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Home >> Lexus >> 2007 >> LX 470 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning >> Blower Motor Control Relay >> On-Vehicle Inspection

On-Vehicle Inspection

  1. CHECK BLOWER MOTOR CONTROL RELAY 
    1. Connect the connector to the blower motor control relay and inspect the wire harness side connector from the backside as shown in the illustration.

      Test condition:

      • Turn the ignition switch ON
        Fig 1: Identifying Blower Motor Control Relay Connectors
        G05284275Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard voltage 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connection Condition Specified Condition
        1 - Ground Always Below 1 V
        2 - Ground Blower speed control switch at "LO" position Approx. 3.5 V
        Blower speed control switch at "M1" position Approx. 2.2 V
        3 - Ground Operate blower motor Battery positive voltage
        Blower speed control switch at "OFF" position No voltage
        4 - 5 Blower speed control switch at "LO" position Approx. 3.6 V
        Blower speed control switch at "M2" position Approx. 8.3 V
        Blower speed control switch at "HI" position Approx. 13.0 V

        If the result is not as specified, replace the relay.

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