I got a call from the local service center earlier this afternoon with an update. They informed me that my car's drive unit would be replaced. Apart from that, the only concrete piece of information about the failure that they had to share was that the pyro fuse had blown. (This fact apparently had been relayed to the SC by Tesla Engineering who had reviewed the vehicle logs.)
Please help me understand this. I thought that if the pyro fuse blows, it isolates the high-voltage battery. But after I heard the initial “bang” from the rear of my car and I lost power to the wheels, the motor appeared to continue to respond to accelerator pedal inputs by revving up (as evidenced by the rear end of the car shaking/shuddering and emitting loud noises after pressing the accelerator pedal on 2 separate occasions, and also by the speed on the speedometer rising up independent of the wheel speed at the same time as the shaking and noise). Additionally, the AC continued to blow cold air for at least another 30 minutes despite 95F outside temps.
If the pyro fuse had actually blown, wouldn’t neither of these things be possible? (I.e., the motor wouldn’t rev up and the A/C compressor wouldn’t run because neither would have any power available to them?)
Or am I misunderstanding what the pyro fuse does?
Or am I grossly misinterpreting some other critical detail? (Which has certainly been known to happen, including as recently as 6 posts ago.)