VCDS problem

[Lopez90]

Tried for the first time to connect vagcom today on my 91 3b coupe, without success.
0 voltage on the black terminal with ignition on. The computer finds VCDS but not the car.
Where do i find the other ends of the terminals, so i can check if they are plugged in?

[Greg_S]

They may have spliced into the loom to fit an obd ii connector, can you see the wiring in the fuse box to the 2x2 connectors?

[Lopez90]

They are currently under the dash. Used a cable finder and both Black and brown connectors goes to the ecu. After reading schematics i should have constanly 12v on the Black connector?

[Lopez90]

Connected the VCDS power straight from the battery and it looks like i have connection with the ecu, so the brown connector works. Question now is how do i fix the black connector (power to VCDS)?

[newsh]

Connected the VCDS power straight from the battery and it looks like i have connection with the ecu, so the brown connector works. Question now is how do i fix the black connector (power to VCDS)?

There’s a fuse, can’t remember which though.

[newsh]

There’s a fuse, can’t remember which though.

Or not! according to this, on the 3B the power comes straight from the 30A bus in the fuse box. Check it’s connected underneath.