Inspection Flow

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Rear Blower Motor Inspection Flow Chart

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

DIAGNOSTIC PROCEDURE
Blower motor rotates normally at each speed.

OK or NG
1. OK: INSPECTION END.
2. NG
  - Does not rotate at any speed, GO TO 2.
  - Does not rotate at 1 - 3 speed, GO TO 13.
  - Does not rotate at 4 speed, GO TO 18.
CHECK FUSES
Check 15A fuses [Nos. 10 and 11, located in the fuse block (J/B)]. Refer to "FUSES & CIRCUIT BREAKERS - QUEST ".

OK or NG
1. OK: GO TO 3.
2. NG: GO TO 8.
CHECK REAR BLOWER MOTOR POWER SUPPLY
1. Disconnect rear blower motor harness connector.
2. Select any rear blower speed except OFF.
3. Check voltage between rear blower motor harness connector B134 terminal + (L/R) and ground.
  Battery voltage should exist.
OK or NG
1. OK: GO TO 11.
2. NG: GO TO 4.
  
  Fig 2: Checking Voltage Between Rear Blower Motor Harness Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK REAR BLOWER MOTOR RELAY
Refer to "REAR BLOWER MOTOR RELAY ".

OK or NG
1. OK: GO TO 5.
2. NG: Replace rear blower motor relay.
CHECK REAR BLOWER MOTOR POWER FROM RELAY TO REAR BLOWER MOTOR
1. Reconnect rear blower motor harness connector.
2. Disconnect rear blower motor relay.
3. Turn ignition key ON and select any rear blower speed except OFF.
4. Set rear blower switch (front) to any position except OFF, REAR, or 4 - speed.
5. Momentarily (no more than 4 seconds), connect a jumper wire between rear blower motor relay connector J1 (harness side) terminals 3 and 5.
  Rear blower motor should rotate.
OK or NG
1. OK: GO TO 6.
2. NG: GO TO 10.
  
  Fig 3: Checking Rear Blower Motor Power From Relay To Rear Blower Motor
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY CIRCUIT
1. Disconnect fuse block (J/B) harness connector.
2. Turn ignition key ON.
3. Set rear blower switch (front) to any position except OFF, REAR, or 4 - speed.
4. Check voltage between fuse block (J/B) harness connector E30 terminal 3Q (W/G) and ground.
  Battery voltage should exist.
OK or NG
1. OK: GO TO 7.
2. NG: GO TO 20.
  
  Fig 4: Checking Rear Blower Motor Relay (Coil Side) Power Supply Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT
Check continuity between fuse block (J/B) harness connector M3 terminal 7N (B) and ground.

Continuity should exist.

OK or NG
1. OK: Replace fuse block (J/B).
2. NG: Repair harness or connector.
  
  Fig 5: Checking Rear Blower Motor Relay (Coil Side) Ground Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
REPLACE FUSE
Refer to "FUSES & CIRCUIT BREAKERS - QUEST "

Fuse should not open when rear blower motor is activated.

OK or NG
1. OK: INSPECTION END.
2. NG: GO TO 9.
CHECK REAR BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Disconnect battery cables and rear blower motor harness connector.
2. Check continuity between rear blower motor harness connector B134 terminal + (L/R) and ground.
  Continuity should not exist.
OK or NG
1. OK: Check rear blower motor. Refer to "REAR BLOWER MOTOR ".
2. NG: Repair harness or connector.
  
  Fig 6: Checking Rear Blower Motor Power Supply Circuit For Short
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK REAR BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT
1. Disconnect fuse block (J/B) and rear blower motor harness connectors.
2. Check continuity between fuse block (J/B) harness connector M3 terminal 3N (L/R) and 8N (L/R) and rear blower motor harness connector B134 terminal + (L/R).
  Continuity should exist.
OK or NG
1. OK: GO TO 20.
2. NG: Repair harness or connector.
  
