wipers and alarm going off by themselves

[Rick-sta]

What voltage to you get across the battery terminals? I see you mention the car has been parked for a week or two. Just remembered when I first acquired my old ZTT it had a poorly battery fitted and would quickly drain to low voltage within days when unused. When the voltage dropped to being quite low, the bbus alarm would go off and the front wipers would be operating.

[macafee2]

Originally Posted by Rick-sta

What voltage to you get across the battery terminals? I see you mention the car has been parked for a week or two. Just remembered when I first acquired my old ZTT it had a poorly battery fitted and would quickly drain to low voltage within days when unused. When the voltage dropped to being quite low, the bbus alarm would go off and the front wipers would be operating.

ok thanks, I'll charge the battery.. that's easy.

macafee2

[dave lincs]

Originally Posted by macafee2

Hi Simon,
I have no idea what K-bus is.

macafee2

I would suggest you take the car to someone with t4 or someone who understands the electrical systems on the car or you could end up with more problems

Dave

[Matt_75]

Originally Posted by macafee2

Hi Simon,
I have no idea what K-bus is.

macafee2

This probably isn't helpful in solving your problem, but if you want to learn more about the multiplexing systems on our cars, have a look at the technician videos on YouTube.

https://youtu.be/wV54uy9AO0s?si=GpW_l2Y8dKOUXL0P (overview of multiplexing starts at 6:38)

https://youtu.be/0X-vywwUSvs?si=uL88hTmlGoT1aGPV (more detail on the systems)

[SD1too]

Originally Posted by macafee2

Hi Simon,
I have no idea what K-bus is.

It's a single wire linking various non-engine related equipment. The BCU (Body Control Unit) sends coded messages along this single circuit. If a poor connection occurs or if equipment controlled by it develops a fault, unpredictable and random effects result. As Matt says, the name for this system is multiplexing and as Dave says you'd be best off seeing what T4 has to say (if anything) about it.

Of course the fault might not lie with the K-bus so do try Rick's suggestion first.

Simon

[T-Cut]

Originally Posted by macafee2

The windscreen wipers have started up and the car alarm has gone off on my 2005 CDT.
I have checked the plenum and that is fine.
For now I have disconnected the battery. The car has not moved for a week or two but there was heavy rain last night.
Any pointers on where to look please?

That rang a bell: https://www.the75andztclub.co.uk/for...d.php?t=316993
Maybe a clue in there?


TC

[macafee2]

I refitted the battery today after it being on charge since I started the thread and have not had any problems so thank you to Rick-sta
for the pointer

macafee2

[SD1too]

Originally Posted by macafee2

... thank you to Rick-sta
for the pointer.

It's good to hear that it was a simple solution Ian.
Try not to let your battery discharge again. If you're not using the car much I'd recommend investing in a smart charger which you can safely leave connected 24/7. There are many types to choose from but C-tek are particularly compact, simple to use and high quality. I use mine especially during the winter months.

Simon

[macafee2]

Originally Posted by SD1too

It's good to hear that it was a simple solution Ian.
Try not to let your battery discharge again. If you're not using the car much I'd recommend investing in a smart charger which you can safely leave connected 24/7. There are many types to choose from but C-tek are particularly compact, simple to use and high quality. I use mine especially during the winter months.

Simon

Hi Simon,
Yes, seemed an easy fix thank goodness. I think the amount of rain has stopped me running an extension lead out to the car to keep the battery charged.
Currently unable to get the car under cover.
I could remove the battery again and keep it connected.
I have 2 spare batteries that I keep charged.

As the song goes, should have known better.

macafee2

[Rick-sta]

Originally Posted by macafee2

I refitted the battery today after it being on charge since I started the thread and have not had any problems so thank you to Rick-sta
for the pointer

macafee2

Glad to hear. Fingers crossed that's the end of the issue