B2578, B2579 IN-VEHICLE SENSOR

• The in-vehicle sensor (1) is installed to the instrument lower panel (driver).
  
  
• The in-vehicle sensor converts the interior air temperature of the passenger room sucked by the aspirator detected with the thermistor into the voltage, and the A/C auto amp. inputs this voltage.

The aspirator (1) generates the vacuum by the air blown from the heater and cooling unit and draws the air of the passenger room to the in-vehicle sensor area via the aspirator duct.

: Vehicle front

• The A/C auto amp. inputs the temperature detected with the in-vehicle sensor as the interior air temperature.
• Perform the correction of the temperature detected with the in-vehicle sensor for each air conditioner control.

DTC	Items (CONSULT-III screen terms)	Diagnostic item is detected when...	Possible causes
B2578	IN CAR SENSOR (OUT OF RANGE [LOW])	The in-vehicle sensor recognition temperature is too high.	In-vehicle sensor A/C auto amp. Harness and connector (Short in the in-vehicle sensor circuit)
B2579	IN CAR SENSOR (OUT OF RANGE [HI])	The in-vehicle sensor recognition temperature is too low.	In-vehicle sensor A/C auto amp. Harness and connector (Open in the in-vehicle sensor circuit)