Electric windows and central locking wont work first thing until car has been drove for a while A4 tdi audi 2001

comfort control module.

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

If it is cold enough the mechanism could be frozen. If not the actuator is gone and will need to be replaced.

Either a fuse problem or could be a twist in the electrical cable in the door joint . Sometimes chafes the outer core away and causes shorts in stuff like this .

Hello Patrick,

I have worked for Audi and Volkswagen for about 6 years. So you can call me on 776 0508, im based at beau bassin.

For your problem, i think it is your throttle valve.

Hope to hear from u soon

Cheers
Michael

check main plug for door

now disconnect only the negative side of the battery while the ignition is on, but engine off. After 3 minutes connect the negative, start the car and see if they perform. if not, locate the fuse for your power windows, it might be blown.
hope this helps.

is their a key slot in the door handle hidden by a plastic cover

I had the same problem with my 2002 2.5 tdi, i spent weeks looking for the fault an found it to be 2 broken wires inside the drivers door rubber wiring loom ( near door hindges ). it was causing same fault no int/light - no central locking to drivers door - no electric windows.
i managed to repair wires and it now fine..

get a scan done on the central convenience that will give you a code to start with,but it sounds like a controller fault

This is a common problem with your shape A4, pre 2001 A4s and old shape A6s. Rain water builds up in the area under the bonnet where your battery is. This can be accessed by removing the long black trim under the windscreen covering the battery. This area has two drain holes with small rubber tubes on it, these tubes get blocked over time by leaves, dirt etc. They need to be unblocked, and the tubes can be completely removed (and left off). This is much easier to do underneath the car but at least one can be done from the top. Its under the battery though. Be aware when you disconnect the battery, you will lose your radio coding.
It needs to be done though as if the water is coming in the car then it must be high. The water has most likely damaged your convenience control unit (electronic control unit) under the carpet of the footwell, this controls the failed electrical items you described. The water can cause further problems, electrical as it submerges the battery! And brakes as the brake servo can **** the water in causing many problems! Well worth getting it out sooner rather than later. Hope this helps and hasnt scared you too much. Good luck