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Diagnosis Procedure
1.Front blower motor control signal check
  1. Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
  2. Check duty ratios between Front blower motor harness connector and ground by using an oscilloscope.
    +−ConditionOutput waveform
    Front blower motor
    ConnectorTerminal
    M1441GroundFront blower motor: OFF10.5 – 16 V
    Front blower motor: 1st speed (manual)
    Front blower motor: 7th speed (manual)
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
 
2.Check front blower motor control signal circuit for short to power supply
  1. Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
  2. Disconnect A/C amp. connector and front blower motor connector.
  3. Check continuity between A/C amp. harness connector and front blower motor harness connector.
    A/C amp.Front blower motor Voltage
    ConnectorTerminalConnectorTerminal
    M5434M1441Not existed
Is the inspection result normal?
Replace front blower motor Refer to Removal and Installation.
Repair harnesses or connector.