Check Blower Motor Speed Control Circuit

CHECK BLOWER MOTOR SPEED CONTROL SIGNAL CIRCUIT

Check voltage between climate controlled seat control unit connector and ground.

CONNECTORS VOLTAGE REFERENCE

Connector	Terminal (Wire color)		Condition	Voltage (V) (Approx)
Connector	(+)	(-)	Condition	Voltage (V) (Approx)
B159 (Driver side) B359 (Passenger side)	J13 (R)	Ground	Turn ignition switch ON Climate controlled seat switch "HEAT" or "COOL"	4.5 - 9.5
B159 (Driver side) B359 (Passenger side)	J13 (R)	Ground	Turn ignition switch OFF	0

Fig 1: Identifying Voltage Between Climate Controlled Seat Control Unit Connector And Ground

G04130375

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

OK or NG

OK : GO TO 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 and blower motor connector B155 (driver side), B355 (passenger side) terminal J13.
  J13 (R) - J13 (R) : Continuity should exist
  
  Fig 2: Identifying Continuity Between Climate Controlled Seat Control Unit Connector B159, B359 Terminal J13 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between climate controlled seat control unit connector B159 (driver side), B359 (passenger side) terminal J13 and ground.
  J13 (R) - Ground : Continuity should not exist
OK or NG
- OK : Blower motor control circuit check is OK.
- NG : Repair or replace harness.