Specifications Between Transfer Control Unit Terminals

TRANSFER CONTROL UNIT TERMINAL CONNECTOR LAYOUT 

Fig 1: Identifying Transfer Control Unit Terminal Connector Layout

Courtesy of NISSAN MOTOR CO., U.S.A.

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

WIRE COLOR AND TERMINAL DESCRIPTION

Terminal	Wire color	Item	Condition		Data (Approx.)
1	GR	2-4WD shift solenoid valve	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD	0V
				4WD shift switch: AUTO, 4H or 4LO	Battery voltage
2	B/W	4WD shift indicator lamp (2WD indicator lamp)	2WD indicator lamp: OFF		Battery voltage
			2WD indicator lamp: ON		0V
3	B	Ground	Always		0V
4	Y/L	Transfer shift high relay	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4H to 4LO ("Wait" function is operating.)	Battery voltage
				Except the above	0V
5	W/B	4WD warning lamp	4WD warning lamp: ON		0V
			4WD warning lamp: OFF		Battery voltage
6	B	Ground	Always		0V
7	L	CAN-H	-		-
8	P	CAN-L	-		-
9	G/W	4WD shift switch (2WD)	Ignition switch: ON	4WD shift switch: 2WD	Battery voltage
				4WD shift switch: AUTO, 4H or 4LO	0V
10	L/W	Transfer dropping resistor	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: AUTO	4 - 14V
				4WD shift switch: 2WD, 4H or 4LO	Less than 1V
11	L	4WD shift indicator lamp (Lock indicator lamp)	Lock indicator lamp of 4WD shift indicator lamp: OFF		Battery voltage
			Lock indicator lamp of 4WD shift indicator lamp: ON		0V
12	W/G	4LO indicator lamp	4LO indicator lamp: OFF		Battery voltage
			4LO indicator lamp: ON		0V
13	G/B	Transfer shift low relay	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4LO to 4H ("Wait" function is operating.)	Battery voltage
				Except the above	0V
14	LG	Transfer motor relay	Accelerator pedal depressed Vehicle stopped Engine running Brake pedal depressed	4WD shift switch: 2WD	Battery voltage
				4WD shift switch: AUTO or 4LO (A/T selector lever "P" or "N" position)	Battery voltage (0V for approx. 2 sec. after shifting to "P" and "N".)
				4WD shift switch: AUTO or 4LO (Except for A/T selector lever "P" or "N" position)	0V
				4WD shift switch: 4H (A/T selector lever "P" position)	Battery voltage (0V for approx. 2 sec. after shifting to "P".)
				4WD shift switch: 4H (Except for A/T selector lever "P" position)	0V
15	L/B	ATP warning lamp	ATP indicator lamp: ON		0V
			ATP indicator lamp: OFF		Battery voltage
16	Y/R	Power supply	Ignition switch: ON		Battery voltage
			Ignition switch: OFF		0V
18	O	4WD shift switch (4H)	Ignition switch: ON	4WD shift switch: 4H	Battery voltage
				4WD shift switch: 2WD, AUTO or 4LO	0V
19	L	Clutch pressure solenoid valve	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: AUTO	1.5 - 3V
				4WD shift switch: 2WD, 4H or 4LO	Less than 1V
21	BR	4WD shift indicator lamp (AUTO indicator lamp)	AUTO indicator lamp of 4WD shift indicator lamp: OFF		Battery voltage
			AUTO indicator lamp of 4WD shift indicator lamp: ON		0V
22	Y/R	Power supply	Ignition switch: ON		Battery voltage
			Ignition switch: OFF		0V
23	R	4WD shift switch (4LO)	Ignition switch: ON	4WD shift switch: 4LO	Battery voltage
				4WD shift switch: 2WD, AUTO or 4H	0V
24	LG/R	4WD shift switch (AUTO)	Ignition switch: ON	4WD shift switch: AUTO	Battery voltage
				4WD shift switch: 2WD, 4H or 4LO	0V
25	V	Neutral-4LO switch	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD, AUTO or 4H	Battery voltage
				4WD shift switch: 4H to 4LO (While actuator motor is operating.)	Battery voltage --> 0V
				4WD shift switch: 4LO to 4H (While actuator motor is operating.)	0V --> Battery voltage
				4WD shift switch: 4LO	0V
27	W/L	Actuator position switch 2 (High)	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4H, AUTO or 2WD	0V
				4WD shift switch: 4LO	Battery voltage
28	B/G	Sensor ground	Always		0V
29	L/W	Ignition switch monitor	Ignition switch: ON		Battery voltage
			Ignition switch: OFF		0V
30	SB	Shut off relay	Ignition switch: ON		0V
			Ignition switch: OFF		Battery voltage
31	G	Transfer fluid temperature sensor	Ignition switch: ON	Transfer fluid temperature approx. 20°C (68°F)	1.1V
				Transfer fluid temperature approx. 80°C (176°F)	0.3V
33	R/L	Transfer shift high relay monitor	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4H to 4LO ("Wait" function is operating.)	Battery voltage
				Except the above	0V
34	BR	Clutch pressure switch	Vehicle stopped Engine running A/T selector lever "D" position	4WD shift switch: AUTO or 4H ("Wait" function is not operating.)	0V
			Vehicle stopped Engine running	4WD shift switch: 2WD ("Wait" function is not operating.)	Battery voltage
35	BR/W	Line pressure switch	Ignition switch: ON A/T selector lever "D" position 4WD shift switch: AUTO		0V
			After the vehicle has been left at room temperature for 5 minutes and more with ignition switch in "OFF" position.	Ignition switch: ON A/T selector lever: "P" or "N" position 4WD shift switch: other than AUTO	Battery voltage
40	L	ATP switch	Vehicle stopped Engine running A/T selector lever "N" Brake pedal depressed	4WD shift switch: 4H to 4LO or 4LO to 4H (While actuator motor is operating.)	0V
				Except the above	Battery voltage
41	R	Transfer motor relay monitor	Accelerator pedal depressed Vehicle stopped Engine running Brake pedal depressed	4WD shift switch: 2WD	0V
				4WD shift switch: AUTO or 4LO (A/T selector lever "P" or "N" position)	0V (Battery voltage for approx. 2 sec. after shifting to "P" and "N".)
				4WD shift switch: AUTO or 4LO (Except for A/T selector lever "P" or "N" position)	Battery voltage
				4WD shift switch: 4H (A/T selector lever "P" position)	0V (Battery voltage for approx. 2 sec. after shifting to "P".)
				4WD shift switch: 4H (Except for A/T selector lever "P" position)	Battery voltage
42	P/G	Transfer shift low relay monitor	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4LO to 4H ("Wait" function is operating.)	Battery voltage
				Except the above	0V
43	G/Y	Wait detection switch	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 2WD, AUTO or 4H	Battery voltage
				4WD shift switch: 4H to 4LO (While actuator motor is operating.)	Battery voltage --> 0V
				4WD shift switch: 4LO to 4H (While actuator motor is operating.)	0V --> Battery voltage
				4WD shift switch: 4LO	0V
44	LG/B	Actuator position switch 1 (Low)	Vehicle stopped Engine running A/T selector lever "N" position Brake pedal depressed	4WD shift switch: 4LO	0V
				4WD shift switch: 2WD, AUTO or 4H	Battery voltage
45	B	Ground	Always		0V
47	W	Power supply (Memory back-up)	Ignition switch: ON		Battery voltage
			Ignition switch: OFF		Battery voltage

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