===== strings =====
LIN_SYNC=0x55
SERVICE_HOOD_ID=0x12
SEAT_SECRET_ID=0x15
SEAT_MAGIC=AA55
MAINT_POS_OK=0x9001

===== notes =====
pid parity uses classic LIN protected identifier
checksum uses enhanced checksum
service build exports one 32-bit calibration word after AA55

===== leftover debug =====
"hood latch must be true before service routine"
"seat secret is mixed by engine auth"
