Pennock's Fiero Forum
  Technical Discussion & Questions
  Junkyard power windows and locks

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version

next newest topic | next oldest topic
Junkyard power windows and locks by Neils88
Started on: 09-01-2014 02:56 AM
Replies: 4 (1932 views)
Last post by: tshark on 09-01-2014 10:01 PM
Posts: 3987
From: Orleans, Ontario, Canada
Registered: Aug 2013

Feedback score: N/A
Leave feedback

Total ratings: 56
Rate this member

Report this Post09-01-2014 02:56 AM Click Here to See the Profile for Neils88Click Here to Email Neils88Send a Private Message to Neils88Edit/Delete MessageReply w/QuoteDirect Link to This Post
My wife has been (jokingly) complaining about my car not have power windows and locks (base 88). Since she went away for a girls long weekend camping trip, I decided to surprise her for when she gets back. This was more of a joke than a serious project, since next year I'll be pulling everything apart for a new body kit. The doors will get replaced at that time. In the mean time...I decided to see if I could install power windows and locks for a minimal cost. However...the problem is that there are no Fieros in junkyards locally. (and I was definitely not going to get new parts) decided to see what I could do using easily obtainable parts from the local Pick-N-Pull. For a grand total of about $35 and 3 days, this is what I came up with...

(This thread concentrates on the power windows install, but will show the power lock conversion too...)

First step is to take apart the door. The arrows below point to screws that need to be removed. Take note of the tiny set screw on the outside of the mirror adjustment lever.

Use a small flathead screwdriver and pry off the two covers to reveal two screws. Once the screws are removed, you can pull the door release cover plate back and reveal the rod to the lock. Unclip the plastic retainer from the rod, then the rod will pop off the lock lever. Once the rod is disconnected, you can remove the door release cover plate.

The handle has two large screws on the bottom side, and one small cover that needs to be pried off for the third large screw.

Hardest part of the whole conversion...getting the window crank off There is a tool for it, but of course I don't own it.

The clip is pictured below....just need to pop it off. You can try to use a couple of screwdrivers, but tough to get them in there. I found a piece of metal that slid in there flush to the door, just had to put it in position and tap it with a hammer. 10 minutes later....

The handle, door release cover plate and window crank are all removed. Now take a large flathead screwdriver and slowly work your way around the door (not the top). Gently pry all the plastic retaining clips from the door. Hopefully they all release with the door panel....but don't panic if they stay with the door when they separate. They can be removed after with some needle nose pliers and reclipped back onto the door panel. You need to be extra careful with the clip at each upper corner of the panel. These two are slightly different, they have a small metal spacer that is secured to the door panel. If (when) they break off, you can hot glue them back in place later before you reassemble the door.

If you are careful, you can probably remove the paper and reuse it. I'm leaving it off, but if I were worried about it, I would secure a piece of plastic back in place. A little extra work...but worth it. In my case, I pulled the paper off and threw it away.

Clean door ready to go.

Secure the glass using two c-clamps (one forward, one back) and some paper towel. ***DO NOT OVER TIGHTEN! LIGHTLY SNUG THE CLAMP ONLY!!!*** The glass isn't too heavy, and you can adjust the clamps easily if you need to during the conversion. Just be aware that you can't shut the door while the clamps are in place. You may want to disconnect the battery, or put it on a trickle charger...otherwise your battery will end up dead from the lights being left on.

There are 6 rivets that need to be removed. This bar (2 rivets) needs to be removed to give enough room for the window regulator to come through. This is the largest opening on the inside of the door. (I'll show how to remove the rivets in a moment)

The window regulator itself has 4 rivets.

The best way to drill them out is to drill 3 or 4 small holes around the perimeter of the rivet. Careful only to drill through the aluminum rivet, not the steel sheet metal underneath. (I tried my best, but made a few "extra" holes )

Use a pair of needlenose pliers, and put them into the holes that you drilled. Give the rivet a little turn to loosen it up, then you can smack the center out with a screwdriver and a hammer (light tap).

