Strange electrical issue

Rover600 · 17th January 2021, 01:24

It’s a long shot, but I’m hoping somebody might have come across something like this before I have to dust of my DMM and dig deep into RAVE. It’s a very odd one.

The 75 tourer has been fitted with the mk4 dvd/satnav headunit by the previous owner.

All has been working well until one day it stopped picking up FM radio – didn’t think much about it at the time but shortly afterwards the battery was flat when I went out to start it.

Charged up the battery and all was well for a week or so and then again overnight battery went stone dead. Charged it again and noticed the on/off knob on the stereo only sometimes worked.

On the last trip, I started it up and noticed the splash screen on the stereo kept flashing on and off.
While driving it emitted a sharp intermittent crackle from the speakers and stereo wouldn’t turn off, then about halfway through the trip a number of things happened:

Indicators and hazards stopped working.
When engaging reverse the parking sensors no longer beeped
Climate control stopped working and displayed an E0 on the screen (I assume this is error).
Central locking no longer worked

After making it home and unloading the boot via the back seats, I started it up again to move it and suddenly everything started working again.

My first thoughts are the stereo is the obvious contender for further investigation and I could imagine if this has a fault and has been staying on it could flatten the battery – however, failure of all of the other systems is more worrying.
Initially I assumed a fuse may have gone, but the fact everything came back now makes me think perhaps something like a dodgy earth or possibly even something bizarre like an alternator fault.

The last time I encountered such a weird fault was due to a shorted tailgate wiring loom on a 25.

This is our first 75, and although I have had quite a bit of experience with Rovers in the past, I’d be grateful if anybody has got any thoughts or come across anything similar before.

Rover600 · 17th January 2021, 01:34

I should also add, the only thing I can see that links all of these together is the BCU, but I'm not sure how this would be affected by the stereo.

Are these known to go bad?

SD1too · 17th January 2021, 07:20

Quote:

Originally Posted by Rover600

... the only thing I can see that links all of these together is the BCU, but I'm not sure how this would be affected by the stereo.

A K-bus connection probably John.

Simon

17th January 2021, 01:24	#1
Rover600 Newbie Rover 600 Join Date: Nov 2017 Location: Norfolk Posts: 12 Thanks: 0 Thanked 2 Times in 2 Posts	Strange electrical issue It’s a long shot, but I’m hoping somebody might have come across something like this before I have to dust of my DMM and dig deep into RAVE. It’s a very odd one. The 75 tourer has been fitted with the mk4 dvd/satnav headunit by the previous owner. All has been working well until one day it stopped picking up FM radio – didn’t think much about it at the time but shortly afterwards the battery was flat when I went out to start it. Charged up the battery and all was well for a week or so and then again overnight battery went stone dead. Charged it again and noticed the on/off knob on the stereo only sometimes worked. On the last trip, I started it up and noticed the splash screen on the stereo kept flashing on and off. While driving it emitted a sharp intermittent crackle from the speakers and stereo wouldn’t turn off, then about halfway through the trip a number of things happened: Indicators and hazards stopped working. When engaging reverse the parking sensors no longer beeped Climate control stopped working and displayed an E0 on the screen (I assume this is error). Central locking no longer worked After making it home and unloading the boot via the back seats, I started it up again to move it and suddenly everything started working again. My first thoughts are the stereo is the obvious contender for further investigation and I could imagine if this has a fault and has been staying on it could flatten the battery – however, failure of all of the other systems is more worrying. Initially I assumed a fuse may have gone, but the fact everything came back now makes me think perhaps something like a dodgy earth or possibly even something bizarre like an alternator fault. The last time I encountered such a weird fault was due to a shorted tailgate wiring loom on a 25. This is our first 75, and although I have had quite a bit of experience with Rovers in the past, I’d be grateful if anybody has got any thoughts or come across anything similar before.

17th January 2021, 01:34	#2
Rover600 Newbie Rover 600 Join Date: Nov 2017 Location: Norfolk Posts: 12 Thanks: 0 Thanked 2 Times in 2 Posts	I should also add, the only thing I can see that links all of these together is the BCU, but I'm not sure how this would be affected by the stereo. Are these known to go bad?