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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 03-02-2013, 02:02 PM
austenjm90 austenjm90 is offline
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Mein Auto: 1991 318is w/ M50 Engine
wiring ignition switches

I'm wiring the ignition on my 318is to some switches and need a little help on identifying the wires.
I know the red is hot all the time, Black is the starter? Violet is acc?
Heres a picture of all the wires; 1 red, 1 black, 2 green, 1 violet, 4 brown with different color lines.
Thanks!
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  #2  
Old 03-02-2013, 04:29 PM
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toybuilder toybuilder is offline
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more info

What year is your 318 .I can put post a wiring diagram for you but BMW loves to change stuff.
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  #3  
Old 03-02-2013, 05:13 PM
austenjm90 austenjm90 is offline
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Thanks, It's a 1991 318is.
Yeah, I was able to find a wiring diagram but it wasn't exactly the same
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  #4  
Old 03-02-2013, 08:53 PM
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Build Date

Inside the drivers door there's a vin tag inside the drivers door on the B piler it should have a date on it when the car was built early cars and later cars are not always the same but if you don't have the factory manuals it won't show you the differences /they usually do updates.in the books.
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  #5  
Old 03-03-2013, 12:12 AM
Billwill Billwill is online now
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Hard to tell the colors from your picture but most of them have a stripe through them ie. the two green wire have stripes through them.

Could you give us some more detail please of exactly what the colors are.

Is that picture showing us the leads coming off the ignition switch....what ignition switch is it? ie. is it for a 318is or for a M50?

Or is the picture showing us the end of the M50 harness?
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  #6  
Old 03-03-2013, 10:26 AM
austenjm90 austenjm90 is offline
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The picture shows the leads off of the ignition switch for an e30 318is. The wires i havent identified are solid green, green w/ white stripe, violet, brown w/ red stripe, brown w/ blue, brown w/ green, and a solid brown.
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  #7  
Old 03-04-2013, 02:10 AM
Billwill Billwill is online now
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Quote:
Originally Posted by austenjm90 View Post
The picture shows the leads off of the ignition switch for an e30 318is. The wires i havent identified are solid green, green w/ white stripe, violet, brown w/ red stripe, brown w/ blue, brown w/ green, and a solid brown.

OK none of my diagrams have those colors.

Red is probably +12 volts and you can use a meter to see what happens as you move the switch from position to position.

First position is nothing switched on.

The first click would be to supply power to the accesories such as the radio, next click is for ignition ON and final spring-loaded click will be for the starter motor.
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  #8  
Old 03-04-2013, 03:05 AM
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? engine harness

If your running an M50 now did you use the E36 engine harness. What are you using for an ECU(stock E36,stand alone unit ,ect.).You might be better off wiring in an E36 ignition if your using the rest of the harness anyway.
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  #9  
Old 03-04-2013, 03:27 PM
austenjm90 austenjm90 is offline
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I haven't had the car all that long so i'm not sure as to the specifics on the ecu and wiring harness. Although I think i've got it figured out.
Brown/green and brown/red go to the seatbelt indicator. Only one I havent gotten yet is brown and brown/blue, this diagram has both but I'm not sure what they go to.
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  #10  
Old 03-04-2013, 05:42 PM
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Plain brown on any BMW wiring is always ground (earth).
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  #11  
Old 03-04-2013, 11:03 PM
Billwill Billwill is online now
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Quote:
Originally Posted by hornhospital View Post
Plain brown on any BMW wiring is always ground (earth).

The circuit diagram posted shows the Brown wire internally connected in the switch to the Black/Yellow wire which is always the positive start lead going to the solenoid so I would be wary of connecting that brown wire to ground.

@OP, It is not rocket science to measure the ignition switch with an Ohm-meter to see what connects to what when the key is moved from position to position. maybe some leads will be unused
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  #12  
Old 03-05-2013, 12:20 AM
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Quote:
Originally Posted by Billwill View Post

Red is probably +12 volts and you can use a meter to see what happens as you move the switch from position to position.
Quote:
Originally Posted by Billwill View Post

@OP, It is not rocket science to measure the ignition switch with an Ohm-meter to see what connects to what when the key is moved from position to position. maybe some leads will be unused
THIS

looking at the colours is MADNESS in a BMW. they change month to month year to year.

you need to USE the ETMs (electronic troubleshooting manuals) for your car and go from there. it will show the switch and what wire goes to what etc etc. easy.
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  #13  
Old 03-05-2013, 03:27 AM
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mating e30 to e36

The problem is what harness are you hooking this switch to an modified e30 or an e36 because there not the same.Even the keys are different some of the early single vanos ECUs have to be programed to the car so you need the right harness to do it. So you really need to know what your working with or it's not likely to work very well .Who put the M50 in your car? Can you ask them if they know what's up?IE a list of what parts were used for the conversion.You can just hot wire a switch to start your car and a switch to turn on your engine harness .
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  #14  
Old 03-07-2013, 04:09 AM
austenjm90 austenjm90 is offline
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Thanks for the help, i got it running. Whenever i get the chance ill post a wiring diagram of what i did for anyone to reference.
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  #15  
Old 03-12-2013, 06:53 PM
austenjm90 austenjm90 is offline
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wiring sketch

