Alarm Control, lights assembly, Oxygen sensor, power window

Both the controls for the alarm on my 1998 blazer just won't work. I have heard that when batteries are chaged the control must be reset pressing both lock and unlock buttons at the same time next to the vehicule, but this hasn't work. Maybe it is the vehicule's system that has some probleme.

I also want to change the headlights bulbs for 100 Watts ones with a relay system, but don't know how to disassemble them.

I'm also having a oxigen sensor problem and i want to read with a voltmeter the signal from the pre-cat oxygen sensor, Anyone knows which wire or contact or plug i should be looking for ?

My passenger power window wont work and i guess the motor is blown. I,ve heard that it is ribbeted inside the door. I want to get it out to get it rebuilded, are this motors sealed? How do i disassemble it?

Any advices??