Still have a problem with 99 S-10 Blazer(power windows).
Well no luck with the switches. I think I have a ground problem. I can open one door and nothing happens. If I open the drivers door and one other door everything works fine. Another problem when the doors are closed is the power mirrors don't work. Now I have a new problem to go along with the other two. The reverse lights stay on all the time now. This just started 10/02/08. Is there any grounding straps or wires that may be loose on the doors? Thanks for any help.
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A wiring problem or the driver's master switch, probably. Check for broken wires in the harness going into the driver's door opening. A dark green wire is the power wire to the switch (from a 30 amp circuit breaker in the relay block). and a black ground wire from the switch going back into the cabin.
Pull the master switch out and check for power on the dark green wire at the connector, with key on. If no power, wire may be broke from the circuit breaker to the switch, probably in the door opening. If power is good, check the ground circuit from the switch connector to ground. Like this: voltmeter positive lead on the green wire terminal with key on, voltmeter negative lead on the black wire terminal. If voltmeter registers battery voltage, power and ground is good. If no voltage shows on voltmeter, power or ground is bad. Move voltmeter negative lead to a good ground on frame or body. If voltage shows, power is good and ground is lost-look for broken black wire in door opening. Check for the black ground just inside the cabin from door-maybe under the driver's kick panel.
If both power and ground is good to the master switch, try a new or used master switch.
There is a rubber boot that goes from the body to the door. Inside that boot there are the wires for speakers locks windows, etc. If the power window wire is pinched or partially cut then that would be your fix. Your Main window switch that can control all the windows from the driver's seat is that hub for all the power that goes to each other door and window as far as power windows is concerned. Not sure as to why both front doors would have to be opened to open the front windows. If both doors are having a problem then you may have a problem inside the wiring boot in between the body and each door so check both. This is a common problem with a lot of vehicles with power windows. Good Luck.
Why does everyone think that power windows have relays? Well, maybe Volvos do, but most cars use a circuit breaker at the fuse panel. You need top pull off the driver's door master switch and check if there is one hot wire there to switch with the key on. If you don't, check for broken wires in the door opening. Check if the circuit breaker's terminal has power to it. When all windows fail, it is usually a wiring problem, not the switches or the motors, but all of them may need checked. If you have a hot wire to the master switch, you will need to check the power window's ground-it originates at the master switch and goes back into the cabin, then to a nearby ground. This is the set up for most cars, I suspect your is the same. If hot wire to master and good ground, it could be a failed master switch, but check carefully for broken wires in the door opening.
Is it making any noise at all when you push the button? If it is making noises, then you probably have a broken window regulator. If is is not doing ANYTHING, then you probably have a bad switch or a bad window motor.
You can find out which it is by popping the switch out of the door and checking for power and ground at the switch connector. (back-probe the connector with it still connected to the switch)
The circuits to the driver's door motor are Connector C2 - DARK BLUE Pin "A" and BROWN Pin "E" (C2 is the Long, 8-pin connector)
BOTH of these wires shouldbe GROUND when the switch is in the NEUTRAL position. Then with the ignition switch ON, the BROWN wire will switch from GROUND to POWER when the switch is pushed "DOWN". The DARK BLUE wire will do the same when the switch is pushed "UP".
If these are not doing as described, replace the switch. If they are switching properly, then you need to check for power and ground at the motor connector. - chances are it needs a motor, but you need to check the power and ground just to make sure you do not have a broken wire between the switch and the motor.
First, check the fuses. They are on the side of the dash...open driver door all the way, and pop open cover with a scewdriver. A card inside and a diagram on the cover will tell you the right fuses to check. They also have relays. Those are located behind the fuses, but not sure how to check them. Hope it is a fuse.