OBD2 pinout for MK4 VW Golf GTI 1.8T

[littlemamon]

Hey guys, I need your help with a DBC 1.8T GTI (ME3.8.2) that was converted to DBW (ME7.5).
I'm currently trying to fix an issue with this car and for that I would need the OBD2 pinout from both "versions", could someone please help me out?
Thanks in advance!

 

[Uwe]

You mean the pinout at the OBD-II connector? Or...?

-Uwe-

 

[littlemamon]

You mean the pinout at the OBD-II connector? Or...?

-Uwe-

Thanks for your reply Uwe!
Exactly, I would need to verify that I have the correct pinouts for the ODB2 connector, this is what I got:

Pin1: contact +12v
Pin4: Ground
Pin5: Ground
Pin6: CAN High
Pin7: K-Line
Pin14: CAN Low
Pin16: +12v

I believe that the DBC connector doesn't have the CAN cables but the DBW does.
What I'm not sure about is the Pin15: L-Line, does any of them have it?
Could you please help me with this?
Thanks in advance!

 

[Uwe]

I'm surprised that car has anything at all on Pin 1. Newer cars have +12V (switched "Terminal 15") on Pin 1, but older cars generally don't.

Pin 4 is ground.
Pin 5 may or may not be. Don't count on it.

Pins 6 and 14 will be CAN, but they are not used/needed. They are connected to the instrument cluster, and the instrument cluster is able to connect them to the powertrain CAN in the car, but it doesn't.

Pin 7 is K.

Pin 13 might go to the old ECU. Some M3.8 ECUs were flashable, but only if +12V was applied to a specific pin on the ECU and that went there. This would not be needed with an ME7.

Pin 15 might be L/K2, but won't be needed.

Pin 16 is +12V (unswitched, "Terminal 30"). This is where a scan tool will get power from the car.

All you really need in any Mk.4 car is 4, 7, and 16.

-Uwe-

 

[littlemamon]

Thank you so much Uwe, that was really helpful!
You've cleared a lot of doubts but now I have another that I believe you'll be able to clarify for me.
It has to do with the Eurodyne Flash program, can I post the doubt here or do you prefer that I send it privately?

 

[Uwe]

It has to do with the Eurodyne Flash program, can I post the doubt here or do you prefer that I send it privately?

I don't know anything about "Eurodyne Flash program" and it's been just about 20 years since Eric and I played around with flashing ECUs, so neither of those options is really appropriate.

-Uwe-