Could you give us more details on solely writing info to the DIM?Posting to the bus is tricky for several reasons:
- Most (if not all) message-types are repeatedly transmitted by the car (up to 35 times/second). This means that a frame posted by you is almost immediately overruled by an ordinary frame. Preventing this is a challenge.
- You are writing frames with the same identifier as normal car frames. To prevent collisions (possibly resulting in bus-offs), special actions must be taken.
- Other actions are needed to prevent the system from generating/storing all kinds of DTC's.
- Be prepared to visit the dealer multiple times for DTC clearing (or get your own equipment to do so).
But the good news is: It can be done!