'06 XC90 No AWD after a few minutes of driving.

[baconkev]

Hi Everyone,

I have a '06 XC90, the AWD drive is causing me a bit of an issue. I'm trying to diagnose the problem and find the best way forward. I don't really want to shell out a load of cash on anything unnecessary :

Car drives fine, although it does take a little while for AWD to kick in. But after a few minutes, I get the orange triangle and 'Anti Skid Service Required'.

Stop the car, turn the engine off and on again. AWD works for another few minutes then the same message.

Plugged the car into VIDA:
BCM-0095 Communication between control units Communication problems with DEM (New Fault)
DEM-0006 Pump Faulty Signal (New Fault)
DEM-0007 Hydraulic pressure Faulty value (always been there and I think this is why AWD takes a second or so to kick in rather than being instant)

It might just be a coincidence but, just before the problems started I accidentally drained the battery completely flat and had to jump start the car using another car.

Have driven the car loads since but it doesn't seem to be getting a full charge, 11.7V. 14.4v when the car is running...

Anyways, I checked all the fuses with a multimeter, all good.
Disconnected the Haldex pump, checked resistance 3oms.
Connected it back up, started the engine, revved the car up a bit, back under and the pump seems to be working (it's making a noise)

VIDA seems to be able to connect to the DEM, I can see readouts from the pressure sensor etc...

I'm unsure where to go from here. Are there any more tests I can do? to see if its a fully pump/DEM/wiring?

Any info would be a great help!

Thanks

Richard