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Old 10-24-2020, 12:11 AM
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aureliusmax aureliusmax is offline
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Join Date: Sep 2019
Location: abbotsford canada
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Quote:
Originally Posted by Frankiesayrelax View Post
Yahhhh, definitely insulted that you would suggest I would skip right past something so obvious and comparatively simple as reading the instructions and a wiring diagram, and come straight to xoutpost.
Actually, there was no instructions included specifically on wiring for the tach signal (personally, I haven’t mastered the art of reading instructions which do not themselves exist!) at any rate, I first acquired a pin out for each dash cluster connector (from a BMW specialist mechanic) and found that the “TD” wire of the CAN bus was not suitable for the device im using, which requires a sinusoidal wave signal (the CAN Bus signal then must not be sinusoidal or otherwise is not suitable for my application). So, after the wiring diagram failed to produce a suitable tap-in point, and the manufacturer couldn’t tell me which signal it was for my specific vehicle (no surprise there), I went back to the internet with a suspicion that the OBD II port (as was suggested above) would be my route (if TorquePro or OBD Fusion could get RPM data from my engine so should I). A couple days later I managed to find a BMW related OBD port pin out that showed pin #9 on the connector was a tachometer signal. (Furthermore, I’d read on another forum a thread where someone had used an oscilloscope to confirm this signal was sinusoidal) I tapped into that wire and low and behold my shift light works flawlessly. And this after even BMW mechanics told me I wouldn’t be able to do it on a “CAN bussed”, which just goes to show you, where there’s a will there’s a way.

Here’s the Pin out that I used (apparently, applicable to all BMW models after 2000:

1 - +12V (ignition, in run or start)
4 - Chassis Ground
5 - Signal Ground
6 - CAN high J-2284
7 - ISO 9141-2 K-Line (engine, ISO-9141 and ISO 14230, automatic transmission diagnostic)
8 - ISO 9141-2 K-Line (IKE/KOMBI, ABS, ABS/ASR, ABS/ABD, ESP, DSC, Airbag and other electronic equipment)
9 - TR/RPM
14 - CAN Lo J-2284
15 - ISO 9141-2 L-Line (of ISO 9141- and ISO 14230-4)
16 - +12V (battery power)
thanks for your followup. this information and data can really help the community.
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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project.
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