Nissan Murano: Heater & Air Conditioning Control System :: Dtc/circuit Diagnosis / Front Blower Motor

Nissan Murano (Z52) 2015-2024 Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Dtc/circuit Diagnosis / Front Blower Motor

Diagnosis Procedure

CHECK FUSE

  1. Ignition switch OFF.

  2. Check 15A fuses [Nos. 17 and 27, located in fuse block (J/B)].

    NOTE:

    Refer to Terminal Arrangement

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace the blown fuse after repairing the affected circuit.

CHECK FRONT BLOWER MOTOR POWER SUPPLY

  1. Disconnect front blower motor connector.

  2. Ignition switch ON.

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

    + −

    Voltage

    (Approx.)
    Front blower motor
    Connector Terminal
    M112 4 Ground Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 6.

CHECK FRONT BLOWER MOTOR GROUND CIRCUIT

  1. Ignition switch OFF.

  2. Check continuity between front blower motor harness connector and ground.

    Front blower motor — Continuity
    Connector Terminal
    M112 1 Ground Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair harness or connector.

CHECK FRONT BLOWER MOTOR CONTROL SIGNAL CIRCUIT

  1. Disconnect A/C auto amp. connector.

  2. Check continuity between front blower motor harness connector and A/C auto amp. harness connector.

    Front blower motor A/C auto amp. Continuity
    Connector Terminal Connector Terminal
    M112 3 M50 18 Yes

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair the harness or connector.

CHECK FRONT BLOWER MOTOR CONTROL SIGNAL

  1. Reconnect front blower motor connector and A/C auto amp. connector.

  2. Ignition switch ON.

  3. Operate MODE switch to set air outlet to VENT.

  4. Change fan speed from Lo to Hi, and check duty ratios between front blower motor harness connector and ground by using an oscilloscope.

    NOTE:

    Calculate drive signal duty ratio as shown in the figure.

    T2 = Approx. 1.6 ms

    Front blower motor Condition

    Duty ratio

    (Approx.)
    Connector Terminal

    Fan speed (manual)

    VENT mode
    M112 3 1st 25 %
    2nd 31 %
    3rd 37 %
    4th 45 %
    5th 55 %
    6th 65 %
    7th 77 %

Is the inspection result normal?

YES>>

Replace front blower motor. Refer to Removal and Installation.

NO>>

Replace A/C auto amp. Refer to Removal and Installation.

CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT

  1. Ignition switch OFF.

  2. Check continuity between fuse block (J/B) harness connector and ground.

    Fuse block (J/B) — Continuity
    Connector Terminal
    M68 13R Ground Yes

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

Repair harness or connector.

CHECK FRONT BLOWER RELAY

Check front blower motor relay. Refer to Component Inspection (Front Blower Motor Relay).

Is the inspection result normal?

YES>>

Repair harness or connector between front blower motor and fuse block (J/B).

NO>>

Replace front blower relay.

Component Inspection (Front Blower Motor)

CHECK FRONT BLOWER MOTOR

  1. Connect battery voltage to terminal 4 of front blower motor.

  2. Connect ground to terminal 1 of front blower motor.

Does the front blower fan operate?

YES>>

Intermittent incident. Refer to Intermittent Incident.

NO>>

Replace front blower motor. Refer to Removal and Installation.

Component Inspection (Front Blower Motor Relay)

CHECK BLOWER RELAY

  1. Ignition switch OFF.

  2. Disconnect front blower motor relay connector.

  3. Check continuity between front blower motor relay terminals 3 and 5 when 12 V voltage is supplied between terminals 1 and 2.

    Front blower motor relay Voltage Continuity
    Terminals
    3 5 ON Yes
    OFF No

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace front blower motor relay.

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