LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 1492 (Automatic Air Conditioner) >> 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 2005 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
G02476662Courtesy of NISSAN MOTOR CO., U.S.A.
  1. DIAGNOSTIC PROCEDURE 

    Blower motor rotates normally at each speed.

    OK or NG

    • OK: Inspection End.
    • 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 "FUSE BLOCK-JUNCTION BOX(J/B) ".

    OK or NG

    • OK: GO TO 3.
    • 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.
    Fig 2: Checking Voltage Between Rear Blower Motor Harness Connector Terminal + & Ground
    G02476663Courtesy of NISSAN MOTOR CO., U.S.A.
    • Battery voltage should exist. 

    OK or NG

    • OK: GO TO  11.
    • NG: GO TO 4.
  4. CHECK REAR BLOWER MOTOR RELAY 

    Refer to "REAR BLOWER MOTOR RELAY ".

    OK or NG

    • OK: GO TO 5.
    • 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 switch 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.
    Fig 3: Momentarily Connecting Jumper Wire Between Rear Blower Motor Relay Connector J1 (Harness Side) Terminals 3 & 5
    G02476664Courtesy of NISSAN MOTOR CO., U.S.A.
    • Rear blower motor should rotate. 

    OK or NG

    • OK: GO TO 6.
    • NG: GO TO  10.
  6. CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY CIRCUIT 
    1. Disconnect fuse block (J/B) harness connector.
    2. Turn ignition switch 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.
    Fig 4: Checking Voltage Between Fuse Block Harness Connector E30 Terminal 3Q & Ground
    G02476665Courtesy of NISSAN MOTOR CO., U.S.A.
    • Battery voltage should exist. 

    OK or NG

    • OK: GO TO 7.
    • NG: GO TO  20.
  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.

    Fig 5: Checking Continuity Between Fuse Block (J/B) Harness Connector M3 Terminal 7N & Ground
    G02476666Courtesy of NISSAN MOTOR CO., U.S.A.
    • Continuity should exist. 

    OK or NG

    • OK: Replace fuse block (J/B).
    • NG: Repair harness or connector.
  8. REPLACE FUSE 

    Refer to "FUSE BLOCK-JUNCTION BOX(J/B) "

    Fuse should not open when rear blower motor is activated.

    OK or NG

    • OK: Inspection End.
    • 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.
    Fig 6: Checking Continuity Between Rear Blower Motor Harness Connector B134 Terminal + & Ground
    G02476667Courtesy of NISSAN MOTOR CO., U.S.A.

    Continuity should not exist 

    OK or NG

    • OK: Check rear blower motor. Refer to "REAR BLOWER MOTOR ".
    • NG: Repair harness or connector.
  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).
    Fig 7: Checking Continuity Between Fuse Block (J/B) Harness Connector M3 Terminals 3N, 8N & Rear Blower Motor Harness Connector B134 Terminal +
    G02476668Courtesy of NISSAN MOTOR CO., U.S.A.
    • Continuity should exist. 

    OK or NG

    • OK: GO TO  20.
    • NG: Repair harness or connector.
  11. CHECK REAR BLOWER MOTOR 

    Refer to "REAR BLOWER MOTOR ".

    OK or NG

  12. CHECK REAR BLOWER SWITCH (FRONT) 

    Refer to "REAR BLOWER SWITCH (FRONT) ".

    OK or NG

  13. CHECK REAR BLOWER MOTOR RESISTOR 

    Refer to "REAR BLOWER MOTOR RESISTOR ".

    OK or NG

  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: Terminal Voltage Chart
      G02476669Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 9: Checking Voltage Between Each Rear Blower Switch (Front) Connector M52 Terminals 3, 7, 8 & Ground
      G02476670Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO  17.
    • NG: GO TO  16.
  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.
      Fig 10: Checking Continuity Between Rear Blower Motor Connector B134 Terminal (-) & Ground
      G02476671Courtesy of NISSAN MOTOR CO., U.S.A.

      Continuity should not exist 

    OK or NG

    • OK: GO TO 16.
    • NG: Repair harness or connector.
  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: Terminal Continuity Chart
      G02476672Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 12: Checking Continuity Between Rear Blower Switch (Front) Connector M52 terminals 3, 7, 8 & Rear Blower Motor Resistor Connector B133 Terminals 1, 4, 2
      G02476673Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: Inspection End.
    • NG: Repair harness or connector.
  17. 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
      G02476674Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 14: Checking Continuity Between Rear Blower Switch (Front) Connector M52 Terminals 3, 5, 7, 8 & Rear Blower Switch (Rear) Connector B141 Terminals 9, 6, 8, 7
      G02476675Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 18.
    • NG: Repair harness or connector.
  18. CHECK REAR BLOWER SWITCH (FRONT) 

    Refer to "REAR BLOWER SWITCH (FRONT) ".

    OK or NG

  19. CHECK REAR BLOWER SWITCH (REAR) 

    Refer to "REAR BLOWER SWITCH (REAR) ".

    OK or NG

    • OK: Inspection End.
    • NG: Replace rear blower switch (rear). Refer to "REAR AIR CONTROL ".
  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).
    Fig 15: Checking Continuity Between Front Air Control Harness Connector Terminal 38 & Fuse Block Connector Terminal 3Q
    G02476676Courtesy of NISSAN MOTOR CO., U.S.A.
    • Continuity should exist. 

    OK or NG

scientia non olet · About LEMON Manuals