Re: is this possible? copy and save oem cals
Posted: Tue Feb 16, 2021 12:41 am
Ah. I just tried it on an older 2016 BCM. It worked.Gatecrasher wrote:It came out of a wrecked 16 Corvette. PN 13510531. Looks like they only ever issued one OS for this thing. 13511493. It's about as crude as you can get for this test, so maybe that's working in my favor? I've got just the BCM on my desk, hooked to an MDI. I'm copying and pasting commands one by one with the DrewTech J2534 software. I set a periodic tester present message at a rate of 4.5 seconds, and sent a mode $28 to disable normal communication, mainly to keep the logging noise down. I could have set a filter instead. Everything else was done in the scratchpad field on the DrewTech software.
Just for fun, I cut power to it since I don't have a way to gracefully shut it down yet. MEC was still at 0x10 after a restart. I guess it didn't decrement to 0x0F because it wasn't a proper ignition cycle. I definitely didn't return to 0 though. The write stuck.
Are you doing this over high speed or low speed CAN? Mine was done on high speed. The BCM will respond to some things on low speed, but doesn't seem to like doing diagnostics on that bus.
Code: Select all
14:28.412109,CAN,0x00000001,00 00 02 41 01 3E 14:28.423638,CAN,0x00000000,00 00 06 41 01 7E A0 00 00 00 00 00 14:32.605241,CAN,0x00000001,00 00 02 41 02 1A A0 00 00 00 00 00 //Check MEC 14:32.613478,CAN,0x00000000,00 00 06 41 03 5A A0 00 00 00 00 00 //MEC at 0 14:32.912563,CAN,0x00000001,00 00 02 41 01 3E 14:32.923454,CAN,0x00000000,00 00 06 41 01 7E A0 00 00 00 00 00 14:37.412543,CAN,0x00000001,00 00 02 41 01 3E 14:37.423278,CAN,0x00000000,00 00 06 41 01 7E A0 00 00 00 00 00 14:41.912521,CAN,0x00000001,00 00 02 41 01 3E 14:41.923064,CAN,0x00000000,00 00 06 41 01 7E A0 00 00 00 00 00 14:46.412504,CAN,0x00000001,00 00 02 41 01 3E 14:46.422880,CAN,0x00000000,00 00 06 41 01 7E A0 00 00 00 00 00 14:47.948231,CAN,0x00000001,00 00 02 41 02 27 01 00 00 00 00 00 //Request seed 14:47.952796,CAN,0x00000000,00 00 06 41 04 67 01 2E 66 00 00 00 //Receive seed 14:50.912555,CAN,0x00000001,00 00 02 41 01 3E 14:50.922688,CAN,0x00000000,00 00 06 41 01 7E 01 2E 66 00 00 00 14:51.042595,CAN,0x00000001,00 00 02 41 04 27 02 B0 35 00 00 00 //Send key 14:51.052679,CAN,0x00000000,00 00 06 41 02 67 02 2E 66 00 00 00 //Key accepted 14:55.412922,CAN,0x00000001,00 00 02 41 01 3E 14:55.422497,CAN,0x00000000,00 00 06 41 01 7E 02 2E 66 00 00 00 14:59.912831,CAN,0x00000001,00 00 02 41 01 3E 14:59.922297,CAN,0x00000000,00 00 06 41 01 7E 02 2E 66 00 00 00 15:04.412804,CAN,0x00000001,00 00 02 41 01 3E 15:04.422113,CAN,0x00000000,00 00 06 41 01 7E 02 2E 66 00 00 00 15:08.009065,CAN,0x00000001,00 00 02 41 03 3B A0 10 00 00 00 00 //Write to MEC 15:08.011937,CAN,0x00000000,00 00 06 41 02 7B A0 2E 66 00 00 00 //MEC accepted 15:08.912418,CAN,0x00000001,00 00 02 41 01 3E 15:08.921923,CAN,0x00000000,00 00 06 41 01 7E A0 2E 66 00 00 00 15:13.412390,CAN,0x00000001,00 00 02 41 01 3E 15:13.421725,CAN,0x00000000,00 00 06 41 01 7E A0 2E 66 00 00 00 15:17.912372,CAN,0x00000001,00 00 02 41 01 3E 15:17.921513,CAN,0x00000000,00 00 06 41 01 7E A0 2E 66 00 00 00 15:22.412347,CAN,0x00000001,00 00 02 41 01 3E 15:22.421333,CAN,0x00000000,00 00 06 41 01 7E A0 2E 66 00 00 00 15:26.912327,CAN,0x00000001,00 00 02 41 01 3E 15:26.921125,CAN,0x00000000,00 00 06 41 01 7E A0 2E 66 00 00 00 15:27.970045,CAN,0x00000001,00 00 02 41 02 1A A0 00 00 00 00 00 //Re-read MEC 15:27.981105,CAN,0x00000000,00 00 06 41 03 5A A0 10 66 00 00 00 //MEC at 10 15:31.412368,CAN,0x00000001,00 00 02 41 01 3E 15:31.420937,CAN,0x00000000,00 00 06 41 01 7E A0 10 66 00 00 00
They must have removed the ability to rewrite the MEC on the newer OS's.