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348 Door Locks

Discussion in 'Technical Q&A' started by Mike Hodson, Nov 14, 2022.

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  1. Mike Hodson

    Mike Hodson Rookie

    Apr 2, 2019
    2
    Full Name:
    Michael Hodson
    #1 Mike Hodson, Nov 14, 2022
    Any help is appreciated. I took my 1994 348 Spider out with a friend this weekend. When we returned and exited the car, the passenger door would not close, almost like the latch was still in the closed position. I used the unlock button and managed to get the door closed, however, it now will not open at all. I do not think there is a cable issue, as I can still feel tension when I use the indoor release handle, but the door will not open. Also, when I now try to unlock the doors, either with the key or button, the locks cycle unlock, and then immediately lock again. When I manually pull the driver's door lock up and open the driver's side door, the door opens fine, but then the locks just keep cycling up and down until I close the driver's side door, and then they go into the locked position and quit cycling.

    Any help is appreciated!
     
  2. Ferrarium

    Ferrarium F1 Veteran
    Sponsor Rossa Subscribed

    Jul 28, 2018
    5,728
    Central NJ
    Full Name:
    Eric
    #2 Ferrarium, Nov 14, 2022
    Qavion likes this.
  3. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,269
    Sydney
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    Ian Riddell
    #3 Qavion, Nov 14, 2022
    Strange. Normally if there is a latch issue, the doors will refuse to lock. When the doorlock actuator can't extend to lock (due to mechanical issues with the latch (or electrical or mechanical issues with the actuator itself), the system senses that the actuator isn't moving to the correct position and reverses the command. You seem to have the opposite. Note that the actuator has an internal switch for sensing extended/not-extended.

    Is there any way you can open the passenger door? e.g. try removing the fuse for the doorlock ECU (fuse 4 in the footwell) to override the electrics and use the key to unlock the door. At least that way you might be able to pull off the door card (and/or the door scoop) and inspect the lock assembly and linkages. Being able to open the door will also allow you to inspect the wiring at the door pillar as shown in Ferrarium's weblink.

    Image Unavailable, Please Login

    Door actuator shown in black (in the retracted/unlocked position)

    Wiring diagram here if you need it:

    https://www.dropbox.com/t/qhePNsawt3qiWkGs

    Link expires in 6 days.
     
  4. Mike Hodson

    Mike Hodson Rookie

    Apr 2, 2019
    2
    Full Name:
    Michael Hodson
    #4 Mike Hodson, Nov 14, 2022
    Unfortunately I am not able to open the passenger side door. I will try again this evening. The passenger door refused to close once before, but after I cycled the door locks, it closed with no issue. This is the first time the whole lock continuously cycling lock/unlock has happened. i will try a few other things to get it open this evening. Thanks for the input though.
     
  5. 348Jeff

    348Jeff Formula 3

    Oct 25, 2011
    1,531
    UK
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    Jeff
    #5 348Jeff, Nov 17, 2022
    What if you disconnected the battery to stop the actuators working then tried it with the key?
     

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