[Whateva]

Can anyone share the wiring schematic for an F series N55 OBD port?
I am trying to wire up ShiftP2 shift light
Shift-P2 - Ecliptech

[Whateva]

Looking for the RPM pin, but now its looking like I should get it from the cluster: Instrument cluster

The diagram on this link looks like the RPM is in the (KOMBI) so maybe it is not as easy as tapping a wire into an "RPM signal". Does anyone or has anyone ever tapped into the coil wires?

[Payam @ BMS]

We get RPM from the third unused pin on the black OBD2 cable.

[Whateva]

Originally Posted by Payam @ BMS

We get RPM from the third unused pin on the black OBD2 cable.

BMW OBD-II diagnostic interface pinout diagram @ pinoutguide.com

This diagram shows 2 & 3 pins not being used. Is this correct? and if so, I could tap that 3rd pin to readout an RPM signal?

That link above is from a diagram showing a 2001 535 so I just wanted to be clear.


However, this is a diagram from an e90 that shows pin 3 as a vendor option.



Thanks

[Payam @ BMS]

Originally Posted by Whateva

BMW OBD-II diagnostic interface pinout diagram @ pinoutguide.com

This diagram shows 2 & 3 pins not being used. Is this correct? and if so, I could tap that 3rd pin to readout an RPM signal?

That link above is from a diagram showing a 2001 535 so I just wanted to be clear.


However, this is a diagram from an e90 that shows pin 3 as a vendor option.



Thanks

Pin 3 on the OBD2 molex end.

You'll see a pin that's unused:
https://lh3.googleusercontent.com/pr...IU7NHQnKIBFkmt

[Whateva]

You have to excuse my understanding of the vernacular Molex. If the Molex is the pin socket interconnection and its relation to the ODB cable; couldn't I just dissect my USB to OBD and find the unused pin?

If that is the case, then how would I know where the unused pin on the USB side was supposed pin to on the OBD side?

Thanks for all the help


are you referring to this cable? https://burgertuning.com/products/jb4-obdii-replacement

if this is the unused connection then I suppose I could tap directly into that line from the vehicle.

[Payam @ BMS]

Originally Posted by Whateva

You have to excuse my understanding of the vernacular Molex. If the Molex is the pin socket interconnection and its relation to the ODB cable; couldn't I just dissect my USB to OBD and find the unused pin?

If that is the case, then how would I know where the unused pin on the USB side was supposed pin to on the OBD side?

Thanks for all the help


are you referring to this cable? https://burgertuning.com/products/jb4-obdii-replacement

if this is the unused connection then I suppose I could tap directly into that line from the vehicle.

Yes that cable.

The lower pin that is unused that I marked with the red arrow is RPM.
The green and brown wires go to were I marked.

[Whateva]

Excellent, Thank you, Payam!