In the AutoZone instructions it says:
1) Position the vehicle with the front wheels in a straight ahead position.
2) Disconnect both battery cables, negative cable last. [WAIT at least 1 minute for the air bag backup power supply to deplete its stored energy before continuing.]
3) Disconnect the air bag backup power supply.
4) ...
Where is the "air bag backup power supply" that it references in #3 to disconnect?
