1984 Window switch help

[ballysdad]

I know they are wired in series so if one is bad the other will not work. I took all 3 out and tested them on the drivers window by themselves and all 3 worked fine.
Next I installed the passenger switches in each door.
The drivers window switch put the window up and down on the drivers side no problem.
The passenger switch does not work up or down by itself
If I press both passenger switch on the drivers door and the passenger switch on the passenger door I can move the passenger window up and down no problem.

The passenger window will not work on the driverside by itself either only if both are dressed at the same time ie: passenger switch and driverside passenger switch.
Any ideas?

[jpk]

The switches must work differently depending on which position they are in, so there's no guarantee that because it works in one position it will work in another. This drove me crazy for quite a while with my '84.
It's simple enough to open them up and clean the contacts inside; a little fine emory cloth and denaured alcohol will do it. Clean all three, bend the spring contacts a little bit so they're "springier" put them back in, and I'd bet everything works like new.

[John_AZ]

ballysdad,

I am not good at reading the switch circuit for the windows but I copied the curcuit photo:





Now what I have found out. I have replaced the switches with the new style ??? --current---switch because even when I cleaned the switch as mentioned it did not improve. YMMV. The recent switches I bought have been fine. I do not know what improvement was made. Only my experience.

GL
John_AZ
1988 924S + 1987 924S

[ballysdad]

Thank you.. I just finished cleaning all 3 of them..istalled them and blew my fuse .. quick question I am looking at the schematic and it seems that power is supplied to the passengerside switch via the drivers side passenger switch on red/white..red/black should there be constant power on the passengerside switch with the key on or does the driverside passengerswitch need to be in to complete the circuit?

[jpk]

Both switches must be in place to complete the circuit. Power is switched with the ignition via the relay (shown in the diagram)

If you blew the fuse, there's a short in one of the switches; it's no biggie, that's what the fuse is for. You can figgure out which switch is bad by plugging them in one-by-one in the driver's door plug for the driver's window and turning the ignition on. It might cost you a few 16amp fuses though.

If you have a multimeter you can check the switches on the bench; check continuity from PinC to PinD and PinC to PinE. Both paths should be infinite resistance or open circuit.

When both switches are in thier "neutral" positions, +12 is supplied to both sides of the motor. When you press one side of one switch, you change that particular path from +12 to ground.

In the switch block in the diagram, there are two paths for power to flow through the switch; PinD to PinA and PinE to PinB.
When you press one side , (say the left side of the top switch) the path from PinD to PinA changes to cut off PinD and instead route power from PinA to PinC which ultimately flows to ground.
In this state, power flows down the path from PinE -> PinB in the top switch, down through PinE->PinB in the bottom switch, then through the motor, then up trhrough PinA -> PinD in the bottom switch, then up through PinA -> PinC in the top switch, then to ground.

This allows either side of either switch to operate the motor in the desired direction; there are four paths through the two switches, and if you interrupt any one of those and provide a path to ground, the motor will run.

[ballysdad]

Thank you very thorough I like it!!... clean all switches found which one was causing short..all work fine up and down in the driverside but will only operate passenger if I hold both passenger switches at the same time still...driving me crazy..

[TibetanT]

You may have a bad relay which is causing this problem.

[jpk]

There's only one relay in the circuit; if it was bad, the windows would not work at all.

If you have to press both switches, then something is not right. The way this circuit is designed, the motor should not run at all if more than one switch is pressed.

The problem is that one of the two paths in one of the switches does not let power flow when the switch is in neutral. When you operate one switch, then the other switch is passive; it must simply pass power through both paths inside. Also, each side of the switch is independent; when you press UP on a switch, the other path of that switch must pass power through.

For the pass. side, do you need to press the two switches to operate both up and down? What happens if you swap those two switches (driver door <--> pass door) does it still work the same way?

[ballysdad]

yes no matter what combonation I still have to depress both passenger switches to get the passenger window to go down or up
Note: when the key is on I get power on 2 pins of each switch on the drivers door.. I do not get power on any pins on the pasenger switch on the passengerside until I depress driverside passenger switch then I get power on 2 pins of the passenger side switch but still have to depress both switches to move window..