LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1081 (Manual HVAC System) >> Trouble Diagnosis >> Rear Blower Motor Circuit >> Diagnostic Procedure For Rear Blower Motor >> Inspection Flow

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: Inspecting Rear Blower Motor Work Flow Chart
G00848918Courtesy of NISSAN MOTOR CO., U.S.A.
  1. DIAGNOSTIC PROCEDURE 

    Blower motor rotates normally at each speed.

    OK or NG 

    1. OK: INSPECTION END.
    2. NG :
      1. Does not rotate at any speed, GO TO 2.
      2. Does not rotate at 1 - 3 speed, GO TO  13.
      3. Does not rotate at 4 speed, GO TO  18.
  2. 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.
  3. 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 B134 Terminal + (L/R) And Ground
        G00848919Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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.
  5. 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: Momentarily (No More Than 4 Seconds), Connect A Jumper Wire Between Rear Blower Motor Relay Connector J1 (Harness Side) Terminals 3 And 5
        G00848920Courtesy of NISSAN MOTOR CO., U.S.A.
  6. 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 Voltage Between Fuse Block (J/B) Harness Connector E30 Terminal 3Q (W/G) And Ground
        G00848921Courtesy of NISSAN MOTOR CO., U.S.A.
  7. 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 Continuity Between Fuse Block (J/B) Harness Connector M3 Terminal 7N (B) And Ground
      G00848922Courtesy of NISSAN MOTOR CO., U.S.A.
  8. 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.
  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 Continuity Between Rear Blower Motor Harness Connector B134 Terminal + (L/R) And Ground
        G00848923Courtesy of NISSAN MOTOR CO., U.S.A.
  10. 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 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)
        G00848924Courtesy of NISSAN MOTOR CO., U.S.A.
  11. CHECK REAR BLOWER MOTOR 

    Refer to "REAR BLOWER MOTOR ".

    OK or NG 

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

    Refer to "REAR BLOWER SWITCH (FRONT) ".

    OK or NG 

    1. OK: GO TO  15.
    2. NG: Replace front air control. Refer to "FRONT AIR CONTROL ".
  13. 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. Refer to "Removal and Installation ".
  14. 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: Rear Blower Switch (Front) Connector M52 Terminals 3, 7, And 8 Voltage Specifications
      G00848925Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      1. OK: GO TO  17.
      2. NG: GO TO  16.
        Fig 9: Checking Voltage Between Each Rear Blower Switch (Front) Connector M52 Terminals 3 (LG), 7 (LG/B), And 8 (G), And Ground
        G00848926Courtesy of NISSAN MOTOR CO., U.S.A.
  15. 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 Continuity Between Rear Blower Motor Connector B134 Terminal - (L/B) And Ground
        G00848927Courtesy of NISSAN MOTOR CO., U.S.A.
  16. 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: Rear Blower Switch (Front) Connector M52 Terminals 3, 7, And 8, And Rear Blower Motor Resistor Connector B133 Terminals 1, 4, And 2 Continuity Specifications
      G00848928Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 12: Checking 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)
      G00848929Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      1. OK : INSPECTION END.
      2. NG: Repair harness or connector.
  17. CHECK REAR BLOWER SWITCH (FRONT) CIRCUIT 
    1. Disconnect rear blower resistor and rear blower switch (rear) harness connectors.
    2. Check continuity between rear blower switch (front) connector M52 terminals 3 (LG), 5 (L7B), 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: Checking Continuity Between Rear Blower Switch (Front) Connector M52 Terminals 3, 5, 7, And 8, And Rear Blower Switch (Rear) Connector B141 Terminals 9, 6, 8, And 7 Continuity Specifications
      G00848930Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      1. OK: GO TO 18.
      2. NG: Repair harness or connector.
        Fig 14: Checking Continuity Between Rear Blower Switch (Front) Connector M52 Terminals 3 (LG), 5 (L7B), 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)
        G00848931Courtesy of NISSAN MOTOR CO., U.S.A.
  18. 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).
  19. 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).
  20. 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 M50 Terminal 38 (W/G) And Fuse Block (J/B) Connector E30 Terminal 3Q (W/G)
        G00848932Courtesy of NISSAN MOTOR CO., U.S.A.
scientia non olet · About LEMON Manuals