I think it would be easier t find the holy grail than to find the miracle diagram that will give you a simple answer to this problem without you having a good knowledge of electronics.
Here are some things that you need to think about.
Is there anything at all that led to the problem ? eg, adding or modifying any electrical part of the car, any repairs carried out to any part of the car, do you have an alarm, have you gone through deep water or hit a speed hump?
There is a video being uploaded for next week which shows the location of all of the control boxes but I can tell you now that this will not help to solve the problem because the symptoms you describe relate to multiple system problems and it is not likely that they would all fail at the same time unless you had a major power fault.
Is your battery fully charged and holding a good charge as a low battery can give weird faults.
Have you checked the connections to the battery are clean and tight?
Check as many earth points as possible for corrosion or breaks.
Finally, I have found that about 80% of electrical faults are down to recent or previous modifications which have not been carried out correctly.
Just an additional note, the thing I’ve found with this cars is thst most systems are independent of each other unlike modern cars, ie my power fold will operate independently, as will the ECS, the pop up lights etc.
But the part thsts strange is thst these cars lack a canbus system yet several systems seem to be causing faults with other systems.
Like the pop up lights seems to make the ABS light come on and pressing the fog lights seems to put a warning up for the temperature sensor in the exhaust
sounds more like a bad earth problem to me. I recall a bad earth on an old car on the rear lights. The earth was bad so the volts found another route ie through something else which shared the same earth point