The sensitivity level is set to high on the vehicle. It should be set to alarm if car is physically touched.
I have a '03 and there is an alarm if you leave tour lights on.
If your 2002 Ford Explorer alarm system goes off by itself, you probably have a wire that is exposed or a connection that is not completely closed. Check all wires for the alarm system and reset the system itself.
"Engine diagram" is not clear. Google has a lot of resources.
Where is the fuse box in the 2002 Mercedes Benz s430
where is the camshaft sensors located on Mercedes 2002 1800cc engine
The 2002 Mercedes-Benz G-Class has a V8 engine.
The 2002 Mercedes-Benz M-Class has a V6 engine.
The 2002 Mercedes-Benz SL-Class has 24 valves.
The 2002 Mercedes-Benz E-Class has a V6 engine.
The 2002 Mercedes-Benz S-Class has a V8 engine.
The 2002 Mercedes-Benz G-Class has 24 valves.
The 2002 Mercedes-Benz CL-Class has a V8 engine.