I've done installs on H2's and it's not fun. I would recomend going to an actually stereo shop where they have a MECP certified installer and getting it done there. If you know what your doing then the wiring isn't too bad it's the removal of the dash thats a pain. If you really wanna do it yourself then here is the wiring. This list tells you the wire function, color of the wire the polarity and the last thing is the location.
The BCM is the Body control module it is located behind the headlight switch area in the dash easiest way to get to it is to remove the headlight switch cluster.
Your also gonna need a Immobilizer Bypass,
Part number:556LW (it's from DEI)
Some notes for the Bypass: The Passlock II wire colors are yellow, orange/black to black, and red/white (not used)
12volts red (40A), red or red/wh (40A)+ ignition harness
Starter yellow + ignition harness
Second Starter N/A
Ignition pink + ignition harness
Second Ignition white + ignition harness
Third Ignition N/A
Accessory orange + ignition harness
Second Accessory brown + ignition harness Keysense lt. green - BCM, lt. blue plug, pin A1
Power Lock lt. blue - BCM, purple plug, pin B3
Power Unlock white - BCM, purple plug, pin B2
Lock Motor gray 5wi driver door module in door
Unlock Motor tan 5wi driver door module in door
Disarm Defeat tan 5wi driver rear door harness
Parking Lights+ brown (L), brown/white (R) + driver kick, harness to rear
Parking Lights- gray/black - BCM, brown plug, pin B2
Hazards white - hazard switch
Turn Signal(L) dk. green + turn signal switch
Turn Signal(R) lt. green + turn signal switch
Door Trigger see notes - see notes
Dome Supervision gray/black + BCM, black plug, pin E
Trunk/Hatch Pin pink/black - BCM, purple plug, pin A1
Hood Pin N/A
Trunk/Hatch Release N/A Power Sliding Door N/A
Factory Alarm Arm arms on lock
Factory Alarm Disarm lt. green - driver door module in door
Disarm No Unlock see factory alarm disarm
Tachometer white ac PCM, green plug, pin 10
Horn Trigger black/yellow to black - switch or BCM, gray plug, pin B9 Memory Seat 1 red + driver door module in door
Memory Seat 2 pink + driver door module in door
Memory Seat 3 N/A +
These are just what is what and where, how to hook it up is up to you. I am not responsible if something is wired incorrectly this is the information that is given to me by directed who is the manufacturer of the viper. Good luck. Hope this helped.