1.CHECK BATTERY VOLTAGE OF AIR MIX DOOR MOTOR (PASSENGER SIDE)

1. Turn the ignition switch ON.
2. Check voltage between the air mix door motor (passenger side) harness connector and ground.

(+) | (−) | Voltage (Approx.)
Air mix door motor (passenger side) | —
Connector | Terminal
M255 | 1 | Ground | 12V

Is the inspection result normal?
YES>>GO TO 2.
NO>>Repair the harnesses or connectors.
2.CHECK SIGNAL OF AIR MIX DOOR MOTOR (PASSENGER SIDE)
Check output waveform between the air mix door motor (passenger side) harness connector and ground with the oscilloscope.

(+) | (−) | Output waveform
Air mix door motor (passenger side) | —
Connector | Terminal
M255 | 3 | Ground |

Is the inspection result normal?
YES>>GO TO 3.
NO>>Repair the harnesses or connectors.
3.CHECK GROUND CIRCUIT OF AIR MIX DOOR MOTOR (PASSENGER SIDE)

1. Turn the ignition switch OFF.
2. Disconnect the air mix door motor (passenger side) connector.
3. Check for continuity between the air mix door motor (passenger side) harness connector and ground.

   Air mix door motor (passenger side) | — | Continuity
   Connector | Terminal
   M255 | 2 | Ground | Existed

Is the inspection result normal?
YES>>Replace the air mix door motor (passenger side).
NO>>Repair the harnesses or connectors.