My 2001 isuzu rodeo has been failing to start. Anti theft arms w door opened

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Hope this helps

One way is to row your window down, step out of the vehicle, press lock on your key fob, reach inside the window, unlock door and open door. The alarm should go off.

In general, the neutral safety switch prevents the engine from starting without disengaging the clutch

If you have lights the battery is probably ok.
A mechanic would check for battery voltage at the starter with a meter or test light and then trace back to the key switch. You would have a neutral safety switch or clutch switch in the circuit to keep you from cranking the engine in gear.
If it is an automatic and you can crank it in neutral, the safety switch has failed.

This could be the problem. If your dash indicator is showing reverse but the transmission is in park it could be the safety switch. I'm not talking about the safety switch in the transmission though. In automatics they put a second switch to kill the starter from engaging. You need to adjust the linkage. If your shifter isn't actually on the column but the indicators are there is a cable that attaches the floor shift to the column and that is adjustable. Put the Floor shifter in Park and turn the column section nearest the dash by hand until you find park. Then adjust the cable length as needed. If all you have is the column shift it is still a cable adjustment. Set the emergency brake, drop the shifter to low 1 and adjust the cable linkage by loosening it on the transmission and manually move it all the way to low 1 then tighten it down then move the shifter to park and repeat teh adjustment process to verify that it is properly aligned. Lock the linkage back down and see if the vehicle will start, if it doesn't move the shifter to neutral and try to start the vehicle if the vehicle starts then check the column shift safety switch at the park position to make sure it is still in place and working. Typically, if the vehicle won't start in Park or Neutral it is more likely to be the Transmission neutral safety switch.

You have a blown EFI fuse.

If shifting into neutral works you may have a damaged parking safety switch. Some vehicles have one for neutral and one for park.

Be sure to check your battery and starting system too. A weak battery or worn starter solenoid are also likely causes.

Good luck and be careful!

If automatic....neutral safety switch or anti theft.
If manual trans....clutch safety switch or anti theft.

Could be your neutral safety switch, or it's not all the way in park. Broken or loose wires in the starting circuit. Inspect all wires and connectors at the battery, starter solenoid, and ignition switch. Or your starter pinion is jammed in the ring gear. Remove starter and inspect. Last but not least, your engine is seized. You don't want that one. Good luck.

Have someone look at the valve-train movement through the oil fill cap while you crank the engine. Be careful of the fan and pulleys in front of the motor while cranking the engine. if you don't see the camshaft rotating inside the oil fill cap then your timing belt has failed. Did you have to jump-start this Rodeo?