I mean you need to find segments from somewhere…

You can’t change the vin on the bcm via mode 7b/3b commands it’s not supported. You can as I have done write a custom kernel download to the bcm, then up run it to download a new vin to the bcm.

Or you can simply replace or reprogram the eeprom with a new vin

Thanks yes you are correct it has a dedicated signal from receiver to bcm.

what about a list of 2 byte nodes for 11 bit header CAN?
C9 = engine rpm

E9 or 0x3E9 ? speed?

OK So I cannot find schematics for my trax but found some for the same part number BCM in a colorado/canyon. Looks like the BCM is the RCDLR so it just has an antenna directly into it. I might see the bcm still transmit a CAN message to or from onstar, because onstar can lock and unlock the doors. I...

Because it was a used PCM, and I wanted to flash it with new code. I wound up using efi live.

Hey guys I cannot make heads or tails of out these logs I took from my vehicle all computers on the buss. Using GMLAN bible as that is the only real resource I could find. I am trying to find the RFA messages being sent from the RCDLR to BCM I want to add some code in the BCM to output to a relay wh...

Got it it’s 12 in front to send larger blocks.

I’ve got a decent skeleton going in C all the way up to going into 4x mode and sending data to module via vpw mode 36. That’s when I’m having trouble. First one is that it seems to after sending 0xC1 0x01 to enter 4x it shifts the data read back by 2-4 bytes but is inconsistent meningitis it a real ...

It’s loosing coms now but not executing code I put a simple code that moved aa to the vin. It resets after 15-20 seconds then coms come back. I think it’s jumping to the pointer at least