Now you can drill the center of the rivet out and then pry the remnants of the rivet off with a flathead screwdriver and a hammer.

Next remove the two bolts securing the lower window guide rail. The guide rail pulls out easily at this point.

The lower guide rail....

You can now pull the window regulator out of the opening in the door. This takes some fiddling, but it does fit. You'll need to slide the wheels off the upper guide rails. It's easiest to slide one wheel off the forward end and the other wheel off the back end of the rail. Just be slow and methodical and it will come out.

This is the standard GM window motor. You need ones that don't use the "guide wires". I took everything from a Chevy Montana (year ??). It's a pretty standard motor, and the gear has the same pitch as the Fiero regulator. Cost me $20 for two motors. I also grabbed the window and power lock switches from the drivers door ($5). I liked the look more than most other cars (I'll show a pic later).

This is the (manual) window regulator. Note that there is a torsion spring. It isn't under an immense strain...but enough to hurt you if you don't pay attention to it. Proceed cautiously and use some common sense as you go through the next steps.

I put a screwdriver into a hole just to make sure I could work on this without it springing apart under the strain.

Drill out the three rivets securing the manual crank mechanism.

Remove the screwdriver (carefully while holding pressure on the regulator) and slowly remove the strain on the torsion spring. It will turn about 180 degrees.

The torsion spring can then be removed for now.

Cut off the bushing plate, and grind both sides flat. You can test fit the motor until you get it to fit flush.

Weld on two plates (14 gauge steel) for motor mounting points.

Grind and dress the plates, and then drill two holes to mount the motor. You'll also need to make a small retaining plate. This will be used to provide a guide so that the gear stays meshed with the regulator. Without it, there is the risk of the regulator (under strain from the torsion spring) popping over the gear and springing open.

Insert the torsion spring. It will be under no load. (make sure you put it in the correct way around...everything on the driver side is mirror image to the passenger side).

Preload the torsion spring by turning it 180 degrees. Put a screwdriver back in place to hold steady for now. The exact position isn't critical for now.

Position the motor in place and put both bolts through (I used 1/4" x 1 1/2" bolts). ***Note: In the next two pics, the bolts aren't all correctly shown. It will be easiest to have the nuts on the outside of the door. You'll want the nuts in place for now (so you can put the regulator into the door), and then as you are positioning the regulator , you can remove the nuts and slide the bolts through the door panel sheetmetal, and then tighten the nuts on the outside.

The guide plate is critical to ensure the regulator doesn't pop over the gears and swing around under strain. Use 3 or 4 washers to provide a spacer for the guide plate. As mentioned before , the nuts are shown up, but the bolts should be reversed so the bolt heads are visible from this view.

The wires need to be moved from the lower securing hole to an upper hole. Conveniently there is a hole directly above the hole where the wires are currently secured.

You will need to use a grinder with a cutting disk to cut out the hole as shown in the picture below. This is to make room for the motor, which doesn't sit completely flush with the door panel. You will also need to drill one hole for the lower motor retaining bolt. (I actually did it once the regulator was in place since it was easier to measure exactly where the hole had to go).

You may also need to cut a small corner off the glass stop, as it may bump into the motor. (Mine did on the passenger side, but not the drivers side....I cut the same notch on both anyway.)

The window regulator can now be reinstalled back through the hole. Once it is inside the door, start by installing the wheels onto the upper guide rails. You may want to lower the glass about 4-5 inches to make it easier to get the wheels into the rail. Once the wheel are on the upper rail, you can install the lower rail (two bolts). It may be necessary to slide the regulator back and forth the get the lower rail in place.

Once the wheels are in the upper rail, and the lower rail is installed, the regulator can be positioned. You will need to remove the c-clamps and shift the glass up or down to get the regulator bolts to line up. Use 1/4" x 1/2" bolts with a washer. The will fit into the rivet holes without modification. The two lower holes already have bolts holding the motor to the regulator....just carefully slip off the nut and slide the bolts into the holes. Make sure the regulator doesn't pop over the gear while you're getting things lined up.

