Hacker News Reader

How do you control windows over OBD2? I've never seen any universal car control over OBD2, only specific model/ECU tuning.

View on HN

this was my question as well, like other people have pointed out OBD2 can get you diagnostic information but cannot actually control movement of vehicle or other parts on the car

(Some?) modern cars expose a CAN bus via the OBD port. There typically are pins that adhere to the OBD2 spec as well as additional pins for the CAN bus.

On my car (Mk6 VW) there are multiple CAN buses which are separated by a gateway device. A device plugged into the OBD port has to negotiate with the gateway in order to access the other buses, but once it has done so can control the windows, lighting, instrument cluster, etc.

Reply on news.ycombinator.com