On 27/01/17 07:29, Cor van de Water via EV wrote:
Also, the LBC validation happens without disconnecting the aux battery.
I know for sure as I never disconnect the 12V battery and when I swapped
my pack for a complete replacement pack from Washington State, the
yellow light on the dash came on and my Leaf was in Limp mode while I
only disconnected the (non-energized, due to the contactors in the pack)
HV lines and the control bus.
Just wheeling the original pack back under my Leaf and swapping the
connectors removed the Limp mode, so I know for a fact that the Leaf
validates the battery upon pressing the power button while the aux
battery is connected continuously, so it seems that you were looking at
the wrong thing.
Probably a trace of the EV bus as soon as the power button is depressed
(when a *lot* of communication is happening) will tell the story.
You may start the trace as soon as the brake is pressed.
Thank you for this information Cor!
I have many captures of my car's startup on the EV Bus and unless my
hardware misses the important frames, I don't see anything special at
startup. 0x603 is sent once, is the first frame sent and always with
payload 00. A number of frames are sent with lots of bits set which
later contain valid data - for example the first couple of frames from
the LBC:
1 2017-01-26 21:47:24.907267 CAN 16 STD:
0x00000603 00
8 2017-01-26 21:47:24.993307 VCM Info 16 STD:
0x000001f2 08 64 00 00 00 01 01 06
65 2017-01-26 21:47:25.139218 LBC Battery V/A 16 STD:
0x000001db 7f e0 ff c6 00 00 00 de
66 2017-01-26 21:47:25.140191 LBC 0x1dc 16 STD:
0x000001dc ff ff ff ff 1f ff fc 6b
And I can see the VCM go through it's startup sequence (in 0x1f2 byte
5). However all the frames other than 0x603 are sent more than once per
second.
I'll capture startup from some more cars, identify which bytes are
different and use a man in the middle to selectively tamper with those
bytes and see what causes the car to reject the battery. Hopefully there
aren't too many differences! Carl at https://bluecars.nz/ has a leaf
system on the bench, so establishing the man in the middle won't be too
hard.
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