Once you are happy, you can install the stiffener bar (the one that had two rivets that were removed). Use 1/4" x 1/2" bolts with a washer.

Everything ready to go. The wires have been run through the door jamb. All connections are soldered with heat shrink tubing.

Also note a door lock actuator has been installed. A support was welded to the stiffener bar and a linkage was created to connect the actuator to the door lock rod. The actuators were taken from a Toyota Corolla.

The window and door actuators have been tested directly to power. Everything works great!! The door lock actuators are surprisingly quiet, and the windows open and close quite quickly. The next step is to finish running the electrical to the fuse block, through the switches and appropriate relays. I'll finish this up tomorrow and post the results.
IP: Logged
System Bot
Posts: 4292
From: Shelby Twp Mi
Registered: Sep 2002

Feedback score:    (7)
Leave feedback

Total ratings: 102
Rate this member

Report this Post09-01-2014 07:05 PM Click Here to See the Profile for RCRClick Here to Email RCRSend a Private Message to RCREdit/Delete MessageReply w/QuoteDirect Link to This Post
Great build thread.

IP: Logged
Posts: 542
From: Seattle,WA, USA
Registered: Dec 2011

Feedback score:    (7)
Leave feedback

Rate this member

Report this Post09-01-2014 09:04 PM Click Here to See the Profile for PonnariSend a Private Message to PonnariEdit/Delete MessageReply w/QuoteDirect Link to This Post
Very nice write-up! I'm getting ready to do the same mod. Your info greatly appreciated!
IP: Logged
Posts: 3987
From: Orleans, Ontario, Canada
Registered: Aug 2013

Feedback score: N/A
Leave feedback

Total ratings: 56
Rate this member

Report this Post09-01-2014 09:45 PM Click Here to See the Profile for Neils88Click Here to Email Neils88Send a Private Message to Neils88Edit/Delete MessageReply w/QuoteDirect Link to This Post
The door panels are back on. I'll need to find something to cover the hole

The wires were actually easy to run. I left enough wire to be run under the dash and to reach the center console on both sides.

Now to start taking the center console apart. The trim is held on by 4 bolts, and the gear shift knob is screwed in place.

3 more bolts hold the switch cover plate.

There's actually lots of room below the cover plate. The other big concern is whether the gear shift linkage could snag on wires. Looks like there should be enough clearance.

5 bolts for the console surround, and another 4 bolts for the stereo. This gives lots of room for passing wires. There are two relays required for the door lock actuator control, these fit perfectly in the space in the center console below the stereo.

I liked the look of the driver side window and lock switches from a 2005 (??) Pontiac Montana. I think they all cost me about $4.

The best thing about the window switch is that it has all circuitry built in and is easy to use. The switch has built relays, and has the auto down function for the driver's window. The power door locks do require 2 standard automotive relays.

The wiring from the switches is simplistic. The power requirements are a 30A, 12V supply that turns on with the key, and a 20A, 12V supply that is constant supply. Both of these should come right off the fuse box. There is a free spot with a large gauge wire that can be used for the power windows. For the door locks, I just tapped into the hazard light circuit.

Now that the wires are all run, I have discovered a problem with the door lock actuator circuit (the power windows work perfectly). The door locks only work in one direction. After some troubleshooting I discovered that the switch itself isn't working correctly. When the switch is pushed, it completes the relay circuit. It appears that in one direction it has a resistance of about 68 ohms. In the other direction, it has a resistance of about 250 ohms. This must be too great for the relay to work. I've taken the switch apart and cleaned it, but to no avail. The next time I am near the Pick-N-Pull, I'll grab another switch. Hopefully I can find an equivalent switch.
IP: Logged
Posts: 4374
Registered: Feb 2014

Feedback score:    (6)
Leave feedback

Total ratings: 64
Rate this member

Report this Post09-01-2014 10:01 PM Click Here to See the Profile for tsharkSend a Private Message to tsharkEdit/Delete MessageReply w/QuoteDirect Link to This Post
Very nice write-up!
IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay

Copyright (c) 1999, C. Pennock