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Diagnosis Procedure
1.CHECK AIR MIX DOOR MOTOR (PASSENGER 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 (passenger side) harness connector and A/C amp. harness connector.
+−Voltage
Air mix door motor (passenger side)A/C amp.
ConnectorTerminalConnectorTerminal
M1451M54110.5 – 16 V
Is the inspection result normal?
.
.
 
2.CHECK AIR MIX DOOR MOTOR (PASSENGER SIDE) GROUND CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (passenger side) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (passenger side) harness connector and A/C amp. harness connector.
    Air mix door motor (passenger side)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1452M5427Existed
Is the inspection result normal?
.
Repair harness or connector.
 
3.CHECK AIR MIX DOOR MOTOR (PASSENGER SIDE) LIN SIGNAL CIRCUIT
  1. Connect air mix door motor (passenger 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 (passenger side) harness connector and A/C amp. harness connector with oscilloscope.
    +−Output waveform
    Air mix door motor (passenger side)A/C amp.
    ConnectorTerminalConnectorTerminal
    M1453M542
Is the inspection result normal?
.
.
 
4.CHECK INSTALLATION OF AIR MIX DOOR MOTOR (PASSENGER SIDE)
Check air mix door motor (passenger side) is properly installed. Refer to Removal and Installation.
Is the inspection result normal?
Replace air mix door motor (passenger side). Refer to Removal and Installation.
Repair or replace malfunctioning part.
 
5.CHECK AIR MIX DOOR MOTOR (PASSENGER SIDE) POWER SUPPLY CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (passenger side) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (passenger side) harness connector and A/C amp. harness connector.
    Air mix door motor (passenger side)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1451M541Existed
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair harness or connector.
 
6.CHECK AIR MIX DOOR MOTOR (PASSENGER SIDE) LIN SIGNAL CIRCUIT FOR OPEN
  1. Turn the electric motor switch OFF.
  2. Disconnect air mix door motor (passenger side) connector and A/C amp. connector.
  3. Check continuity between air mix door motor (passenger side) harness connector and A/C amp. harness connector.
    Air mix door motor (passenger side)A/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    M1453M542Existed
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair harness or connector.