2000 VW Volkswagen Jetta No OBD II Link

Year/Model
2000 VW Jetta

Problem
No link to OBD II

History
Owner tried to smog vehicle and when tech connected obd2 scanner to vehicle, would receive notice of no link active.

Diagnostic
Customer brought vehicle to our shop. We tried to connect VAG com scanner to vehicle and found no link either. Checked all fuses, everything ok. Saw vehicle was wired up with aftermarket stereo. Removed after market stereo to inspect wiring. Found radio was providing power to the KBus line in the vehicle and was jamming the system. Disconnected all aftermarket wiring and was then able to scan vehicle for codes. Smogged vehicle.

Repair
Disconnected radio from the KBus wire as see in the picture. The radio wiring harness wire was blue with a white stripe. The vehicle wiring was the black plug with the gray with the white stripe. I left the blue wire hooked up for the aftermarket power antenna wire. Checked the system to see if it can scan, ok. The VAG com did show a fault for no stereo but that is because the aftermarket can not interact with the BUS system

Just disconnect the blue/white wire or which ever one corresponds to the wiring position shown in the plug.

Disclaimer
Use this at your own risk, only reporting my own findings. If you found this helpful, feel free to donate so i can keep posting up more useful tips. If this was helpful, give it a quick post below, makes me feel better :)