Problem: APS 30 installed in W210 turns off?

[RodH]

Hi, I just installed an APS30 in my 2002 E-class wagon but it's not working quite right. Anyone recognize what's going on here:

It works fine with the ignition off, but turns off when I start cranking the engine.

If the engine is already running, it can't be turned on until ~45 seconds after key-off.

If it's on and I take the key to the run position (#2) without cranking it, it continues to work without turning off.

I've noticed when the unit's off, and the parking lights are on, the unit's "on" button illumination goes out a few seconds after starting the engine.

So any known cure?
If not, any ideas of further tests/resets/measurements that's be useful?
Thanks,
Rod

[RodH]

Fixed! - fuse #10 had blown - I measured the switched supply at A7 and it was dead so I started looking at fuses.

I guess the CANbus was not sending the right signals as the steering wheel buttons were taken out by the fuse.