1. Whichever you prefer as they both operate the same. I just did one with the 556L, works fine.
2. Factory alarm will only arm and disarm from the factory remote.
3. Starter kill is possible, but you would have to go out to the PCM and grab the starter wire there. This really is not necessary as the vehicle has Passlock and factory anti-grind. There is no starter wire in the ignition harness at the key cylinder.
4. I energized the keysense in the 06 I just did using only the transistorized output from the starter, no relay needed.
Here is what DEI lists for the Equinox:
DIRECTWIRE™ WIRING INFORMATION - CHEVROLET / EQUINOX / 2005 / Remote Start
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12volts RED / white (x2)(common 30A) + ignition harness
Starter yellow (not for remote start) - PCM, blue plug, pin 23
Notes: Starter wire is not required for remote start. When the vehicle sees that the ignition wire has voltage and the two accessory wires lose voltage, it automatically cranks the starter.
The PCM is located in front of the driver strut tower, above the battery cover.
Second Starter N/A
Ignition pink + ignition harness
Second Ignition N/A
Third Ignition N/A
Accessory orange + ignition harness
Second Accessory brown + ignition harness
Keysense lt. green (required) - BCM, gray 24 pin plug, pin A8
Notes: The BCM is located in the center console, below the radio.
Power Lock lt. blue + BCM, pink plug, pin B4
Notes: The BCM is located in the center console, below the radio.
Power Unlock dk. blue + BCM, gray 24 pin plug, pin A3
Notes: The BCM is located in the center console, below the radio.
Lock Motor gray 5wi driver kick, door harness
Unlock Motor tan 5wi driver kick, door harness
Parking Lights+ brown + BCM, gray 24 pin plug, pin B7
Notes: The BCM is located in the center console, below the radio.
Parking Lights- lt. blue - BCM, gray 24 pin plug, pin B3
Notes: The BCM is located in the center console, below the radio.
Hazards same as turn signal wires
Turn Signal(L) lt. blue + turn signal switch
Turn Signal(R) dk. blue + turn signal switch
Reverse Light lt. green + kick panel, harness to rear
Door Trigger gray/black (D), tan/white (P) - BCM
Notes: The driver door trigger is gray/black in the pink plug, pin B8. The passenger doors trigger is tan/white in the gray 24 pin plug, pin B5. Use both wires and diode isolate each.
The BCM is located in the center console, below the radio.
Dome Supervision white - BCM, pink plug, pin B1
Notes: The BCM is located in the center console, below the radio.
Trunk/Hatch Pin ORANGE / black - BCM, pink plug, pin B12
Notes: The BCM is located in the center console, below the radio.
Hood Pin N/A
Trunk/Hatch Release N/A
Power Sliding Door N/A
Factory Alarm Arm factory remote only
Factory Alarm Disarm factory remote only
Disarm No Unlock with ignition and Passlock
Tachometer purple ac PCM, black plug, pin 61
Notes: The PCM is located in front of the driver strut tower, above the battery cover.
Can also go to any fuel injector and use the wire that is NOT pink.
Wait to start N/A
Brake Wire lt. blue + brake pedal switch
Parking Brake lt. blue - BCM, pink plug, pin B5
Notes: The BCM is located in the center console, below the radio.
Horn Trigger tan - BCM, pink plug, pin A3
Notes: The BCM is located in the center console, below the radio.
Memory Seat 1 N/A
Memory Seat 2 N/A
Memory Seat 3 N/A
Interface Module: Category:
Immobilizer Bypass Required:
Yes Type:
Passlock II
Part #: 556LW
Alternate Part1 #: 555LW
Alternate Part2 #: DesignTech 20402
Alternate Part3 #: DesignTech 29402
Notes: Standard on all models. The Passlock II wire colors are yellow, ORANGE / black, and ORANGE / white (not used).
Smart Starter Kill Relays: Relay Type:
Starter Relay Location:
Engine compartment fusebox, Driver side
Part #: 6402A
Notes: Cycle key slow during programming or customer over ride
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