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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?
.
.
 
4.CHECK INSTALLATION OF MODE DOOR MOTOR
Check mode 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 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.
Repair or replace malfunctioning part.
 
5.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?
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?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.