4.8is Air Suspension Compressor Gets no power

[brucemillar]

Folks

I have searched and posted to no avail. My 4.8is has the Suspension Inactive Message on the display. The suspension is "inactive" this started with no warning (excuse the pun). Working one minute, failed the next.

* The car is not sagging. I do not suspect a leak.
* the ride height switch is NOT illuminated - suggesting the system is dead?

I have checked all the fuses I see listed, two in the boot and two in the glove box. I also replaced all four with new tested fuses. All are good.

* There is no power to the compressor.

On the right of the spare wheel there is large white loom connector for the compressor. If I check there? I have no voltage. Note: I checked this with the ignition on and all doors, including the tailgate closed (it gets warm in that space)

* If I take 12 volts from the battery and connect to the black wire on the white plug. The compressor fires up.

* I have checked voltage all the way to the compressor pump. There is none, zero, zilch.

* I have checked the fused links behind the rear seats on the left of the boot (blue box with white lid). Continuity is good on all of them and all have 12+VDC with ignition on.

Is there a fuse that I have not found? With the system completely dead? I am sure that I have blown link or fuse or relay upstream from the actual compressor itself - hence no power at the boot plug.

I have seen mention of a relay, but cannot find one in the compressor dome. This is four corner system as standard on the 4.8is and NOT the rear only system fitted to other models.

I need to know where the fuses and relays are that could be killing the power ahead of the boot?

How can I raise the car in an emergency?

I can get power to the motor but it does not seem to lift the car.