Check Lumber Support Circuit

CHECK LUMBER SUPPORT SWITCH
1. Turn ignition switch OFF.
2. Disconnect front power seat switch (driver side) connector.
3. Check voltage between power seat switch (driver side) connector B144 terminal 16 and ground.
  16 (R) - Ground : Battery voltage.
  
  Fig 1: Identifying Voltage Between Power Seat Switch Connector B144 Terminal 16 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK : GO TO 2.
- NG : Repair or replace harness between fuse block (J/B) and power seat switch (Driver side).

CHECK LUMBER SUPPORT SWITCH

Check continuity power seat switch connector B144 terminal 14, 16 and 3 or 5.

CONNECTORS CONTINUITY REFERENCE

Connector	Terminal		Condition	Continuity
B144	3	16	Lumber support switch forward	Yes
	3	14	Lumber support switch backward
	5	16	Lumber support switch backward
	5	14	Lumber support switch forward

OK or NG

OK : GO TO 3.
NG : The harness and connector is checked, and it is normal, replace power seat switch.

Fig 2: Identifying Continuity Power Seat Switch Connector B144 Terminal 14, 16 And 3 Or 5
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK LUMBER SUPPORT MOTOR HARNESS
1. Disconnect lumber support motor connector.
2. Check continuity between power seat switch connector (driver side) B144 terminal 3, 5 and lumber support motor connector B145 terminal 3, 5.
  3 (GY) - 3 (GY) : Continuity should exist.
  
  5 (W/B) - 5 (W/B) : Continuity should exist.
3. Check continuity between power seat switch connector (driver side) B144 terminal 3, 5 and ground.
  
  Fig 3: Identifying Continuity Between Power Seat Switch Connector B144 Terminal 3, 5 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  3 (GY) - Ground : Continuity should not exist.
  
  5 (W/B) - Ground : Continuity should not exist.
OK or NG
- OK : GO TO 4.
- NG : Repair or replace harness between power seat switch (driver side) and lumber support motor.
CHECK LUMBER SUPPORT SWITCH
Check continuity between power seat switch connector (driver side) B144 terminal 14 and ground.

14 (B/W) - Ground : Continuity should exist.

Fig 4: Identifying Continuity Between Power Seat Switch Connector B144 Terminal 14 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK : Check harness and connector.
- NG : Repair or replace harness between power seat switch (driver side) and ground.