how long can you hear the pump running for?
If it's over 3 or 4 seconds you most likely have a vacuum/pressure leak in one of the tubes at the front doors, the pump connector/s or the junction behind the drivers seat.
Your 97 A4 should have a vacuum controled boot lock, and standard 'one touch' unlock of all doors and boot.
Has the battery been disconected recently?
Are you using a different key than normal?
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