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These are all functions of the central locking system.
This year/model is susceptible to water intrusion into the Central Locking / Anti-theft control module. I recommend you go into the trunk remove the panels or trim to access the right rear corner below the right tail light assembly. There you should find the control module. Inspect for water and or corrosion on the electrical connecters. Typically what happens is the seal at the taillight fails (previous collision?) and water gets in. If this is the case you may have luck taking the controller apart, drying it, and cleaning the electrical contacts. If it has been like this for awhile you may need to replace the unit. Be sure and water test the trunk before returning the vehicle to service.
If you do not find water intrusion to be the cause of your concerns, the controller's on board diagnostics should be scanned for trouble codes and the diagnosis would proceed as indicated by the trouble code(s) retrieved. I would normally do this as part of my initial inspection, but realize you likely do not possess a capable scanner to access the system.
I hope that I have answered your questions and addressed your concerns. Should you have any further questions for me, please do not hesitate to ask.
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Sorry for the delay. My online service is down and can't look up the code. I will opt out, perhaps one of the other experts like Audiguru can assist you. Audiguru did point out that I gave the wrong location for the control module. In 2002 the control module was moved under the carpet on the driver's side.
Thank You and sorry again for the delay.
Thank you Jake for the referral.
I will start with the antenna issue.
Look for cracks in the antenna and replace with updated part.
Pull down the rear part of the headliner. It is just clipped in.
Model Old Part No:------ New Part No:
8E5 035 225D ----------- 8E5 035 225S
8E5 035 225B ----------- 8E5 035 225P
Now for the module.
The fault you posted does not come up as a valid fault.
Now if we expect water then you need to pull up the front carpet in front of the driver seat and check. Start by removing the fuse box cover on the side of the dash. then Unclip the small trim piece that is in the same area of the cover on the A pillar. Next remove the lower A pillar. There is a small cover in the side. Remove the cover and the screw behind it. Next pull up the lower trim. Remove the left dead pedal. fold up carpet. You will see a black box. The module is in there. Check for water damage and get back to us.