Set a body of suitable weight on the seat.
Usually it is only pick up truck type vehicles that have an air bag turn off and it is located on the passenger side dash. If you don't see a turn off switch or key on the passenger side dash then you probably cna't turn it off.
Will have to go onto a Land Rover computer, or aftermarket version. The fault will most likely be a seat belt pre tensioner needing replacement.
Hold the reset button
No
The knob that adjusts the driver side mirror also adjusts the passenger side mirror. Simply turn the knob to the right to adjust the passenger side, and turn to the left to adjust the driver side. Leaving the knob in the middle, neutral position will keep the mirrors from changing if the knob is hit.
with the key in the drivers side door turn to the left
Yes, its located in the back of the stereo. Depending on the year and model of your Land Rover. In my 99 discovery 1 to remove the radio you need a number 9 tamper-proof torx precision driver. insert the driver into the holes on either side and turn about 10 turns anticlockwise. ( these screws DO NOT come out of the radio DO NOT FORCE THEM!)
sitting in the pass.seat should turn it on
This is the turn signal bulb in the front bumper - passenger's side.
I believe that normally headlight wipers only work occasionally, at set intervals when the car thinks that they may be dirty.
No, it is illegal to turn the passenger air bag off without prior approval from the NHTSA.
Several things can cause your land rover not to turn over. I would start with checking the battery. Is it fully charged? Do you hear a click when you try to start it. If so, could be a weak battery or a faulty starter solenoid. Those two are the most probable.