V70 CIM issue central locking

[Alan E Howard]

Hi all, I have an 02 V70 that has developed a fault with the central locking.
When I use the key fob to open the doors it continues to click open and closed. It started by rectifying itself after a few minutes but now it continues until the battery runs down. My garage tried disabling the central locking suggesting I use the key, but the CIM unit still kicks in, running the battery down, even tho it’s not connected to the locks any more. Apparently I need a new CIM unit that can only be done by a main dealer, this is going to cost me around £900 all in.
Apparently I can’t get one from a breakers and reprogram it... Can anyone suggest a cheaper fix that’ll keep the car secure?
Thanks in advance.
Alan

[ASt85]

It is just possible that the fob button is sticking and "cycling" the unlock state, and if you are close by will continue to cycle the lock - you could try removing the battery from the fob after unlocking to rule out a fob related issue.

Do you have a second fob to try?

If it is fob related you could try cleaning the offending fob with isopropyl alcohol aka switch cleaner; it sorts out a lot of fob related problems.

You might consider replacing the Central Locking Control Unit - it's located under the offside lower dash and slides off a black powder coated locating bracket- probably a black or just possibly a green plastic unit (both have two multi plug connectors) in your V70 - the bad news is that the unit is coded to your key fobs - so you'll be looking for a unit with key fobs - try Minty on the forum - NB the fobs are factory coded to the unit but the unit is a direct swap and won't need to be re-coded to your car - check the part number on yours before sourcing a replacement as there are two different types fitted depending upon year/model/spec & etc..

[cheshired5]

Originally Posted by Alan E Howard

Apparently I need a new CIM

Your car has a CEM and a DIM but what is a CIM?

[ASt85]

Originally Posted by cheshired5

Your car has a CEM and a DIM but what is a CIM?

Hi "Cheshired5" - I'm sure the poster means the Volvo CEM- CIM is a Vauxhall/General Motors as well as Saab abbreviation for the module that controls the electronics inside the car/dashboard/locking etc. apparently it is usually located in or near the steering column - I assume it equates to the Volvo CEM - as usual, I defer to your wider knowledge on these matters

[cheshired5]

My thought is that based on the symptoms and the year of the car, a DIM fault is more likely and although it's "just" the instrument cluster, its influence on seemingly unrelated functions is quite broad.

Given the cost of guessing either a CEM or DIM or other module fault, hooking up with Vida would shed much more light on the situation.

[ASt85]

Originally Posted by cheshired5

My thought is that based on the symptoms and the year of the car, a DIM fault is more likely and although it's "just" the instrument cluster, its influence on seemingly unrelated functions is quite broad.

Given the cost of guessing either a CEM or DIM or other module fault, hooking up with Vida would shed much more light on the situation.

Thanks "Cheshired5" - Absolutely agree - Vida solves most of these issues.