Thread: Fusion Brain and Window Contorls

First of all, this is doesn't belong in "Documentation and Tutorials"

You need either 4 SPST relays for each direction and each window, or 1 DPDT relay for each direction/window.

We only sell SPST relays on our site. You probably should pick up a DPDT relay on your own, and use the 2-pin cables we sell to hook it up.

I don't know if all cars are like mine but I'm sure most are. The switches all short to ground in center pos. Each wire going to the motor needs to be cut after the switch. Switch to N.C. side of relay, and motor to the sweep thing on the relay. That way it's like it's not there when not in use. Then the N.O. side goes to battery. Energize the relay and it gives power to the motor and the other side is already grounded through the other relay through the switch. If you have express down, you need to patch in after it. You must make the cut on the wire going to the motor.

Here's a schematic:
[media]http://curioustech.home.insightbb.com/images/pwrwindow.jpg[/media]

Ok from looking around at a few websites and a datasheet i finally understand how this would work with the DPDT relay. I apparently was thinking of it as a SPST and in that case i would need 4 for up and 4 for down. Thanks everyone

Automotive SPDT will work fine. 2 for each window. 1 for up. 1 for down.

Most window motors are reversed by changing the polarity (+ and -) on two leads.

Something to think about when wiring window control relays in addition to standard OEM switches:

What happens when your computer is driving a relay on to raise the window and someone is pushing the manual switch down? If you haven't thought this through, you could be asking for problems. However you wire it, only one control source should be able to activate at a time so that your controls are not trying to fight each other.

As for Express UP or DOWN features, you can just use a timer to stop running the motor after a pre-determined time instead of sensing the motor stall current.

Originally Posted by JimmyFitz

What happens when your computer is driving a relay on to raise the window and someone is pushing the manual switch down?

That would connect both sides of the motor to (+) and does nothing until you let go.

The modules sold with alarms have been tested and work well. The one I have cuts off when you do that because the current drops to 0. It sequences each window one at a time and even cracks the windows when it's hot. It actually uses a PIC16F863.

Oh, also current sensing allows you to stick your head in the window to stop it.

Originally Posted by Curiosity

Oh, also current sensing allows you to stick your head in the window to stop it.

yeah, but we dont reccommend that!

We have this on my mom's lexus and it works ok with some force, but not well enough for me to trust it to stop with my hand in there for real! When the dealership was demo-ing it though it worked well of course, I am just too scared to try because those have some force to them!

Originally Posted by Curiosity

That would connect both sides of the motor to (+) and does nothing until you let go.

The modules sold with alarms have been tested and work well. The one I have cuts off when you do that because the current drops to 0. It sequences each window one at a time and even cracks the windows when it's hot. It actually uses a PIC16F863.

I'm a little confused by this. Based on how i'm thinking it would be hooked up if you have a stationary position of both terminals to the motor being grounded and the relays switch that based on the output of the fusion brain then if you are pressing the switch to go down and ur computer is telling it to go up i would that you would be connecting power to ground. Am i wrong here? Am i thinking thinking of the connection incorrectly?

Power will never short to ground. Look at my first schematic. It works just like the passenger switches. It's either passive or powering. Here's a simpler example.