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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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.
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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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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.
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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.
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