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Problems with locks and battery drain 200

posted by  PDXBRICK on  Mon Jan 30 09:10 CST 2006
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Hi, I have an 1988 240DL and have recently had problems with my battery dying as a result of the automatic locking system getting jammed and draining the battery while the car sits. Does anyone have any suggestions on how to troubleshoot this. My impulse is to simply disconnect the power to the system and manually lock and unlock the doors from this point forward. Thanks for any advice.








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    Problems with locks and battery drain 200

    posted by  Kane on  Mon Jan 30 20:00 CST 2006
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    Check the relays (typically behind the center vents) ... I've dealt with one that shorted out before.

    -- Kane
    --

    While I would never deliberately mislead anyone, take into consideration that any info and advice was provided at no cost to you.

    5 Volvos and a Roadmonster in SoCal, from '64 to '94. See profile for info.








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    Problems with locks and battery drain 200

    posted by  Trev29 on  Mon Jan 30 10:24 CST 2006
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    last visit: Fri Oct 17 05:56 CST 2014
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    One of the 2 switches (key,knob) is probably shorting.

    Pull driver's side door panel. Unplug connector that branches to both switches. Use multimeter to check for continuity between blk and red/grn even though switches not activated.

    If yes, use pin into wires to trace to which switch is the problem. Can disable switch by eg. cutting wire so that good switch is still operational. Or leave connector unplugged if don't need power locks.
    --
    1980 245 Canadian B21A with SU carb and M46 trans in Brampton, Ont.








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      Problems with locks and battery drain 200

      posted by  c_j_mooney on  Mon Jan 30 11:23 CST 2006
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      last visit: Wed Sep 14 17:39 CST 2011
      [RELATED]

      Almost certainly the switch around the lock cylinder sticking, or the insulation on the wires has biodegraded at/near that switch.
      --
      Chris, Dartmouth NS Canada 70 M-B 280SE, 83 245DL, 84 244 turbo, 90 780 turbo, 92 VW Golf, 90 740 Rex/Regina








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        Problems with locks and battery drain 200

        posted by  Cliff Pope on  Mon Jan 30 20:12 CST 2006
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        last visit: Thu Feb 3 05:28 CST 2011
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        I had this problem. It was the barrel-switch in line with the pop up knob on the driver's door. When its internal spring gets weak it contacts by itself.
        It is impossible to fix, you just need a new one.
        As a sort of semi-repair you can wrap coloured plastic tape around the knob to create a bit more friction in the door capping.







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