  Fig 7: Checking Rear Blower Motor Relay (Switch Side) Power Supply Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK REAR BLOWER MOTOR
Refer to "REAR BLOWER MOTOR ".

OK or NG
1. OK: GO TO 12.
2. NG: Replace rear blower motor.
CHECK REAR BLOWER SWITCH (FRONT)
Refer to "REAR BLOWER SWITCH (FRONT) ".

OK or NG
1. OK: GO TO 15.
2. NG: Replace rear blower switch (front).
CHECK REAR BLOWER MOTOR RESISTOR
Refer to "REAR BLOWER MOTOR RESISTOR ".

OK or NG
1. OK: GO TO 14.
2. NG: Replace rear blower motor resistor.
CHECK REAR BLOWER SWITCH (FRONT) CIRCUIT
1. Disconnect rear blower switch (front).
2. Reconnect rear blower motor resistor harness connector.
3. Check voltage between each rear blower switch (front) connector M52 terminals 3 (LG), 7 (LG/B), and 8 (G), and ground.
  
  Fig 8: Terminal Voltage Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 9: Checking Rear Blower Switch
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 17.
2. NG: GO TO 16.
CHECK REAR BLOWER MOTOR GROUND CIRCUIT TO REAR BLOWER MOTOR RESISTOR
1. Disconnect rear blower motor and rear blower motor resistor harness connector.
2. Check continuity between rear blower motor connector B134 terminal - (L/B) and rear blower motor resistor harness connector B133 terminal 3 (L/B).
  Continuity should exist.
3. Check continuity between rear blower motor connector B134 terminal - (L/B) and ground.
  Continuity should not exist.
OK or NG
1. OK: GO TO 16.
2. NG: Repair harness or connector.
  
  Fig 10: Checking Rear Blower Motor Ground Circuit To Rear Blower Motor Resistor
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK REAR BLOWER SWITCH (FRONT) CIRCUIT
1. Disconnect rear blower resistor harness connector.
2. Check continuity between rear blower switch (front) connector M52 terminals 3 (LG), 7 (LG/B), and 8 (G), and rear blower motor resistor connector B133 terminals 1 (LG), 4 (LG/B), and 2 (G).
  
  Fig 11: Terminal Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END.
2. NG: Repair harness or connector.
  
  Fig 12: Checking Rear Blower Switch (Front) Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK REAR BLOWER SWITCH (FRONT) CIRCUIT
1. Disconnect rear blower switch (rear) harness connectors.
2. Check continuity between rear blower switch (front) connector M52 terminals 3 (LG), 5 (L/B), 7 (LG/B), and 8 (G), and rear blower switch (rear) connector B141 terminals 9 (LG), 6 (L/B), 8 (LG/B), and 7 (G).
  
  Fig 13: Terminal Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 18.
2. NG: Repair harness or connector.
  
  Fig 14: Checking Rear Blower Switch (Front) Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK REAR BLOWER SWITCH (FRONT)
Refer to "REAR BLOWER SWITCH (FRONT) ".

OK or NG
1. OK: GO TO 19.
2. NG: Replace rear blower switch (front).
CHECK REAR BLOWER SWITCH (REAR)
Refer to "REAR BLOWER SWITCH (REAR) ".

OK or NG
1. OK: INSPECTION END.
2. NG: Replace rear blower switch (rear).
CHECK CIRCUIT BETWEEN FRONT AIR CONTROL AND FUSE BLOCK (J/B) [REAR BLOWER MOTOR RELAY (COIL SIDE) POWER]
1. Disconnect front air control and fuse block (J/B) connectors.
2. Check continuity between front air control harness connector M50 terminal 38 (W/G) and fuse block (J/B) connector E30 terminal 3Q (W/G).
  Continuity should exist.
OK or NG
1. OK: Replace front air control.
2. NG: Repair harness or connector.
  
  Fig 15: Checking Continuity Between Front Air Control Harness Connector And Fuse Block
  Courtesy of NISSAN MOTOR CO., U.S.A.