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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1015 (Power Control System) >> Power Distribution System >> Component Diagnosis >> B2615 Front Blower Motor Relay Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect front blower motor relay.
    3. Check voltage between front blower motor relay harness connector and ground under the following conditions.
    VOLTAGE SPECIFICATION

    Front blower motor relay Ground Condition Voltage (V)
    Terminal
    2 Ground OFF or ACC 0
    ON Battery voltage
    Fig 1: Checking Voltage Between Front Blower Motor Relay Harness Connector And Ground
    G05874208Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO  3

    NO: GO TO 2

  2. CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect BCM harness connector.
    3. Check continuity between front blower motor relay harness connector (A) and BCM harness connector (B).
      CONTINUITY SPECIFICATION

      Front blower motor relay BCM Continuity
      Terminal Connector Terminal
      2 M19 90 Yes
      Fig 2: Checking Continuity Between Front Blower Motor Relay Harness Connector (A) And BCM Harness Connector (B)
      G05874209Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check continuity between front blower motor relay harness connector (A) and ground.
    CONTINUITY SPECIFICATION

    Front blower motor relay Ground Continuity
    Terminal
    2 Ground No

    Is the inspection result normal? 

    YES: GO TO  6

    NO: Repair or replace harness.

  3. CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Check continuity between front blower motor relay harness connector and ground.
    CONTINUITY SPECIFICATION

    Front blower motor relay Ground Continuity
    Terminal
    1 Ground Yes
    Fig 3: Checking Continuity Between Front Blower Motor Relay Harness Connector And Ground
    G05874205Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 4

    NO: Repair front blower motor relay ground circuit.

  4. CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY CIRCUIT-2

    Check voltage between front blower motor relay harness connector and ground.

    VOLTAGE SPECIFICATION

    Front blower motor relay Ground Voltage (V)
    Terminal
    3 Ground Battery voltage
    Fig 4: Checking Voltage Between Front Blower Motor Relay Harness Connector And Ground
    G05874201Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 5

    NO: Repair or replace harness.

  5. CHECK FRONT BLOWER MOTOR RELAY

    Refer to "COMPONENT INSPECTION (FRONT BLOWER MOTOR RELAY) ".

    Is the inspection result normal? 

    YES: GO TO 6

    NO: Replace front blower motor relay.

  6. CHECK INTERMITTENT INCIDENT

Refer to "INTERMITTENT INCIDENT ".

Inspection End.

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