I have a 1997 Audi A4, i am having problem on central locking, when i unlock the central locking from drivers side with a key, it is only unlocking the driver side door, all the three doors remains locked including petrol door and trunk. now i can not even put petrol on the car. can not open the trunk as well.
When i lock the car from the drivers side key, (if the passenger doors are unlocked, ), it is not locking the passengers doors

Same problem happened few weeks ago on a wet day, and the problem disappeared after one day of sunny weather.

any one had smiler problem?.... Thank you

 

Pull your trunk trim on the right hand side, the central locking control module is located there.
What happens is the the sunroof drain gets clogged up on the passenger's side an fills that little pocket up with water which is exactly where the central locking control module is.
Im sure you can figure out what you need to replace if you find water built up in there.

 

Thank you for the replay,

Can you please tell me where is the "trunk trim located"

Best Regards

 

Open the trunk. Look to the right. That is the right trunk trim.