2000 Nissan Frontier 2.4L

I've got a 2000 Nissan Frontier King Cab 2.4L and I'm looking for the VSS Vehicle Speed Sensor wire in order to hook up a navigation system.  Would anyone possibly be able to help me out?

2000 Nissan Frontier

Item	Wire Color	Polarity	Wire Location
12V	green	+	ignition harness
STARTER	BLACK / YELLOW	+	ignition harness
IGNITION	BLACK/ white	+	ignition harness
ACCESSORY	RED / yellow	+	ignition harness
SECOND ACCESSORY	none
TACHOMETER	pink/blue or black		instrument cluster or ECM *2
POWER LOCK	yellow *7	-	*3
POWER UNLOCK	yellow/red *7	-	*3
PARKING LIGHTS +	blue/red		steering column
PARKING LIGHTS -	none
DOOR TRIGGER	RED / black *4	-	*3
HEADLIGHTS	red, RED / blk *5	+	steering column
WIPERS	*6	-	steering column
LF WINDOW UP/DN	blue - blu/blk	A	at drivers door switch
RF WINDOW UP/DN	blu/yel - blu/wht	A	at drivers door switch
LR WINDOW UP/DN	none
RR WINDOW UP/DN	none
TRUNK/HATCH PIN	none
HOOD PIN	BLACK/ pink	-	*3
TRUNK/HATCH RELEASE	none
FACTORY ALARM ARM	arms with lock
FACTORY ALARM DISARM	disarms with unlock
HORN TRIGGER	lt grn/red or brown	-	steering column
BRAKE WIRE	BROWN / red	+	brake pedal switch
LOCK MOTOR	blue		*3
UNLOCK MOTOR	GREEN / WHITE		*3
DISARM DEFEAT	purple or blu/red *9		*3
DISARM NO UNLOCK	*8
DOME SUPERVISION	none	non	none
SPEED SENSE	dk. GREEN/ black	2	ECM *2
SUN ROOF OPEN/CLOSE	none	non	none
SUN ROOF LIMIT	none	non	none
LF SPEAKER	none	non	none
RF SPEAKER	none	non	none
LR SPEAKER	none	non	none
RR SPEAKER	none	non	none
RADIO 12V	none	non	none
RADIO GROUND	none	non	none
RADIO SWITCH	none	non	none
RADIO ILLUMINATE	none	non	none
POWER ANTENNA	none	non	none
Notes:	*1 Not required for remote start. *2 The ECM is located below the heater box to the right of the accelerator pedal, behind trim panel. The tach is in the top row, 3rd pin left of center of the plug. The VSS is in the 2nd row from the top, 4th pin right of center. *3 Located at the Smart Entrance Control Unit above the hood release in the drivers kick panel. The door lock wires only meter when turn the key in either door key cylinder. *4 If equipped with factory dome light delay, use GREEN/ red(-) for the drivers door and GREEN/ black(-) for the passenger door. Diode isolate each wire. The RED / black may also be found in the drivers A pillar. *5 These wires are for the low beams. For the high beams use RED / green(+) and RED / white(+) at the same location. *6 Use WHITE/ blue for intermittent, WHITE/ red for low, and blue/white high. *7 Unlock requires a double pulse. On vehicles without the factory alarm, can also find lt. GREEN/ red for lock and brown for unlock. *8 A single pulse to the unlock wire will disarm the factory alarm without unlocking the doors. *9 It is purple on the 2 door models, and blue/red on the 4 door.

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How do I access the ECM?  It seems impossible to get to...thanks