Power door locks inop
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 235
From: Bangkok, Thailand
Do your courtesy lights work? I just went through this on my 84 and the fuse for the courtesy lights also powers the door locks. Don't know if that's the case on your 90, but worth looking at.
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
Could be door lock switches,door lock actuators,burnt fuse(s),door lock relay if it has one,or wiring problem.Are both door locks inoperative when using either one-driver & passenger?Hearing any noise when pressing door lock switch from either side?When did they stop working?Nice these questions answered to proceed
Thread Starter
Instructor
Joined: Jun 2010
Posts: 248
Likes: 2
From: Avon IN
Both power door locks (passenger and driver) are inop. There is no noise when I press the switch on either door. As far as when they stopped working... I have no clue, they were inoperative when I purchased the car last week.
Pro
Joined: Nov 2005
Posts: 602
Likes: 0
From: North Bay Ontario
just another comment from experience...when I bought my 85, I was told that there was a battery drain in that circuit, so the owner pulled the fuse (actually it is a mini circuit breaker in the 85). Turns out there was a short in one of the sport seat toggle switches (same circuit) and when I replaced the shorted out toggle switch, everything worked including power door locks and no more battery drain.
Thread Starter
Instructor
Joined: Jun 2010
Posts: 248
Likes: 2
From: Avon IN
just another comment from experience...when I bought my 85, I was told that there was a battery drain in that circuit, so the owner pulled the fuse (actually it is a mini circuit breaker in the 85). Turns out there was a short in one of the sport seat toggle switches (same circuit) and when I replaced the shorted out toggle switch, everything worked including power door locks and no more battery drain.
How do I know if I have a small batter drain? I have checked the fuses and all seems good. I have yet to check the relays.
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Thread Starter
Instructor
Joined: Jun 2010
Posts: 248
Likes: 2
From: Avon IN
Okay so I replaced the relay and the fuse in the aux fuse box. When I use the power door lock switch on the drivers side everything works. Both drivers and passengers side door locks actuate. When I use the passenger side switch it blows the fuse in the aux fuse box... So it is clear to me it is not the actuator, what else could it be?
Burning Brakes
Joined: Dec 2008
Posts: 1,021
Likes: 7
From: Morgan Hill and Marina California
It could be a problem in the passenger's side switch,
or a short to ground in the wires from passenger's side
switch to the driver's side switch. Does the fuse blow
on both lock and unlock on the passenger's side?
or a short to ground in the wires from passenger's side
switch to the driver's side switch. Does the fuse blow
on both lock and unlock on the passenger's side?
Le Mans Master
Joined: Jul 2004
Posts: 6,228
Likes: 698
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
Intermediate
Joined: Jun 2019
Posts: 47
Likes: 2
Could be door lock switches,door lock actuators,burnt fuse(s),door lock relay if it has one,or wiring problem.Are both door locks inoperative when using either one-driver & passenger?Hearing any noise when pressing door lock switch from either side?When did they stop working?Nice these questions answered to proceed