Here is the info for the 04 Sentra, I do not know what the spec-v is.
DIRECTWIRE™ WIRING INFORMATION - NISSAN / SENTRA / 2004 / Remote Start
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12volts WHITE/ red (40A) + ignition harness
Starter BLACK/ white + ignition harness
Second Starter BLACK / YELLOW + ignition harness
Ignition BLACK/ red + ignition harness
Second Ignition N/A
Third Ignition N/A
Accessory white + ignition harness
Second Accessory WHITE/ blue + ignition harness
Keysense blue/white + ignition harness
Power Lock gray - SECU right of column, pin 23
Power Unlock PURPLE / red - SECU right of column, pin 35
Lock Motor RED / black 5wi SECU right of column, pin 15
Unlock Motor blue/red 5wi SECU right of column, pin 13
Parking Lights+ WHITE/ red or RED / blue + headlight switch or driver kick
Parking Lights- N/A
Hazards ORANGE / black (w/keyless only) - SECU right of column, pin 7
Turn Signal(L) GREEN/ black + turn signal switch
Turn Signal(R) GREEN/ YELLOW + turn signal switch
Reverse Light GREEN/ YELLOW + driver kick, harness to rear
Door Trigger see notes - SECU right of column
Notes: Vehicles with power door locks, the driver door is red in pin 29, and the passenger doors are RED / white in pin 28. Use both wires and diode isolate each.
Vehicles without power door locks, the door trigger/dome light is RED / white in the driver kick, harness to rear.
Dome Supervision RED / yellow - SECU right of column, pin 8
Trunk/Hatch Pin RED / black - SECU right of column, pin 38
Hood Pin N/A
Trunk/Hatch Release red - trunk release switch
Power Sliding Door N/A
Factory Alarm Arm lt. GREEN/ red - SECU, right of column, pin 41
Factory Alarm Disarm WHITE/ blue - SECU, right of column, pin 30
Disarm No Unlock see factory alarm disarm
Tachometer NOT GREEN / WHITE or BLACK/ yel ac any ignition coil
Wait to start N/A
Brake Wire RED / green + brake pedal switch
Parking Brake yellow/black - parking brake switch or driver kick
Horn Trigger WHITE/ green - horn switch or SECU, pin 19
Memory Seat 1 N/A
Memory Seat 2 N/A
Memory Seat 3 N/A
Interface Module: Category:
Immobilizer Bypass Required:
Yes Type:
Transponder
Part #: OM-Nissan-1
Alternate Part1 #: 556UW
Alternate Part2 #: DesignTech 20402
Alternate Part3 #: DesignTech 29402
Notes: Standard on 2.5S models. Optional on SE-R and Spec V models.
Smart Starter Kill Relays: Not Available
warning
This wiring information is being provided free of charge on an "as is" basis, without any representation or warranty. It is your responsibility to verify any circuit before interfacing with it using a digital multimeter.
Directed Electronics assumes no responsibility with regards to the accuracy or currency of this information. Proper installation in every case is and remains the responsibility of the installer. DEI assumes no liability or responsibility resulting from improper installation, even in reliance upon this information.
Hope this helps.