Transfer Control Unit Terminals And Reference Value

WARNING: This page is about a different car, the 2006 Nissan Xterra. However, it is still accessible from the selected car via links, so may be relevant.

Data are reference value and are measured between each terminal and ground.

TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE

Terminal	Wire color	Item	Condition		Data (Approx.)
27	L	Actuator motor power supply	Ignition switch: ON		Battery voltage
27	L	Actuator motor power supply	Ignition switch: OFF (5 seconds after ignition switch is turned OFF)		OV
28	SB	Actuator motor (+)	Vehicle stopped Engine running For A/T models, A/T selector lever "N" position with brake pedal depressed. For M/T models, M/T shift lever neutral position with clutch and brake pedal depressed.	When 4WD shift switch is operated (while actuator motor is operating)	Battery voltage
28	SB	Actuator motor (+)		When 4WD shift switch is not operated	OV
31	G	Actuator motor (-)		Always	OV
42	LG	Transfer shift high relay	Vehicle stopped Engine running For A/T models, A/T selector lever "N" position with brake pedal depressed. For M/T models, M/T shift lever neutral position with clutch and brake pedal depressed.	4WD shift switch: 2WD to 4H or 4H to 4LO or 2WD to 4LO	OV
42	LG	Transfer shift high relay		Except the above	Battery voltage
47	O	Transfer shift high relay monitor		4WD shift switch: 2WD to 4H or 4H to 4LO or 2WD to 4LO	Battery voltage --> OV
47	O	Transfer shift high relay monitor		Except the above	OV
48	R	Transfer shift low relay monitor		4WD shift switch: 4LO to 4H or 4H to 2WD or 4LO to 2WD	Battery voltage --> OV
48	R	Transfer shift low relay monitor		Except the above	OV
50	Y	Transfer shift low relay		4WD shift switch: 4LO to 4H or 4H to 2WD or 4LO to 2WD	OV
50	Y	Transfer shift low relay		Except the above	Battery voltage

CAUTION: When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.