Problem with Power Window Circuit Breaker Switch

[limas]

Hi,

i have an issue with the Power Window Circuit Breaker Switch.

Initially, i have to inform you all that my 2-door E30 is a 1984 model M10, swapped to M42. I bought it as M42. So, i am trying to solve some problems on my own. To the point, i pushed out the window breaker switch, as i did not know what is this part. I "google" the part number and i found the answer. Behind the switch, there are 2 green-blue wires, as refered to this post:http://www.r3vlimited.com/board/show...61&postcount=1 . One wire is for both window control switches and the other is for sun roof usage (not in use at the moment).

So, i pulled off the window switches and i saw a green-gray wire behind each switch.

p.s.: I used a multimeter to check the circuit and the functionality of the window breaker. When the button is pressed, there is circuit and the multimeter sound a "beep". On the other hand, when the button is not pressed, there is no circuit and the multimeter does not sound a "beep". So, i conclude that the window breaker switch is functional.

Please, correct me if i am wrong.

Regards,
Mike

[limas]

Hi, according to the last post, i capture some photos to show you exactly the wiring connection.

On the first attached photo, you can see 2 blue-green wires. These 2 wires are connected on the window breaker switch.

The second photo shows the wiring behind the driver's window control switch. I checked the circuit between the left wire of the first photo and the #3 pin (to the point the screwdriver points) on the driver's side. I hear the "beeeep", so there is no wring cut.

The third photo shows the wiring behind the passenger's window control switch. I checked the circuit between the left wire of the first photo and the #3 pin (to the point the screwdriver points) on the passenger's side. I hear the "beeeep", so there is no wring cut.

In addition, there is a circuit between the #3 pin at the driver's side and the #3 pin at the passenger's side.

The spare blue-green wire (the right one) is used for sunroof (not used). My windows are free to be used, even though the window breaker switch is pressed or not.

Any help? Any advice? The circuit seems to bypass the window breaker switch. I do not know why...

Thank you in advance.

[limas]

I tried to replace the K5 relay with K7 but the problem still remains.

I get 11.7V both on the green-gray wire behind windows breaker switch and on green-gray wires on the harness back from the window control switches.

I think i should not get any DC voltage while the window breaker switched is removed.

[AndrewBird]

What problem are you having? You never said. Do none of the power windows work? Did you check the fuses for them? Have they worked before and just suddenly stopped?

[limas]

What problem are you having? You never said. Do none of the power windows work? Did you check the fuses for them? Have they worked before and just suddenly stopped?

I bought a BMW E30 m10 swapped to M42. I saw a switch and i did not know what it was. So, i search in google according to the part number, and i found out it was a window breaker/canceler switch.

The problem is that window breaker/canceler switch does not cut off the circuit if it is pressed or unpressed. The circuit acts like there is no switch on the circuit.

Then, i saw the wiring diagram.

I checked the fuse #17. It's ok. I put relay K5 to the position of K7 relay and relay K7 to the K5 position.The problem still remains.

I think window control switches shouldn't move up or down the windows if the window breaker/canceler switch is unpressed.

[Madhatter]

No, they should work when the switch is not pressed, it's when the breaker is pressed that they stop.

Look at your switch. Push it down so it pops out. Look at the sides, can you see a red line around the switch?

It not, you haven't pushed the switch in hard enough.

[limas]

No, they should work when the switch is not pressed, it's when the breaker is pressed that they stop.

Look at your switch. Push it down so it pops out. Look at the sides, can you see a red line around the switch?

It not, you haven't pushed the switch in hard enough.

I will check it and i will post again in a few minutes.

Thank you.

[Madhatter]

It's a circuit breaker, so when its closed the switch is actually pushed in and stays it. When its open it has popped out and you'll see a red line around the switch. That's how it is supposed to work.

Red line visible = power cut.

Easy way to tell if something is funky, simply unplug the circuit breaker. This is basically the same as the switch popping out, should cut power to everything. So pop it out of the console and remove the plugs off the back. Should stop everything working.

[limas]

It's a circuit breaker, so when its closed the switch is actually pushed in and stays it. When its open it has popped out and you'll see a red line around the switch. That's how it is supposed to work.

Red line visible = power cut.

Easy way to tell if something is funky, simply unplug the circuit breaker. This is basically the same as the switch popping out, should cut power to everything. So pop it out of the console and remove the plugs off the back. Should stop everything working.

I really thank you. I poulled out the switch.

So,

Red line visible = power not cut.
Red line invisible = power not cut.

The windows are lifting up or down, even though the circuit breaker switch is pushed in or out.

Do you think the circuit breaker switch have problem?

On the back of the switch only one gray-green wire is plugged on the switch.

I removed the switch. The windows are lifting up and down, again.

[Madhatter]

Then you have something bypassed somewhere. Having one of those wires disconnected from the switch should break the circuit and you shouldn't have power.

Best guess is someone has wired in something aftermarket, like for an alarm or something. You'll have to find it if you want it to work 100% properly like factory. Or if you don't have any problems with the windows actually working, just leave it as it is.

[limas]

Then you have something bypassed somewhere. Having one of those wires disconnected from the switch should break the circuit and you shouldn't have power.

Best guess is someone has wired in something aftermarket, like for an alarm or something. You'll have to find it if you want it to work 100% properly like factory. Or if you don't have any problems with the windows actually working, just leave it as it is.

Yes, i am thinking the same. I will try to find out the wiring on the back of radio cd and all the wiring harness. If i will not find any solution, i will let it as it is, as i do not have any other problem.

In addition i will open the swithces, i will clean them, and put some contact spary.

[limas]

Then you have something bypassed somewhere. Having one of those wires disconnected from the switch should break the circuit and you shouldn't have power.

Best guess is someone has wired in something aftermarket, like for an alarm or something. You'll have to find it if you want it to work 100% properly like factory. Or if you don't have any problems with the windows actually working, just leave it as it is.

What about the switch? According to me there is no problem on the switch but i want your opinion.

[Madhatter]

You bypassed the switch when you found one of the wires disconnected and the windows still worked. That should have created an open circuit which cut power to the windows, so id say your switch is fine. Easy enough to check, with it pushed in, check it with a multimeter, it should be a closed circuit. With it popped out it should be open.

Probably find your switches will look like this.





Easy enough to clean them up with fine sandpaper or steel wool/scotchbrite pads and contact cleaner.

[limas]

You bypassed the switch when you found one of the wires disconnected and the windows still worked. That should have created an open circuit which cut power to the windows, so id say your switch is fine. Easy enough to check, with it pushed in, check it with a multimeter, it should be a closed circuit. With it popped out it should be open.

Probably find your switches will look like this.





Easy enough to clean them up with fine sandpaper or steel wool/scotchbrite pads and contact cleaner.

Morning!

(You wrote)Easy enough to check, with it pushed in, check it with a multimeter, it should be a closed circuit. With it popped out it should be open.

I checked the switch. It acts just like you describe. I think there is no problem on switch. But, i will open and clean it.

I think the problem is on the wiring.

[Madhatter]

clean your window switches while you are there. They operate a lot better when cleaned of 20 years of gunk.