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Diagnosis Procedure
1.CHECK AIR MIX DOOR MOTOR (REAR) 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 (rear) harness connector and A/C amp. harness connector.
+−Voltage
Air mix door motor (rear)A/C amp.
ConnectorTerminalConnectorTerminal
M1511M555810.5 – 16 V
Is the inspection result normal?
.
.
 
2.CHECK AIR MIX DOOR MOTOR (REAR) GROUND CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (rear) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (rear) harness connector and A/C amp. harness connector.
    Air mix door motor (rear)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1512M5427Existed
Is the inspection result normal?
.
Repair harness or connector.
 
3.CHECK AIR MIX DOOR MOTOR (REAR) LIN SIGNAL CIRCUIT
  1. Connect air mix door motor (rear) 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 (rear) harness connector and A/C amp. harness connector with oscilloscope.
    +−Output waveform
    Air mix door motor (rear)A/C amp.
    ConnectorTerminalConnectorTerminal
    M1513M5558
Is the inspection result normal?
Replace air mix door motor (rear). Refer to Removal and Installation.
.
 
4.CHECK AIR MIX DOOR MOTOR (REAR) POWER SUPPLY CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (rear) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (rear) harness connector and A/C amp. harness connector.
    Air mix door motor (rear)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1511M541Existed
Is the inspection result normal?
.
Repair harness or connector.
 
5.CHECK AIR MIX DOOR MOTOR (REAR) POWER SUPPLY CIRCUIT FOR SHORT
  1. Disconnect following connectors.
    • Air mix door motor (passenger side)
    • Air mix door motor (driver side)
    • Intake door motor
    • Mode door motor
  2. Check continuity between air mix door motor (rear) harness connector and ground.
    Air mix door motor (rear)—Continuity
    ConnectorTerminal
    M1511GroundNot 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 (REAR) LIN SIGNAL CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (rear) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (rear) harness connector and A/C amp. harness connector.
    Air mix door motor (rear)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1513M542Existed
Is the inspection result normal?
.
Repair harness or connector.
 
7.CHECK AIR MIX DOOR MOTOR (REAR) LIN SIGNAL CIRCUIT FOR SHORT
  1. Disconnect following connectors.
    • Air mix door motor (passenger side)
    • Air mix door motor (driver side)
    • Intake door motor
    • Mode door motor
  2. Check continuity between air mix door motor (rear) harness connector and ground.
    Air mix door motor (rear)—Continuity
    ConnectorTerminal
    M1513GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair harness or connector.