good evening youtube so this is the original oem power window switch off of the passenger side this
is the one i replaced a couple of weeks ago when i took this out i was curious as to how this thing
works how it's actually built inside i've never really looked into these too much
this is basically a double pole double throw switch here's one pole and the other pole
there's a normally closed contact on the top and then when you push that wiper down
there's a contact down here on the bottom that contacts to this brass here and then likewise
down here is another contact yeah so the two normally open contacts which are on the bottom are
connected together so there's one common terminal for the normally open contacts the normally closed
contacts which is this one and this one are separate the connector has five pins so what it
has is the two common terminals the two normally closed terminals and then it has the common
normally open terminal so those are the five connections and i'll show you that in a minute
here this is the up switch so when you push that button down the window goes up and when you push
this switch closed the window goes down the key to this whole thing is this rocker
and it's symmetrical you can put it in any way you want and the way it's built it's got these two
spring-loaded plungers there so that's the spring there's no spring in here and then on each side
there's this little tab that sticks down one there and one there those line up here with these
shiny marks here you can see if you push the rocker to the up position you're only
operating half the switch you operate this half and when you go down you're operating this half
so this rocker is really kind of neat it makes sure that you can't operate both sides at the
same time so instead of this being a real double pole double throw switch where you're
flipping two sets of contacts at once you're only changing one set of contacts at any one time
this would be more your typical setup you would have a a double pole double throw switch and you
would have a normally open position and then a center off so you if you're in the middle
like your rocker here is just sitting there that would be awe and then you flip it down
you would flip both these contacts down and then you would put 12 volts to the bottom of the motor
and you would put ground to the top of the motor and it would go down and then likewise if you go
up to the up position here and now you have 12 volts and ground and the motor turns the other
way so that's more of the classic wiring for a double pole double throw switch but they were
able to do that same feature with two single pole double throw switches so it just makes the switch
a lot simpler it's still got both sets of contacts but you're only operating one contact at a time
and let me show you how that works here so yeah this is out of my 85 4runner so they they have
what they call the power main relay or the power window relay and this relay gets power from the
accessory position on your ignition switch and just turns on and that sends power down here to
your power windows and that's the relay i bypassed i just pulled the relay out and ran a jumper over
here this is your 12 volts coming off the battery through the relay and then it comes
down the print got chopped off but it comes down here you see the lr wire and then you've also got
lr up here that's your 12 volts so that's your common normally open contacts on the driver's
side and then on the passenger side all the normally open contacts are connected to 12 volts
all the time yeah so you have your ground connection here chassis ground comes up here
and connects to the driver side master switch to the two normally closed contacts so those are tied
together to ground and there's no ground to the passenger side switch so the way the switch works
if assuming you just leave the master switch on the driver side alone you've got ground here and
gear and you've got 12 volts here 12 volts here so if you push the up switch which is like this one
that moves that contact from here to the bottom position now you've got
12 volts here through the motor and then back through here and back to ground
the current has to flow from here through the motor back to the driver's side and then back to
chassis ground so that's why the passenger side windows are always a little bit weaker because
you've got this ground connection that has to go from the driver's side over to the passenger side
there is a direct 12 volt connection here but then if you operate the window from the driver's side
let's say you want to go up and if you push that switch closed you now have 12 volts here
and it's just like you operated this switch but you operated it over here
i think one of the reasons they do that is like let's say the driver we're trying to roll the
motor up so he's got the this switch closed you've got 12 volts here and let's say the passenger
wanted to roll the window down so he switches over here so he's got 12 volt coming through
here to the motor you've got 12 volts on each side of the motor nothing happens there's no
short circuit it just sits there doesn't do anything and whoever lets go of the switch
first the other switch takes over so yeah it's kind of a neat setup but anyway let's go
in and take a look on the computer screen because i've got the 88 4runner and a 1990
second gen 4 runner and we can see how the power window switches have changed they're very similar
over the years but they've done little tweaks to them so let's go take a look at that next