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Diagnosis Procedure
1.CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) POWER SUPPLY
  1. Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
  2. Check voltage between air mix door motor (driver side) harness connector and A/C amp. harness connector.
+−Voltage
Air mix door motor (driver side)A/C amp.
ConnectorTerminalConnectorTerminal
M1401M555810.5 – 16 V
Is the inspection result normal?
.
.
 
2.CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) GROUND CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (driver side) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (driver side) harness connector and A/C amp. harness connector.
    Air mix door motor (driver side)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1402M5427Existed
Is the inspection result normal?
.
Repair harness or connector.
 
3.CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) LIN SIGNAL CIRCUIT
  1. Connect air mix door motor (driver side) connector and A/C amp. connector.
  2. Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
  3. Confirm output waveform between air mix door motor (driver side) harness connector and A/C amp. harness connector with oscilloscope.
    +−Output waveform
    Air mix door motor (driver side)A/C amp.
    ConnectorTerminalConnectorTerminal
    M1403M5558
Is the inspection result normal?
Replace air mix door motor (driver side). Refer to Removal and Installation.
.
 
4.CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) POWER SUPPLY CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (driver side) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (driver side) harness connector and A/C amp. harness connector.
    Air mix door motor (driver side)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1401M541Existed
Is the inspection result normal?
.
Repair harness or connector.
 
5.CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) POWER SUPPLY CIRCUIT FOR SHORT
  1. Disconnect following connectors.
    • Air mix door motor (passenger side)
    • Air mix door motor (rear)
    • Intake door motor
    • Mode door motor
  2. Check continuity between air mix door motor (driver side) harness connector and ground.
    Air mix door motor (driver side)—Continuity
    ConnectorTerminal
    M1401GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair harness or connector.
 
6.CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) LIN SIGNAL CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (driver side) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (driver side) harness connector and A/C amp. harness connector.
    Air mix door motor (driver side)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1403M542Existed
Is the inspection result normal?
.
Repair harness or connector.
 
7.CHECK AIR MIX DOOR MOTOR (DRIVER SIDE) LIN SIGNAL CIRCUIT FOR SHORT
  1. Disconnect following connectors.
    • Air mix door motor (passenger side)
    • Air mix door motor (rear)
    • Intake door motor
    • Mode door motor
  2. Check continuity between air mix door motor (driver side) harness connector and ground.
    Air mix door motor (driver side)—Continuity
    ConnectorTerminal
    M1403GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair harness or connector.