I have just tried to do the earthing mod on my x18xe1, but I must have done something wrong.
I disconnected the -ve terminal of the battery
I spliced into the yellow wire going to the afm, and connected it to ground (theres a bolt behind the top left of the engine, near the timing belt, which already has some wires held in by it. I just attached this wire to it) and then went to reconnect the battery, but as soon as I do it theres a noise that sounds like a high pitched siren 'weeooo weeeooo weeooo' until I disconnect the battery again. It sounds like a car alarm, but the horn isn't sounding and the hazzards aren't flashing. The noise sounds like it is coming from the far passenger side of the engine bay, right at the back, though I can't confirm this.
I reversed everything I did, so it was back to how it was before I started, but the same thing is happening. I haven't tried starting the car yet because I don't want to do any more harm. Also, I can't drive around with what sounds like an alarm going off.
The doors will lock and unlock with the 'alarm' going.
Can anyone help? Please!