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Diagnosis Procedure
1.CHECK INTAKE DOOR MOTOR POWER SUPPLY
  1. Ignition switch ON.
  2. Check voltage between intake door motor harness connector and A/C amp. harness connector.
+−Voltage
Intake door motorA/C amp.
ConnectorTerminalConnectorTerminal
M1471M555810.5 – 16 V
Is the inspection result normal?
.
.
 
2.CHECK INTAKE DOOR MOTOR GROUND CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect intake door motor connector and A/C amp. connector.
  3. Check continuity between intake door motor harness connector and A/C amp. harness connector.
    Intake door motorA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1472M5427Existed
Is the inspection result normal?
.
Repair harness or connector.
 
3.CHECK INTAKE DOOR MOTOR LIN SIGNAL CIRCUIT
  1. Connect intake door motor connector and A/C amp. connector.
  2. Ignition switch ON.
  3. Confirm output waveform between intake door motor harness connector and A/C amp. harness connector with oscilloscope.
    +−Output waveform
    Intake door motorA/C amp.
    ConnectorTerminalConnectorTerminal
    M1473M5558
Is the inspection result normal?
.
.
 
4.CHECK INSTALLATION OF INTAKE DOOR MOTOR
Check intake door motor is properly installed. Refer to MODE SELECTION DAMPER CONTROL MOTOR, AIR MIXING DAMPER CONTROL MOTOR AND OUTSIDE/INSIDE AIR SELECTION DAMPER CONTROL MOTOR REMOVAL AND INSTALLATION.
Is the inspection result normal?
Replace intake door motor. Refer to MODE SELECTION DAMPER CONTROL MOTOR, AIR MIXING DAMPER CONTROL MOTOR AND OUTSIDE/INSIDE AIR SELECTION DAMPER CONTROL MOTOR REMOVAL AND INSTALLATION.
Repair or replace malfunctioning part.
 
5.CHECK INTAKE DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect intake door motor connector and A/C amp. connector.
  3. Check continuity between intake door motor harness connector and A/C amp. harness connector.
    Intake door motorA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1471M541Existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.
 
6.CHECK INTAKE DOOR MOTOR LIN SIGNAL CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect intake door motor connector and A/C amp. connector.
  3. Check continuity between intake door motor harness connector and A/C amp. harness connector.
    Intake door motorA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1473M542Existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.