Front Lifting Switch Circuit Inspection

CHECK FUNCTION
With CONSULT-II

With "LIFT FR SW-UP, LIFT FR SW-DN" on the DATA MONITOR, operate the front lifting switch to check ON/OFF operation.

Fig 1: Front Lifting Switch Operation Chart (With CONSULT-II)
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Function - LIFT FR SW-UP, LIFT FR SW-DN (With CONSULT-II)
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II

Carry out "SWITCH MONITOR" in the on-board diagnosis function, and operate the front lifting switch to check. Refer to "SWITCH MONITOR ".

OK or NG
1. OK: Replace the driver seat control unit.
2. NG: GO TO 2
CHECK FRONT LIFTING SWITCH INPUT/OUTPUT
1. Turn ignition switch OFF.
2. Check voltage between driver seat control unit B143 and ground.
  
  Fig 3: Driver Seat Control Unit Connector Terminals Voltage Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Front Lifting Switch Input/Output
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: System is OK.
2. NG: GO TO 3.
CHECK HARNESS CONTINUITY
1. Disconnect driver seat control unit connector and power seat switch (driver side) connector.
2. Check continuity between driver seat control unit connector B143 terminals 19 (L/R), 25 (OR/B) and driver seat switch connector B144 terminals 19 (L/R), 25 (OR/B).
  1. 19 (L/R) - 19 (L/R): Continuity should exist.
  2. 25 (OR/B) - 25 (OR/B): Continuity should exist.
3. Check continuity between driver seat control unit connector B143 terminals 19 (L/R), 25 (OR/B) and ground
  1. 19 (L/R) - Ground: Continuity should not exist.
  2. 25 (OR/B) - Ground: Continuity should not exist.
  Fig 5: Checking Harness Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 4.
2. NG: Repair or replace harness between driver seat control unit and power seat switch (driver side).
CHECK FRONT END LIFTING SWITCH
Check continuity between driver seat control unit connector B144 terminal 19, 25 and 15.

Fig 6: Driver Seat Control Unit Connector Terminals Continuity Reference Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 7: Checking Front End Lifting Switch
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 5.
2. NG: Replace power seat switch (driver side).
CHECK POWER SEAT SWITCH GROUND CIRCUIT
Check continuity between power seat switch connector B144 terminal 15 (B) and ground.
1. 15 (B) - Ground: Continuity should exist.
Fig 8: Checking Power Seat Switch Ground Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Check the condition of the harness and connector.
2. NG: Repair or replace harness between power seat switch (driver side) and ground.