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Thread: Help With Power Locks

  1. #1
    Join Date
    Aug 2015
    Location
    Western Washington county, Maine
    Posts
    51

    Question Help With Power Locks

    1989 Jeep Cherokee Laredo - most of the power option are non-functional thanks to the previous owner.
    In this thread I am seeking help with power locks.
    Alright -- none of the power locks worked. Right-front window does't work, two rear windows only work from master switch. Last week I replaced the master control switch on driver's door. Now only thing improved is right-front power lock works. The replacement switch made no other difference.

    Where should I look next to solve this. I would especially like to have the hatch lock working.

  2. #2
    Join Date
    Dec 2011
    Location
    Three Oaks
    Posts
    458

    Default Re: Help With Power Locks

    Not real familiar with that version of the system, but the latter systems like the 2000 had issues with the wires breaking between the chassis and the doors. You may have to splice in new wires, as needed.

    And YES ! It's a PITA !

  3. #3
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Help With Power Locks

    This is a situation where you need to pull the door panels and start checking wires and such. If you don't have a volt meter, a test light and jumper wires will help. One thing to start with is see if your locks are gummed up. The grease looses some of its lighter fluid over time and gets stiff. Some penetrating oil can free this stuff up and sometimes that is all it needs for the power locks to work. Also you can get broken wires at the boot between doors.
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  4. #4
    Join Date
    Aug 2015
    Location
    Western Washington county, Maine
    Posts
    51

    Default Re: Help With Power Locks

    So far only checked driver's door lock, its only getting ~1.5 - 2.8 volts to the lock motor. I checked the motor itself with 12v and it works fine. The rear door's locks I haven't gotten to yet, or the hatch.

    Do the lock motors work via relays, or are they directly wired?

  5. #5
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Help With Power Locks

    They work directly from the switch. Check your switch to see if it is getting 12V to it. It may not. But if so, sounds like the switch contacts are not good
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  6. #6
    Join Date
    Aug 2015
    Location
    Western Washington county, Maine
    Posts
    51

    Default Re: Help With Power Locks

    I guess I am misunderstanding something: If the driver-side (master switch) lock-switch is able to actuate the passenger door lock motor but not its own, how is that a result of bad contacts in the switch? Sounds more like a bad connector or three, probably buried under the dash.

  7. #7
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Help With Power Locks

    I have been where you are many times. The pins on the switch where the wiring harness plug in get corroded, or the switch contacts do and you get one or more door mechanisms failing
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  8. #8
    Join Date
    Aug 2015
    Location
    Western Washington county, Maine
    Posts
    51

    Default Re: Help With Power Locks

    The connectors to the switch are clean and bright. So you are suggesting the switch is bad which I just got, should I be taking the switch back? (I have never liked power locks/windows/seats.)
    This may require a trip to my auto-electric genius brother who is a wiz with this stuff.

  9. #9
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Help With Power Locks

    I would be checking current in and out of the switch at this point. You never know about new parts nowadays. I have gotten some bad ones
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

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