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Thread: Seatbelt warning light/buzzer

  1. #11
    Senior Member gulwng3's Avatar
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    Quote Originally Posted by Rich View Post
    Reference information, for those who have not already disconnected the seat belt warning module and care about the factory said it was supposed to do, directly from the DeLorean Owner's Handbook, p. 8:

    INERTIA SEAT BELTS Fig. 8
    Warning System
    The seat belt warning light Fig. 8 will glow
    when the ignition is switched on and either
    seat is occupied with the seat belt
    unfastened, a warning buzzer will also
    activate for approximately ten seconds.
    Yah, I read that in my owner's manual, but not sure it is correct.

    1) The seat belt warning light only comes on a few seconds after the car is started, not when the ignition is turned to the on position.
    2) Not sure why it makes a difference if the passenger seat is occupied since there are no wires in the passenger seat belt connector.
    3) The seat belt warning light will glow whether the driver's seat belt is fastened or unfastened (at least that's what some of us are experiencing).

    Andy

  2. #12
    Senior Member WelmoedJ's Avatar
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    Quote Originally Posted by gulwng3 View Post
    Yah, I read that in my owner's manual, but not sure it is correct.

    1) The seat belt warning light only comes on a few seconds after the car is started, not when the ignition is turned to the on position.
    2) Not sure why it makes a difference if the passenger seat is occupied since there are no wires in the passenger seat belt connector.
    3) The seat belt warning light will glow whether the driver's seat belt is fastened or unfastened (at least that's what some of us are experiencing).

    Andy
    IMO the info in the Owner's Manual is incorrect, at least regarding the passenger seat.
    The "seat belt warning system" also doesn't detect occupation of either seat (no detection device in the seats themselves).

    As far as I have learned and found the buzzer and seatbelt light only have two functions (for the subject):
    - detect an open door and sound off: if the ignition key is in the lock AND/OR the engine is running.
    - detect an unused seat belt and show light and sound of for a short period of time: if the ignition key is in the lock AND the engine is running.

    Should your buzzer not function in such cases or sound off all the time, check the wiring to the appropriate buzzer pins.
    There may be a switch in the wiring to the door ajar and door light causing this behavior.

    FYI: I found that, although my wiring has been setup correctly, the buzzer replacment (chimer) also sounds with the door closed).
    That behaviour is because of the difference in intended operation of the buzzer vs the chimer.
    I have combined the wiring from door ajar switch and seat belt switch, this making both work if either is not grounded.

    P.S.: Perhaps the information in the OM has been correct for the first batch of cars.
    Later or before the first cars, it may have become obsolete due to time and lack of money.
    Then the factory no longer installed the passenger seat warning switch and forgot about the information in the OM?
    Welmoed
    Black D 1981-11 sold
    Toyota Prius III 2009-07 (sold)
    Mazda MX-30 (BEV) 2020-09

  3. #13
    Senior Member
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    Is there a "plug-and-play" modern buzzer available? The original has a terrible sound...

    Stian Birkeland
    Norway

  4. #14
    Senior Member WelmoedJ's Avatar
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    Quote Originally Posted by dmcnorway View Post
    Is there a "plug-and-play" modern buzzer available? The original has a terrible sound...

    Stian Birkeland
    Norway
    No, there's not a plug and play replacement.
    However I've used a GM chimer module used in a Pontiac TransSport (model 95).
    For that chimer I written a How To.

    Some other owners have used GM chimers of another of their brands and models.
    Finding a US GM car in a junkyard shouldnt be too difficult and the price probably is modest.

    There's only a slight difference in the connections.
    Check the GM pdf and compare with the setup of the buzzer signals.
    It may help you see the difference.
    Chimer - chimer diagram v2.pdf
    Welmoed
    Black D 1981-11 sold
    Toyota Prius III 2009-07 (sold)
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  5. #15
    Senior Member DrJeff's Avatar
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    Quote Originally Posted by WelmoedJ View Post
    Some other owners have used GM chimers of another of their brands and models.
    I did the GM mod and really like it. The only challenge was getting the seat belt light and buzzer to work correctly. I used Welmoed's for 90% of the how to.
    Jeff
    #6313 (lic: DMC-EV Texas), 25k miles, 100% leather, touchpad, 100% LED, dimmable LED dash, remote door lock & Elvis mod, all A/C vents in kneepads, wedgectomy, escutcheon velcro fix, GM door chimer, custom arm rest/storage/controls...

  6. #16
    Senior Member WelmoedJ's Avatar
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    Quote Originally Posted by DrJeff View Post
    I did the GM mod and really like it. The only challenge was getting the seat belt light and buzzer to work correctly. I used Welmoed's for 90% of the how to.
    Use the info on the GM diagram.
    The Delorean door ajar switch is between buzzer and ground on the ignition key (with NO key inserted).
    So two switches in one circuit, also being powered at the door ajar light or the light's lead is interally routed to the switches?
    (I have never looked inside the buzzer, so I'm not sure).

    The DeLorean seat belt warning consists of two circuits with their own pins.
    1. Power goes to the light, then to the buzzer and most likely to ground
    2. The power from the seat belt light supposedly is routed internally in the buzzer to the seat's switch (two pins used).

    GM's seat belt and door ajar lights are powered by the chimer module.
    Both signals only run to ground through the lights.
    Compare both car diagrams.

    Dave M. may have gone into the inner of the buzzer and may be able to explain the functionality much better than I can.
    I may be wrong in some assumptions, so don't take this info for granted.
    Welmoed
    Black D 1981-11 sold
    Toyota Prius III 2009-07 (sold)
    Mazda MX-30 (BEV) 2020-09

  7. #17
    Senior Member Bitsyncmaster's Avatar
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    I was going to build a device that has prerecorded messages but that project got sidelined. I never got to the point of working the door logic. I did pull the original unit apart but that had a very basic buzzer with some transistor, resistor logic inside. I just left it not installed.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  8. #18
    Senior Member DrJeff's Avatar
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    Quote Originally Posted by WelmoedJ View Post
    GM's seat belt and door ajar lights are powered by the chimer module.
    Both signals only run to ground through the lights.
    Compare both car diagrams..
    I rewired the seat belt light specifically so that it could be driven by the GM chimer module. I also implemented the chimer warning for the headlights being left on with the ignition off. That has saved my battery a few times. I don't mind the chiming because the sound is much more pleasant the the stock unit.
    Jeff
    #6313 (lic: DMC-EV Texas), 25k miles, 100% leather, touchpad, 100% LED, dimmable LED dash, remote door lock & Elvis mod, all A/C vents in kneepads, wedgectomy, escutcheon velcro fix, GM door chimer, custom arm rest/storage/controls...

  9. #19
    Linux Janitor novadmc's Avatar
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    I've had a similar issue with my buzzer as of late. now i have an issue where my buzzer starts going off when the driver door is shut. buzzer stops when the door opens. this has been happening over the past few days whether the keys are in the ignition or not. or whether the car is running or not.

    i took the buzzer out and cleaned the contacts (both on the harness and on the buzzer) and it seemed to be fixed. today while getting something out of the passenger side of the car, when i shut the passenger door, the buzzer started going off again.

    at this point I'm assuming the buzzer's internals are just starting to fail. i do plan to replace it, but my question is, is there anything detrimental to simply leaving the buzzer unplugged? I'd assume not but figured i would check with more knowledgeable minds.

    thanks!

  10. #20
    Senior Member Bitsyncmaster's Avatar
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    Mine has been removed for a long time and nothing bad has become of it.
    Dave M vin 03572
    http://dm-eng.weebly.com/

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