · Posted 19 Jul 2011, 20:25 #6

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?

Duncan · Posted 19 Jul 2011, 21:39 #7

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.

kandyman · Posted 31 Aug 2013, 20:24 #8

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 ?

Bernard · Posted 31 Aug 2013, 21:54 #9

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

kandyman · Posted 31 Aug 2013, 22:59 #10

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

Sent from my GT-I8190N using Tapatalk 2

Bernard · Posted 12 Sep 2013, 08:20 #11

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.

takestock · Posted 12 Sep 2013, 17:57 #12

Bernard wrote: We are in Spain for a month

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

Bernard · Posted 13 Sep 2013, 09:24 #13

...Just looking for a bit of sympathy, having to endure such privations.

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BCU problem? by Bernard