V70: Information What is the "ECC"?

[Clan]

Originally Posted by Jinxie

Could be. Either the siren or the ECC; they're both fed off this one fuse. Weather's pretty horrible today so I'm going to investigate further tomorrow and Friday. Try to find some point after the fuse where the two circuits diverge and test them individually. A simple resistance check should quickly show up which of them is at fault. Hopefully it'll be the siren, because I don't bother locking the car up here on this island and indeed most people here don't either. I can just yank that feed out of circuit and get on with something more fulfilling.

does the siren work? might save some time ! The wiring does not work like that it is a computerised muliti-network system .. would be helpful to see the wiring diagram ..

[Jinxie]

Originally Posted by Clan

does the siren work? might save some time ! The wiring does not work like that it is a computerised muliti-network system .. would be helpful to see the wiring diagram ..

Neither the siren nor the ECC will work when a new fuse blows straight away. I suppose it could be argued that since the siren is only ever rarely activated the most likely cause of the problem lies in the ECC, but there are few certainties these days what with MUX and stuff making simple things unduly complicated.

[Waynedance]

Do you ever get the "alarm system service needed" or something like that pop up?

The siren is a common fault, the internal batteries leak.

[Jinxie]

Originally Posted by Waynedance

Do you ever get the "alarm system service needed" or something like that pop up?

The siren is a common fault, the internal batteries leak.

I do get "alarm system service required" or something to that effect, yes. But it doesn't come up every time I start the car like the "screen wash low" warning does.

Is the battery leak from the siren something that could be easily inspected?

[Waynedance]

I did not get the warning when switching on, I think is was when putting ignition on only or something I forget now.

The siren is in the bulkhead and sealed, I just replaced mine but did cut the old one open and yes the batteries had leaked and melted the circuit board. I would be sure yours would be the same if you get that warning and it's the original one.

Located under the scuttle panel (engine bay where wipers sit) more on the passenger side, easy to get to and replace.

https://www.volvopartswebstore.com/s...rimLevel=24667

Number 2

[Jinxie]

Thanks for the tip. I shall duly check it out.

[Tatsfield]

+1 for the siren unit. It seems to be a weak component. Its internal battery is like a long term self destruct timing unit. Sooner or later it seems to kill it self. In my case it was after 6 years.