I'm trying to control an instrument cluster from a 2008 Saab 9-3. It has 2 pins marked for I-Bus (both wires are green, continuity test shows they are tied together as shown here:
Some sites also call this instrument bus the GMLAN. I had no information on how does this bus works except "the data transfer rate of the I-bus is 33 kbits/s" and:
So I have disassembled the unit and looking for some IC markings, I have found a AU5790D which is a single wire CAN transciever. There is a site with various CAN IDs and messages for a 2001 Saab 9-3. (They have changed the bus, but hopefully they have kept the codes.) Reverse-Engineering the Saab 9-3 Instrumentation Bus (I-BUS)
After some research on the one wire buses, it has turned out that my Seeedstudios Can Shield is useless here. I have ordered the same chip, so I can emulate a 2 node network. My questions are:
- Is it possible to use the transciever without any specific CAN controller? (Directly wired to an Arduino)
- (If it is not) What type of CAN controller do I have to use between the MCU and the transciever?