How to Replace a Window Motor and Test the Switch
For those of us who have owned vehicles with manual windows and have had to hang
over the passenger side trying to roll down the window to talk to a friend as you
leave from the curb, power windows are a blessing. But when electric windows stop
working where do you look? The window is controlled by four main parts; the window
motor, the window regulator, the part that holds the window and the control switch.
When you move the switch one way or the other, an electrical current is sent to
the window motor forcing the window to go up or down depending on the direction
of the switch.
Most window control systems are powered by a
fuse or thermo fuse. A thermo fuse
will cut power to the window circuit if too much
electrical draw is being
used. This serves as a safety device and helps keep the wiring from overloading
due to over usage. Always wear protective safety goggles and gloves before work
begins. (Warning: some electric window regulators are equipped with a helper spring
that can have tension, use caution when disassembling)
Step 1 - Removing Door Access Panel
Remove Door Handle Bezel
First remove all plastic access panels and screw hole covers.
Step 2 - Remove Control Switch Panel
Remove Window Switch Panel
Pry gently to remove the switch panel, (do not break). Removing the switch panel
is different in all cars. Some vehicles don't have a switch panel because it is
built into the door panel.
Step 3 - Disconnect Electrical Connector
Remove Window Switch Connector
After the switch panel is removed, release the connector safety and disconnect
the electrical connector.
Step 4 - Removing Door Panel Mounting Bolts
Locate and Remove Door Panel Bolts
Locate and remove all door panel mounting bolts and-or screws. Some door panels
use plastic push style fasteners. After all door panel fasteners have been removed
gently pull up and-or out on the panel and remove it. Remove all electrical connectors
to fully separate the panel from the door.
Step 5 - Remove Plastic Insulator
Removing Plastic Door Panel Cover
Most car doors have a weather and sound insulator which when pulled back, will
expose the inner workings of the door. In this photo you can see the door lock manual
control rod.
Step 6 - Release Window Motor Electrical Connector and Identify Components
Remove Window Motor Electrical Connector
Prepare for electrical circuit test. Release the safety clip and remove electrical
connector.
Step 7 - Testing the Window Motor Electrical Circuit
Testing Window Electrical Circuit
Reconnect the window control switch panel. With the electrical connector disconnected,
insert automotive test
light (test light is grounded to body) into either side of the connector. Turn
key to the on position (do not start the vehicle). Actuate the switch in both directions.
The test light should light up in one direction. Repeat this operation for the remaining
electrical terminal. Next, switch the test light lead to battery positive and repeat
test. The test light should light in both directions but on opposite sides of the
connector.
Step 8 - Taping and Holding Window in Place
Tape Holds the Window Up While in Service
You must tape the window to prevent the window from moving. We use masking tape.
This is used to keep the window in place while the window motor and regulator is
removed. If tape or some other means of holding the window is not used, the window
could slide down and cause damage or injury.
Step 9 - Removing Window Motor and Regulator
Removing Window Regulator Mounting Bolts
Remove all window mounting and regulator mounting bolts.
Step 10 - Remove Window Regulator
Removing Window Regulator
Remove window regulator after all of the window and window regulator mounting
bolts have been removed.
Step 11 - Identify Window Regulator
Match Old Window Regulator to the New Unit
After the window regulator has been removed thoroughly inspect and match the
old window regulator to the new window regulator. Make sure all mounting bolts and
window motor are in the exact same location. Reinstall new window regulator and
reassemble door. There are minor adjustments for the window rails to reposition
the window. Check the window operation and look for hard spots and clicking noises
when the window is traveling up or down. A minor adjust may be required.
If further assistance is needed, our certified car repair technicians are ready
to answer your car questions. Also, gain manufacturer
specific instructions and information by clicking -
Auto Repair Manual
Common Problems
- The window motor shorts out and stops working or works very slowly
- The window control switch short circuits due to excessive amperage draw
Related Car Repair Information
