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Thread: Weird Noise ID Help - Driver Door

  1. #1
    Join Date
    Nov 2017
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    01' 740iSport

    Weird Noise ID Help - Driver Door

    Theres a weird noise every time I start driving. Its after the doors automatically lock. Thought it might have been around 25 mph but experienced some inconsistency with speed tests. Please listen to the video around 19 seconds.

    01' 740i Sport with DSC but very few other options (not sure that matters).

    https://youtu.be/kvaNqE7jGlU
    Last edited by jjthesavage; 01-13-2018 at 08:36 PM.

  2. #2
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  3. #3
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    01' 740iSport
    Yes and the noise only happens one time after a shutdown and restart.

  4. #4
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    Is it while you are shifting 1-2 at about 2.5-3k RPM?
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  5. #5
    Join Date
    Nov 2017
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    01' 740iSport
    I recreated it again leaving it in 2nd gear the entire time. It seems I need to power it down and unlock the doors to recreate the sound. First time the doors locked in the first 10 seconds and the sound occurred at about 61 seconds and 22mph. Second time I didnt get the noise as I did not unlock the doors before restarting. Third time the doors locked about 10 seconds into the drive and the sound happened at 15 seconds and 17ish mph. This is in my neighborhood so i got up to a max of about 27mph.

    Edit: It sounds very close like its in the driver door panel or possibly restrain system. Are these active restraints?

    Also probably wouldn't hurt to mention my auto door locks weren't working until I replaced my key with a new unit to get the keyless entry working. I had the noise before and thought it was some kind of actuator issue for my auto locks but the new key got that function working.
    Last edited by jjthesavage; 01-14-2018 at 01:45 PM.

  6. #6
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    Have you ruled out it just being the door lock actuator in the driver's door?
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  7. #7
    Join Date
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    2001 740iL Prod 4/2000
    Have the same noise, quiet 'mouse squeal' on first drive off. Haven't pinpointed it yet.
    I think it may be related to the system power check of the pre-charge pump on the left firewall,
    but I have not verified that yet.

  8. #8
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    Quote Originally Posted by racer2086 View Post
    Have you ruled out it just being the door lock actuator in the driver's door?
    I have not ruled it out entirely but since the doors lock before this sound, I'm not sure why the actuator would activate again.

    Quote Originally Posted by oldroller View Post
    Have the same noise, quiet 'mouse squeal' on first drive off. Haven't pinpointed it yet.
    I think it may be related to the system power check of the pre-charge pump on the left firewall,
    but I have not verified that yet.
    Hmm, interesting, "pre-charge pump". I'll need to look that up, never heard of that...

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