I am waiting for the pass front door lock actuator to arrive in the mail. Any time now.
Had similar issues with it. Be careful and DO NOT double lock the door. You might not be able to open it again if it fails totally. you will have to destroy the door panel in order to get to the actuator. My acuator worked intermittent for about 2 weeks, then gave up the ghost totally. I was in touch with a internet guru specialized on the door locks and the electronics involved. Give me a few hours until I'm home, and I can post some links. the page is somewhat obscore, but has some very interesting info concerning the door modules for diferent years.
Looking for a DIY? Parts? Check this out, it might be your ticket
TMS underdrive pullies - Stewart WP - PSS9 - Beisan Vanos seals - Zimmerman cross-drilled & Akebono Euro - Deka 649 MF - 55w HID headlights - 35w HID foglights - Hualigan double din - ACS (rep) alu pedals - Euro central storage console - Breyton Magic Racing staggered wheels - M5 bumper - M5 steering wheel - Tint
Stable: e39 M54, e53 N62 & Tribby