V70 Electrics issue - CEM, ECU or something else?

[Antroyd]

My first post on this forum so hopefully it's worded ok.

The following rather odd electrical issues all started happening at the same time on my 2006 V70 2.4D:

1. Ignition position 1 (which should be just stereo etc.) acts like position 2, with all the dash lights you would expect to see in position 2 (engine running)

2. When engine is running, turning the ignition back to position 1 does not stop the engine which carries on as though nothing had happened.

3. Turning the key to position 0 still does not kill the engine, though the stereo, lighter etc. does go off as expected. Even removing the key completely does not kill the engine, until after almost exactly 10 seconds when it does eventually decide to stop.

4. The windscreen washers no longer work - i.e. the pump not doing anything at all. Wipers are fine though.

5. The ABS warning light is constantly on with the message that the ABS system requires a service, which it doesn't.

6. DSTC Spin control has stopped working and will not engage.

7. The battery runs flat after several hours since there is something still live which should not be - I have to disconnect the battery every night to stop this. The battery is new and the alternator is fine, but this fault clearly suggests that even without the key in the ignition, the power is still being supplied to the engine or other parts of the car which are slowly draining the battery. The fact that the engine continues to run for 10 seconds would also suggest this.


I have sought professional advice from a Volvo Independent garage, and they were rather baffled but fairly convinced it was a CEM issue. Other advice I have had was that it might be the ECU.

So my question before I spend £1000+ fixing the wrong part is this:

Could these problems be caused by a faulty CEM?
Could this be an ECU issue instead?
Or could it be simply a faulty ignition barrel switch?
Or could it be something completely different?
Is there a way of diagnosing this to establish the exact cause?
Is a CEM repair worth considering or should I just replace with new?

Sorry for so many questions - I am a newbee at this forum thing.

If any of you knowledgeable Volvo experts could share your thoughts or experiences, I would be very grateful as I really can't keep throwing money at the problem, but the car is fantastic otherwise, runs beautifully and has only recently had a replacement gearbox and clutch, so I am extremely reluctant to get rid after all I have invested in it.

Thanks for your help people