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Diagnosis Procedure
noteIf all of door motor DTCs are detected, check this circuit.
1.CHECK 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 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 DOOR MOTOR LIN SIGNAL
  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?
INSPECTION END
.
 
4.CHECK DOOR MOTOR LIN SIGNAL CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect A/C amp. and intake door motor 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 DOOR MOTOR LIN SIGNAL CIRCUIT FOR SHORT
  1. Ignition switch OFF.
  2. Disconnect following connectors.
    • Air mix door motor LH
    • Air mix door motor RH
    • Air mix door motor (rear)
    • Mode door motor
  3. Check continuity between A/C amp. harness connector and ground.
    A/C amp.—Continuity
    ConnectorTerminal
    M542GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.
 
6.CHECK DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect intake door motor 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.
 
7.CHECK 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 A/C amp. harness connector and ground.
    A/C amp.—Continuity
    ConnectorTerminal
    M541GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.