Question about 2002 Chevrolet TrailBlazer

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Master switch door

Complete switch will not work. Have check with a voltage tester and it is getting power. do i need to replace switch or is it something else

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It depends on how far you have troubleshot. It says master switch, this is the one on the driver door, correct? If so the does the window move with the switch on the door not the master switch (drivers door). If it does move with one and not the other its probably the switch or a wire possibly a bad ground. If the window does not move with either switch it is most probably the window regulator and or motor. You would have to take off the inner door panel to get to it. I have had three of these problems. Switch had impedance/corrosion on the contacts, i kept flipping the switch between open and close and the contacts broke free. On a regulator the wire was all torn up and wound up on itself. A regulator was just not trying to move. Once it was actually one bolt that fell out of the regulator arm that was causing the regulator to be binding. Good luck.

Posted on Oct 19, 2013

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SOURCE: programming replaced master door switch 06 trailblazer

No. not the switch. Check to see if you have power going into it. I don't have the wire diagram, but you can take a test light and check each line. At least one will light up with the key on. Certainly check your fuses.

Hope this helps

Posted on Apr 09, 2010

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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.

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none of the locks work? check fuses first. then check for power at the drivers door lock switch because it is the master switch that feeds all other switches and actuators. if it has power at the switch and through the switch when pressed, start on that drivers door checking for good battery voltage and ground at the lock actuator. if you have power at the drivers switch but no power through it, when depressed, replace the switch.

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Does a 1987 gmcjimmy s-15 have a power window relay ot any relays at all cuz my power windows stoped working it runs a 30 amp circut breaker can the circut breaker go bad?

Anything can go bad, but to my knowledge circuit breakers seldom do. If you have a test light, pull the circuit breaker and probe both terminals for a power signal, with the key on. One terminal should show voltage with key on. If not, check the power distribution box for a blown maxi-fuse, or the wiring from that box to your fuse panel.
BTW, no, no relays are in the window circuit. So if the circuit breaker has power to it, put it back in and check for power on the driver's door master switch-one wire on the master should have voltage with key on. If no hot wire to the master switch, check inside the door openings for a broken wire. If you do have one hot wire there. check the power windows ground-the ground wire for the power windows originates at the master switch and goes back into the cabin to a nearby ground. Put one lead of the test light on the hot wire (key on), and probe the ground terminal at the master switch-if your ground is good, the test light will light up. If the ground is lost, no light. Check for a broken ground wire in the door opening, and/or find the ground and see if it is bad. If the master switch has a hot wire and a good ground wire, replace the master switch.

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All power windows and sunroof will not budge suddenly on neither the drivers master switch or any of the door window switches. Power locks DO work though. I replaced all 10 and 15 amp fuses in fuse box,...

Window fuse's and relay's may be up under driver or passenger side dash or behind glove box, under the hood and even under the seats, and finally on the ends of the dash. All passenger power windows and locks are controlled thru and get power from the master control switch on the drivers door.

Drivers door window gets used the most so it could be the motor, window switch, relay or fuse.
Could also be a broken wire in the rubber boot going from the door to the body. You will have to eliminate each till you find the culprit. Check that all switches return to neutral when released.
The motor and the relay are the most likely to cause this problem. Try swapping the relay with a working window relay. If it still doesn't work, remove the door panel and remove the window motor.
Turn the motor shaft in both directions by hand several turns. Then plug the motor in and see if the switch will now run the motor. Sometimes that's all it takes to get it working again. I have had to do this with brand new motors. If voltage is not present at the motor connector, either a bad switch or a broken wire exists. Make sure to check for voltage coming to that windows switch. Actually, GM use's a circuit breaker type relay for each window and one fuse for all the circuit breakers.

Try this....
Open the door, turn the key to the ON position without starting the engine and everything that makes noise is off. Lean down placing your ears close to the bottom center of the door or at the speaker grill. Press the window switch UP and DOWN. Listen for the window motor. If heard the drive is damaged. If not heard, turn key off and locate and replace the relay with one of the other window relays. Check window again. If it works now, get a new relay. More often than not, removing the motor and turning it by hand will get it working good as new. I have had to do that with Brand New motors! So try it.
If all has failed, with the door panel still off, check for voltage at the motor connector when pushing the window switch. No voltage means its the switch, especially if its a auto down or up switch.

Check the master window control panel on the driver's door. There is probably a lockout switch. It may have a window outline on one end and the same outline with an "X" over it on the other. Press the outline without the "X" and all your windows should work again. As silly as that sounds, a lot people hit that switch without knowing it. Also, if that switch(lockout) is faulty, none of the windows will work. That happens A LOT!!

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First you need to do a physical inspection on the wire. You need to check loose connections or exposed conductors. You then have the option to remedy by refitting loose connections, covering the exposed conductors with electrical tape or replacing the wire.

It would be best to have a multi-tester or multimeter. This should include a continuity tester and a voltmeter. With the use of the continuity tester you can put probes at both ends of the wiring and listen if the meter would beep which mines the lines are not cure or breakage between the ends. A voltmeter is used to measure if you are getting voltage to the end or the wires or the terminals of the switch or the motor. Weak voltage may mean a weak battery or the wires are not connected securely at either end. No voltage at the end of the motor but power to the side of the switch where the wires go to the battery means a problem with the switch. Others use a test light which is like a continuity tester when it lights up.

It does looks like a wiring issue the way you described the problem but it is a good idea to test.

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