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Diagnosis Procedure
1.CHECK MODE DOOR MOTOR POWER SUPPLY
  1. Ignition switch ON.
  2. Check voltage between mode door motor harness connector and A/C amp. harness connector.
+−Voltage
Mode door motorA/C amp.
ConnectorTerminalConnectorTerminal
M1431M555810.5 – 16 V
Is the inspection result normal?
.
.
 
2.CHECK MODE DOOR MOTOR GROUND CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect mode door motor connector and A/C amp. connector.
  3. Check continuity between mode door motor harness connector and A/C amp. harness connector.
    Mode door motorA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1432M5427Existed
Is the inspection result normal?
.
Repair harness or connector.
 
3.CHECK MODE DOOR MOTOR LIN SIGNAL CIRCUIT
  1. Connect mode door motor connector and A/C amp. connector.
  2. Ignition switch ON.
  3. Confirm output waveform between mode door motor harness connector and A/C amp. harness connector with oscilloscope.
    +−Output waveform
    Mode door motorA/C amp.
    ConnectorTerminalConnectorTerminal
    M1433M5558
Is the inspection result normal?
Replace mode 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 MODE DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect mode door motor connector and A/C amp. connector.
  3. Check continuity between mode door motor harness connector and A/C amp. harness connector.
    Mode door motorA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1431M541Existed
Is the inspection result normal?
.
Repair harness or connector.
 
5.CHECK MODE 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)
    • Intake door motor
  2. Check continuity between mode door motor harness connector and ground.
    Mode door motor—Continuity
    ConnectorTerminal
    M1431GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.
 
6.CHECK MODE DOOR MOTOR LIN SIGNAL CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect mode door motor connector and A/C amp. connector.
  3. Check continuity between mode door motor harness connector and A/C amp. harness connector.
    Mode door motorA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1433M542Existed
Is the inspection result normal?
.
Repair harness or connector.
 
7.CHECK MODE 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)
    • Intake door motor
  2. Check continuity between mode door motor harness connector and ground.
    Mode door motor—Continuity
    ConnectorTerminal
    M1433GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.