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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?
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.
.
 
4.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?
.
Repair harness or connector.
 
5.CHECK INTAKE DOOR MOTOR POWER SUPPLY CIRCUIT FOR SHORT
  1. Disconnect following connectors.
    • Air mix door motor LH
    • Air mix door motor RH
    • Air mix door motor (rear)
    • Mode door motor
  2. Check continuity between intake door motor harness connector and ground.
    Intake door motor—Continuity
    ConnectorTerminal
    M1471GroundNot existed
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?
.
Repair harness or connector.
 
7.CHECK INTAKE DOOR MOTOR LIN SIGNAL CIRCUIT FOR SHORT
  1. Disconnect following connectors.
    • Air mix door motor LH
    • Air mix door motor RH
    • Air mix door motor (rear)
    • Mode door motor
  2. Check continuity between intake door motor harness connector and ground.
    Intake door motor—Continuity
    ConnectorTerminal
    M1473GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.