'92 e34 M20 - cruise control ecu plug pinout?

I'm trying to retrofit a cruise control into my e34 M20. But, unfortunately, the original connector and harness got damaged and I need to manually connect the wires to a similar connector. I got the another connector with the same number of pins(26),but the colors don't match.

So, is there a way that someone could send me a pinout of the connector that goes into the ECU of the cruise control or a picture could be most useful? I'm talking about the blue connector that goes into the ECU of the cruise control. A picture of the connector where I could see which wire goes in which pin would be most useful. Thanks in advance!

A '92 isn't going to be an M20. Do you mean an M50 2.0? I think I have the actuator, stalk and ECU for a '92 525i auto in a box somewhere

Oh, there's been an engine change :D I assure you that it's M20 inside and I believe that the year of the engine is '89. Could you somehow take a picture of the ecu plug of the cruise control, so that I could see which wire goes in what pin? That would be most useful. Thanks in advance!

The connector is stamped as to the pin count. The numbers can be found at the end pins, looking into the connector, for example 1 and 18, 19 and 35, etc. The wiring chematics can be found in Bentleys repair manual.

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Originally Posted by Rustam

The connector is stamped as to the pin count. The numbers can be found at the end pins, looking into the connector, for example 1 and 18, 19 and 35, etc. The wiring chematics can be found in Bentleys repair manual.

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You have saved me climbing in the attic and searching through boxes. Many thanks :-)

and the connector is also shown in the ETM at the end of the file, see here by built years http://shark.armchair.mb.ca/~dave/BMW/e34/

Thanks, Shogun, for the manual. I found the connector at the end of the file, but, as I stated in my first post, I don't have the original connector, but some connector which has 26 pins. I really need which wire goes to which pin, because the wire colors from this connector doesn't match the original one. If someone could tell me which wire color goes to which pin or if someone could somehow help me how to connect this, I would be most grateful. Thanks in advance, you all! I really appreciate your quick replies and all!

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Originally Posted by marko84

which wire color goes to which pin

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The referenced ETM files tell you exactly that -
number of pin at both computer and connector and color of the wire.

Your actuator is probably part no. 1378315 which has 7 pins . The pin numbers are stamped on it. The ECU I have is for an early '92 auto and is part no. 1388043. That has a blue 26 pin socket. The pin numbers 1 13 14 and 26 are stamped on the corners. The only issue I can see you having is if someone took out the loom for the '92 and put in the '89 one. In that case, some of the colours appear to be different. So compare the wiring diagrams for the 89 and 92 and you should find how to wire it

Seems to be more difficult, different engine installed http://www.bimmerforums.com/forum/sh...ontrol-install

says Marko from Serbia = European model, not US spec.

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Originally Posted by shogun

Seems to be more difficult, different engine installed http://www.bimmerforums.com/forum/sh...ontrol-install

says Marko from Serbia = European model, not US spec.

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That complicates things a bit! But it may come down to just wiring:

1992 M30 uses ECU 1387625 and Actuator 1378315. From the pics in the other thread, this is what OP has got
1989 M20 uses ECU 1388043 and Actuator 1388315.

Realoem shows the changeover point from 1388043 to 1387625 as September '91 and says it is not backwards compatible. Mine was built in Feb '92 and realoem shows it had the later one. It didn't. It had the earlier 1388043 and worked perfectly. That is probably what they had on the shelf at the time where it was built, together with the 'old' loom. Sot it would appear you can use either provided you wire it up correctly

Attachment 8170Attachment 8171Attachment 8172Attachment 8173

As you can see I managed to remove the wires from the connector I've obtained. The reason why I did that was because the wire colors didn't match. So I re-pinned the connector according to the ETM and got myself a new connector. Now, I'm on my way to connect the wires from this connector to the actuator, as you can see on the last picture. I will post more picture as I move on. Cheers and thank you all for your help!

Started retrofitting the cruise control in my E34 M20 and successfully routed the wires from the actuator to the ECU, but a new problem came up.


My cruise control stalk has only two wires (yellow/white and brown/blue) and that stalk is from the previous engine (535 M30), which I mentioned when I stated that I had an engine conversion two years ago. The thing that is bothering me is that the connector in my car, in which I should plug in the stalk, has 5 pins and the stalk connector has only 2 pins (or wires).


My question is: Can I use this stalk and somehow modify the stalk connector, which is missing 3 wires or pins, or should I obtain another stalk? Thanks in advance!

Can someone help me? Almost finished everything, I'm stuck with the stalk. Just tell me should I buy a proper stalk or is there a way to modify the connector of this stalk? As I can see, this stalk has the same functions as the other stalks, but it differs because it has only two wires or pins, unlike the other stalks which have 5 pins or wires. Thanks again!

I have thrown cars away with electrical issues so needless to say I can't help much. I would guess it would be easier to get a stalk with the 5 wires and go from there. Still doesn't mean your cruise will work if you changed out the wiring harness that goes to the cruise control.

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Originally Posted by marko84

Can someone help me? Almost finished everything, I'm stuck with the stalk. Just tell me should I buy a proper stalk or is there a way to modify the connector of this stalk? As I can see, this stalk has the same functions as the other stalks, but it differs because it has only two wires or pins, unlike the other stalks which have 5 pins or wires. Thanks again!

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I think you already know the answer. Without looking at a wiring diagram, I'd suggest that the stalk has 5 wires because it needs them. I think there are different designs of stalk though - mine had a serious double bend in it. If it didn't, you would not see it behind the steering wheel

(1) look at the wiring diagram. How many wires are going into the connector?

(2) part numbers for electrical connector fittings should be available at realoem.com