Lumber Support Circuit Check

CHECK LUMBER SUPPORT SWITCH
1. Turn ignition switch OFF.
2. Disconnect seat memory switch and lumber support switch connector.
3. Check voltage between seat memory switch and lumber support switch connector B158 terminal 1 and ground.
  1. 1 (R) - Ground: Battery voltage
OK or NG
1. OK : GO TO 2.
2. NG : Repair or replace harness between fuse block (J/B) and seat memory switch and lumber support switch.
Fig 1: Checking Voltage Between Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK LUMBER SUPPORT SWITCH
Lumber support switch operate, check continuity seat memory switch and lumber support switch connector B158 terminal 31, 32 and 1, 16B.

Fig 2: Continuity Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Checking Continuity Between Terminal 31, 32 And 1, 16B
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : GO TO 3.
2. NG : Replace power seat switch.
CHECK LUMBER SUPPORT MOTOR HARNESS
1. Disconnect lumber support motor connector.
2. Check continuity between seat memory switch and lumber support switch connector B158 terminal 31, 32 and lumber support motor connector B172 terminal 31, 32.
  1. 31 (W) - 31 (W) : Continuity should exist.
  2. 32 (L) - 32 (L) : Continuity should exist.
3. Check continuity between seat memory switch and lumber support switch connector B158 terminal 31, 32 and ground.
  1. 31 (W) - Ground : Continuity should not exist.
  2. 32 (L) - Ground : Continuity should not exist.
  Fig 4: Checking Continuity Between Terminal 31, 32 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 4.
2. NG : Repair or replace harness between seat memory switch and lumber support switch and lumber support motor.
CHECK LUMBER SUPPORT SWITCH GROUND CIRCUIT
Check continuity between lumber support switch connector B158 terminal 16B and ground.
1. 16B (B) - Ground : Continuity should exist.
OK or NG
1. OK : Check the condition of the harness and connector.
2. NG : Repair or replace harness between seat memory switch and lumber support switch and ground.
Fig 5: Checking Continuity Between Terminal 16B And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.