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Diagnosis Procedure
1.CHECK AIR MIX DOOR MOTOR (REAR) POWER SUPPLY
  1. Ignition switch 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. Ignition 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. Ignition switch 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 MODE SELECTION DAMPER CONTROL MOTOR, AIR MIXING DAMPER CONTROL MOTOR AND OUTSIDE/INSIDE AIR SELECTION DAMPER CONTROL MOTOR REMOVAL AND INSTALLATION.
.
 
4.CHECK AIR MIX DOOR MOTOR (REAR) POWER SUPPLY CIRCUIT FOR OPEN
  1. Ignition 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 LH
    • Air mix door motor RH
    • 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 A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.
 
6.CHECK AIR MIX DOOR MOTOR (REAR) LIN SIGNAL CIRCUIT FOR OPEN
  1. Ignition 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 LH
    • Air mix door motor RH
    • 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 A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.