Blower Motor Speed Control Circuit Inspection

CHECK BLOWER MOTOR SPEED CONTROL SIGNAL CIRCUIT
Check voltage between climate controlled seat control unit connector and ground.

Fig 1: Climate Controlled Seat Control Unit Connector Terminals Voltage Reference Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Blower Motor Speed Control Signal Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 2.
2. NG: Replace climate controlled seat control unit.
CHECK BLOWER MOTOR HARNESS
1. Turn ignition switch OFF.
2. Disconnect climate controlled seat control unit connector and blower motor connector.
3. Check continuity between climate controlled seat control unit connector B159 (driver side), B359 (passenger side) terminal J13 (R) and blower motor connector B155 (driver side), B355 (passenger side) terminal J13 (R).
  1. J13 (R) - J13 (R): Continuity should exist
4. Check continuity between climate controlled seat control unit connector B159 (driver side), B359 (passenger side) terminal J13 (R) and ground.
  1. J13 (R) - Ground: Continuity should not exist
  Fig 3: Checking Blower Motor Harness
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Blower motor control circuit check is OK.
2. NG: Repair or replace harness.