The AP won't control whether the car cranks or not, but a low/dead battery would. I would start there. If the battery checks out, put a large wrench on the crank pulley and see if you can spin the engine over by hand, maybe something failed and locked the crank.
86 FZ 750
98 Legacy GT Wagon, silver (original owner, 152K miles)
**COBB - full exhaust (includes EL coated header), SS, F & R STB's, rear bar, stage-2 DOHC heads (P&P w/street cams) & stickers.
--Non-COBB - 99 RS 16x7 rims, 225/50-16 P Zero Nero M&S, ACT clutch, Exedy LW flywheel, Grimmspeed intake spacers, SS brake lines, modded WRX rear bar mounts & a Crawford modded STi NA SB, in & running!
99 Impreza L Wagon, silver
**COBB - F & R STB's (wife's car, original owner, 110K miles).