[Bali]

Year and model E46? Always state that to get proper help.

I would check the antenna, amplifier, and its connections.

Read up on Central Locking in this document, starting on page 16.

E46 GM5 Central Body Electronics.pdf

drive.google.com

 

[Bali]

The verts have it in the rearview mirror because there is no C pillar. Remove your C pillar and check.
The fugly Compact was never delivered to USA market, so we cannot help much here.