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