Compustar 2W900FM, 2001 GMC Sierra

I am installing a Compustar 2W900FM to a 2001 GMC Sierra. There is currently a remote starter in the truck that I installed last year (Design Tech).

A few questions about the wiring:

1) Pin 5 (Blue) of CN1 is labeled 2nd starter, or 2nd accessory, or 2nd ignition. I assume this connects to trucks 2nd ignition (White). I then would need to adjust jumper.

2) CN1 has a 40 amp relay attached to it. The relay connects to the yellow start wire of CN1 and the red wire from green+red of CN1. The relay has a yellow wire and a yellow/black wire which I assume interrupts the vehicle start wire (yellow) for anti-grind. There is also a purple pigtail with a female connector on the end, which I am unsure where to connect.

The notes for CN2 Pin 2 (RED / black) says:

"This wire is a (-) 2nd starter 200mA output. Normally the only vehicle this would be used on Nissan's and older Ford's. You MAY connect this wire to the purple pigtail of the additional relay on CN#1. This will result in a (+) trigger output for the 2nd starter on the blue wire of the same relay".

There is no blue wire on this relay, but I suspect they mean the blue wire on CN1 Pin 5 (ignition 2).

Anyone know?

Also, CN2 Pin 3 (Violet) has a mating male connector that would plug right into the purple pigtail on the relay and is labled as:

"This wire is the (-) Negative when armed out. It will provide a (-) output anytime the unit is armed or remote started. This wire is pre-wired into the starter-kill. This wire could be used for adding a window roll-up."

It seems like this wire (Pin 3) should be connected to the purple pigtail instead of Pin 2 since it has a mating connector.

Anyone know?

you sure you should be installing this?

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South Side Audio
2501 S. High St
Columbus, OH 43207

Wire/Function	CM3000	Colour	Location/Description	Polarity
PASSIVE ANTI-THEFT	BLACK (CN2)	YES	PASSLOCK 2	SEE NOTES
12 VOLTS	RED (CN1)	Red	Ignition harness	+
IGNITION	GREEN (CN1)	Pink	Ignition harness	+
IGNITION 2	GREEN (CN2) + Relay	White	Ignition harness	+
ACCESSORY	WHITE (CN1)	Orange	Ignition harness	+
STARTER	YELLOW (CN1)	Yellow	Ignition harness	+
KEY SENSE		Lt.green	Ignition switch harness	-
TACH SIGNAL	YELLOW/BLACK (CN3)	See notes
The 4300 V6 engine still uses a single coil on the top of the engine, tach wire is WHITE. On the V8 engines, there is a coil for each cylinder, each with a 4 pin plug. Each plug contains a BLACK, BROWN & PINK, as well as a 4th wire which changes color on each coil. This 4th wire can be used as your tach reference, set your remote starter for a 1 cylinder signal. You can also use a WHITE at pin-10 of the 80-pin connector on the PCM at the left front of the engine compartment for a 8 cylinder signal.
DIESEL TACH SIGNAL		White	Pin-A2 behind instrument cluster	AC
LOCK	BLUE/BLACK (CN4)	Lt.blue	At Body Control Module	+
In the 24-pin plug on the far left.
UNLOCK	BLUE (CN4)	White	At Body Control Module	+
In the 24-pin plug on the far left.
DRIVER LOCK MOTOR		Gray	At BCM below column (brown plug)	+
DRIVER UNLOCK MOTOR		Tan	At BCM below column (brown plug)	+
PASSENGER UNLOCK MOTOR		Tan	At BCM below column (brown plug)	+
GLO-PLUG SIGNAL	BRN/WHITE(+) or BROWN(-) (CN3)	Blue	Behind instrument cluster	-
DOORPIN	RED / WHITE(-) or RED(+) (CN3)	Tan & Lt.blue	At Body Control Module	-
Tan (driver's door) is in the 16-pin plug on the far right and the Blue/white (pass. Door) in on the 24-pin plug in the center of the module.
FACTORY ARM	ORANGE (CN5)	Tan	At Body Control Module	-
Located is 16-pin plug on far right. Pulse the TAN wire at the same time as the lock wire to arm the factory alarm. Pulse ground to the LT.GREEN wire to disarm the alarm.
FACTORY DISARM	ORANGE / WHITE (CN5)	Lt.green	At Body Control Module	-
Located is 16-pin plug on far right. Pulse the TAN wire at the same time as the lock wire to arm the factory alarm. Pulse ground to the LT.GREEN wire to disarm the alarm.

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BRAKESWITCH	LT.BLUE/WHITE (CN3)	White	At switch above brake pedal	+
PARKLIGHTS	GREEN / WHITE (+) (CN1) or (-) (CN2)	Lt.blue	At light switch harness	+
HAND BRAKE	LT.BLUE (CN3) Manual only	Lt.blue	At plug on parking brake lever	-
HORN	WHITE (-) (CN5)	Black	At steering column	-
CLUTCH SWITCH	Manuals only (see inst. Guide)	Purple	At switch on top of clutch pedal	TYPE 1
DRIVER WINDOW UP		Dk.blue	At window switch in driver's door	REV POL
The driver's window switch is negative out to the other doors. See the tech diagram for wiring options.
DRIVER WINDOW DOWN		Brown	At window switch in driver's door	REV POL
The driver's window switch is negative out to the other doors. See the tech diagram for wiring options.
PASSENGER WINDOW UP		Dk.blue	At switch in passenger side door	REV POL
The driver's window switch is negative out to the other doors. See the tech diagram for wiring options.
PASSENGER WINDOW DOWN		Brown	At switch in passenger side door	REV POL
The driver's window switch is negative out to the other doors. See the tech diagram for wiring options.
HEADLIGHTS		White	At light switch harness	+
DIMMER		Green	At light switch harness	+
VSS WIRE		Dk.GREEN / WHITE	At VCM in front left engine compartment	4000ppm
Located at pin-3 on the C4 24-pin plug (4.3L only). Located at pin-50 of C2 80-pin connector for all other engines.
DATABUS INTERFACE		Pin-2(top row from left)	Diagnostic plug below dash	DATA
PASSLOCK DATA		Yellow	In 3 wire harness from ignition switch	DATA
PASSLOCK GROUND		Black or ORANGE / black	In 3 wire harness from ignition switch	-

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I have done hundreds of Compustar units in the past and was curious as to the harness and fusing that your referring to. I've never seen a Compustar unit fused at 40 amps before and also what is the model CPU that you have ? From what your describing from above, it should be a CM4200 and this is a remote start only system with the 2 way upgrade antenna and remote controls.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

The unit is a CM4200A with 2 way remote.  Pin 1 and 3 of CN1 are fused at 30 amps for the constant 12V.  The 40 amps is what is stamped on top of the relay which is attached to the red of the green+red Pin (8 I think, unit is not in front of me currently) and the yellow starter wire.  The relay has a purple pigtail which is what I am questioning.  I don't know if I should use CN2 Pin 2 which the notes say MAY be connected to it, or Pin 3 which has a mating connector to the pigtail.  Or neither.  The wiring diagram does not show the relay or the pigtail.