Thanks for the good info. It's good to know that I don't need the relay so I can stop scratching my head on that one! I tried making most of my connections as per the DirectWIre Vehicle Info Sheet emailed to me when I purchased the system. Here are the wire connections I have:
Viper Wire #/Color---Description----Tacoma Wire Color
H1/1 Red -----12V Constant-------White
H1/2 Black-----Chassis Ground----Ground
H1/3 Brown----Siren Output-----Positive Wire leading to siren
H1/4 WHITE/ Brown ------Parking Light Isolation wire ---- N/A?
H1/5 White----Parking Light Output(-)----PURPLE / Red in 22pin Plug, Pin 9
H1/6 Orange---(-500mA) GWA Output------N/A?
Door Lock
1 Blue----(-500mA) Unlock Output---RED / Yellow White 12pin plug, Pin 8
2 Not Connected
3 Green---(-500mA)Lock Output--BLACK/ Blue White 12pin plug, Pin 3
H2/1 Pink/White---Ign 2/Flex output----N/A?
H2/2 Blue/White---2nd Status/Rear Defog Output----N/A
H2/3 RED / White----Trunk Release Output------------N/A
H2/4 BLACK / YELLOW-----Dome Light Output-----------N/A?
H2/5 Dark Blue-----Status Output------------------N/A?
H2/6 WHITE/ Black---------AUX 3 output-------------N/A
H2/7 WHITE/ Violet--------AUX 1 Output-------------N/A
H2/8 ORANGE / Black--------AUX 4 Output-------------N/A
H2/9 Gray-------------Hood Pin Input--------------Hood pin
H2/10 Blue-----------Trunk Pin--------------------N/A
H2/11 WHITE/ Blue--------Activation Input----------N/A?
H2/12 Violet/White--------Tach Input--------------Wire @ OBDII plug?
H2/13 BLACK/ White-----Neutral Safety/Prking Brake Input----Parking Brake Switch
H2/14 GREEN/ Black----Farctory Alarm Disarm Output---Blue/Black Wht 12pin plug Pin 12
H2/15 Green-----------(-)Door Input--------------Split to 3 wires Via Diodes?
H2/16 BROWN / Black------Horn Honk Output----------N/A?
H2/17 Pink------------Ignition 1 output----------N/A?
H2/18 Violet----------(+) Door Input-------------Use instead of H2/15?
H2/19 Violet/Black---- AUX 2 output--------------N/A
H2/20 Brown-----------Brake Shutdown Input--------GREEN / WHITE @ brake switch
H2/21 Violet / YELLOW----Starter Output------------Relay?
H2/22 Gray/Black-------Diesel WTS----------------N/A
H2/23 Orange------------Acc. Output--------------N/A
H2/24 GREEN / WHITE--------Factory Alarm Arm Out---Gray 12pin Plug Pin 9
H3 Connections at Ignition Switch
H3/1------------Not Connected--------------------
H3/2 RED / Black---------Fused 12V Acc/Starter Input---White
H3/3 pink/Black--------Flex Relay Input---------------N/A
H3/4 Pink/White---------Ignition 2-------------------BLACK / YELLOW
H3/5 Red----------------Fused Ign 1 Input------------WHITE/ Red
H3/6 Green------------Starter Input------------------Black (Split) Key Side
H3/7 Violet----------Starter Output-----------------Black(Split) Car side
H3/8 Orange----------Acc output-----------------------Blue/Red
H3/9 RED / White-------Fused 12V Ign. 2-----------------White
H3/10 Pink-------------Ignition 1 Input--------------BLACK/ Red
Sorry there are so many question marks. My truck does have a factory alarm system.