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Yeah very true, does make it a long easier when you get to the box out bit for sure. Guess it also comes down to me being idle mostly :o and can't be arsed to remove the upper part of the gearbox mount, exhaust, hubs etc.
I've always gone for the drop subframe and box out the bottom option. I also never removed half of the things you have, the haynes manual agrees with you but I found a lot of the things it tells you to remove can be left in and worked around.
afaik you'll have to push the button every time.
Its a momentry switch which activates a function in the UCH to disable the ESP, you can't set it up to be permanently off, the only way maybe is through CLiP but i'm not sure as i've never seen one or had anything to do with them.
iirc these need a direct battery feed because of the amp in them, hence the box on the constant (yellow) feed its got a fuse in it. I think its this model that needs it.
Limp home mode will almost definetly be the ecu cover cutting through the loom tripping it into limp home mode. You need to remove the cover and repair (read tape up) the loom to stop it earthing/shorting.
Didn't think there was anything on the front wishbone? I haven't heard of/seen anything anyway, the height of the front shouldn't change its only the rear depending on weight in the back.
The UCH is the computer that controls all the cars auxillary systems like the lights, climate control, wipers, central locking etc. But you don't need to worry about that, its only an idea and it'd be the sensor on the rear axle that'd be the problem if any.
Could be the auto adjuster sensor on the back dying and telling the UCH that the rear ride height is changing so it adjusts the lights.
Then again could be a few things really tbh.
As is my understanding the TDC sensor is a hall effect device so the target on the flywheel induces a voltage in the TDC coil as it passes the sensor the ECU interprets this pulse and works out the crank position from it. From this it works out the cam positions so it knows what piston/cylinder...