B37 / ECU pin 79

[Atuca]

I am in the middle of my Interior Rewire and have a specific question that I think warrents its own thread.

The plug behind the OBDII, the white/clear plug on my 99 eclipse GSX, has one red wire attached to it, described perfectly here:

Originally Posted by luv2rallye

On my '99 GST and in the '99 Mitsu Eclipse manual, that is plug B37 which is white and located right behind the OBDII plug (B38) mounted on the same metal holder. Although it is supposed to be a 12 pin connector (pins 21-32), it actually only has 1 pin installed in it (but has slots for 12). This is pin 26 (in the corner) which is connected to a red wire which goes to ECU pin 79. This is for turbo models. The NT shows 3 wires going to it.

**the picture here shows the connector on a non turbo eclipse, which has 3 wires/pins**


From DSMlink forums:

http://www.dsmlink.com/images/forums/2GECUPinout.pdf

Pin 79 is "12 Pin Connector (Drag)"




There is no more information though on the connector B37, nor is there info on ECU pin 79. Since it is my belief I never use it and the ECU couldn't use it as it is an open wire, I would delete the plug and ECU wire as part of my rewire, but I would like to hear more information on what this wire is, what it does, and why is it in my car?

Thanks in advance folks!

[delta448]

Going solely from what I remember, I believe pin 79 is the reflash signal to the flashable H8 DSM ECUs like your 99 would have had from the factory. I know for certain pin 79 is the flash pin on the Evo 8/9 ECUs, but I've not yet had a flashable DSM ECU to play with.

[Atuca]

That is what I was told as well by another friend, he said in DSM use today, it is used only for EVOscan, but as I have DSMlink, I think it is safe to remove this plug and from the ecu.

Any more input great or "I agree" posts welcome, otherwise, I think mission acomplished.

[Ceddy]

Thats the Flash Connector, you only need it if you are going to Flash your ECU.

[Atuca]

Verified by Administrators on the DSMlink forums, pin 79 is used for reflashing the 99 ECU, and is in no way used by a 95 EPROM dsmlink ecu, even if you wanted to try and reflash it.

The plug and its assosiate wiring was eliminated.

Thank you Ceddy and others for the input.