Heres a rough sketch of how I hooked it up. Connected the red 12v wire to one side of the acc and on switch. Other side of the acc switch is Violet, on switch is connected to both greens and the brown/blue wire. I ended up not using the brown/green and brown/red. Black/yellow (starter) is powered by a relay connected to a momentary start switch, didnt need the two relays at the bottom.
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  #16  
Old 05-07-2013, 08:14 PM
Scott183 Scott183 is offline
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Quote:
Originally Posted by austenjm90 View Post
Heres a rough sketch of how I hooked it up. Connected the red 12v wire to one side of the acc and on switch. Other side of the acc switch is Violet, on switch is connected to both greens and the brown/blue wire. I ended up not using the brown/green and brown/red. Black/yellow (starter) is powered by a relay connected to a momentary start switch, didnt need the two relays at the bottom.
Hey Austen, I found this post via google search and hope you can help. I've looked at every wiring diagram including the factory manual and can not find what this green/white stripe wire powers up. It is not shown coming off the switch at all. Any guidance you or any board members could give is greatly appreciated. We are building a race car out of this with a custom switch panel and I'm not sure if this wire needs to be hooked up. Thanks in advance
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  #17  
Old 05-08-2013, 06:48 PM
austenjm90 austenjm90 is offline
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I cant remember off the top of my head what the green/white wire goes to, but I can tell you how I hooked mine up. It's worked great so far!

I used two switches and a momentary push button. One switch acts as the first key position (acc), the other switch is the second key position (on), and the push button is the starter (ign).
- The acc switch I connected one end to the red wire (+12v) and the other end to the violet wire.
- For the on switch attach the red wire (+12v) to one end and the green/white, solid green, and brown/blue wires to the other end.
- Probably not necessary, but I used a relay to power the starter. I did this so that the starter can't be engaged without the second switch turned on. This also let me use a fuse and low amp switches. One side of the relay attach the red wire with the momentary switch and a ground wire. On the other end of the relay I attached the red wire and the black/yellow starter wire.

Probably more than you wanted to know haha. Hopefully this helps and isn't too confusing.
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  #18  
Old 10-21-2013, 04:20 AM
joe0195 joe0195 is offline
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HI

Thats a nice explanation..
I assume its similar for 97 328?
Also anty chance you can explain or draw up how to hook up the relay?

The two toggles dont need relay correct?
Also what size relay and switches?

Thnks in Advance
Joe
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  #19  
Old 10-21-2013, 04:02 PM
austenjm90 austenjm90 is offline
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If you look at the drawing i posted a few posts up, the relay is the box on the left. You only need the relay on the starter button. The purpose of having the relay is so that you can use a low voltage button for the starter. The starter power goes through the relay as opposed to straight through the switch.
Most simple relays are the same, there will be four leads used.
Starter, +12v for the starter, signal from the push button, and ground.
Hope this helps
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  #20  
Old 10-21-2013, 04:33 PM
joe0195 joe0195 is offline
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thanks so much for getting back . That helps alot!!

Can I ask one more thing?
So I assume a 50A relay will work?

one side to ground
one side to power
one side to starter button
one side to black/yellow(Mine may be different what doe that do?)

Thanks again
Joe
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  #21  
Old 10-21-2013, 06:26 PM
austenjm90 austenjm90 is offline
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Yes, that should work. The starter wire might not be black/yellow on your car though
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  #22  
Old 10-22-2013, 06:09 AM
joe0195 joe0195 is offline
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Ok Last question...

So on the relay its 30 to power
85 to ground
86 to starter wire
87 to switch ?

Thanks
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  #23  
Old 10-22-2013, 01:56 PM
joe0195 joe0195 is offline
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Sorry one more..
Is the other side of the start button to ground?
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  #24  
Old 10-24-2013, 12:20 PM
austenjm90 austenjm90 is offline
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I attached a photo that should help, if you google some basic automotive relay diagrams they should all be similar
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  #25  
Old 03-24-2014, 01:03 PM
GUmotorsports GUmotorsports is offline
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Quote:
Originally Posted by austenjm90 View Post
Heres a rough sketch of how I hooked it up. Connected the red 12v wire to one side of the acc and on switch. Other side of the acc switch is Violet, on switch is connected to both greens and the brown/blue wire. I ended up not using the brown/green and brown/red. Black/yellow (starter) is powered by a relay connected to a momentary start switch, didnt need the two relays at the bottom.

AUSTENJM90

just want to double check in this diagram you show you ground the 2 switches for acc and ignition?
so are the switches 3 prong or how did you tie a ground into them? just confused because the starter button in your picture goes to the purple and grn wires but you have a ground in the middle..
can you tell me what you did.. I'm doing this to my race car and want to make sure i do it right.. thanks
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