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Diagnosis Procedure
1.CHECK AIR MIX DOOR MOTOR LH POWER SUPPLY
  1. Ignition switch ON.
  2. Check voltage between air mix door motor LH harness connector and A/C amp. harness connector.
+−Voltage
Air mix door motor LHA/C amp.
ConnectorTerminalConnectorTerminal
M1451M555810.5 – 16 V
Is the inspection result normal?
.
.
 
2.CHECK AIR MIX DOOR MOTOR LH GROUND CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect air mix door motor LH connector and A/C amp. connector.
  3. Check continuity between air mix door motor LH harness connector and A/C amp. harness connector.
    Air mix door motor LHA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1452M5427Existed
Is the inspection result normal?
.
Repair harness or connector.
 
3.CHECK AIR MIX DOOR MOTOR LH LIN SIGNAL CIRCUIT
  1. Connect air mix door motor LH connector and A/C amp. connector.
  2. Ignition switch ON.
  3. Confirm output waveform between air mix door motor LH harness connector and A/C amp. harness connector with oscilloscope.
    +−Output waveform
    Air mix door motor LHA/C amp.
    ConnectorTerminalConnectorTerminal
    M1453M5558
Is the inspection result normal?
Replace air mix door motor LH. 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 LH POWER SUPPLY CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect air mix door motor LH connector and A/C amp. connector.
  3. Check continuity between air mix door motor LH harness connector and A/C amp. harness connector.
    Air mix door motor LHA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1451M541Existed
Is the inspection result normal?
.
Repair harness or connector.
 
5.CHECK AIR MIX DOOR MOTOR LH POWER SUPPLY CIRCUIT FOR SHORT
  1. Disconnect following connectors.
    • Air mix door motor RH
    • Air mix door motor (rear)
    • Intake door motor
    • Mode door motor
  2. Check continuity between air mix door motor LH harness connector and ground.
    Air mix door motor LH—Continuity
    ConnectorTerminal
    M1451GroundNot 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 LH LIN SIGNAL CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Disconnect air mix door motor LH connector and A/C amp. connector.
  3. Check continuity between air mix door motor LH harness connector and A/C amp. harness connector.
    Air mix door motor LHA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1453M542Existed
Is the inspection result normal?
.
Repair harness or connector.
 
7.CHECK AIR MIX DOOR MOTOR LH LIN SIGNAL CIRCUIT FOR SHORT
  1. Disconnect following connectors.
    • Air mix door motor RH
    • Air mix door motor (rear)
    • Intake door motor
    • Mode door motor
  2. Check continuity between air mix door motor LH harness connector and ground.
    Air mix door motor LH—Continuity
    ConnectorTerminal
    M1453GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair harness or connector.