Toyota RAV4 manuals

Toyota RAV4 Service Manual: Room temperature sensor circuit

Toyota RAV4. Room temperature sensor circuit


Description

The room temperature sensor is installed in the instrument panel to detect the room temperature and control the heater and air conditioner auto mode. The resistance of the room temperature sensor changes in accordance with the room temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier applies a voltage (5 v) to the room temperature sensor and reads voltage changes as changes in the resistance of the room temperature sensor.

Toyota RAV4. Room temperature sensor circuit


Wiring diagram

Toyota RAV4. Wiring diagram


Inspection procedure

  1. Read value of intelligent tester (room temp)

  1. Connect the intelligent tester (with can vim) to the dlc3.
  2. Turn the ignition switch on and turn the intelligent tester main switch on.
  3. Select the item below in the data list, and read the value displayed on the intelligent tester.

Toyota RAV4. Read value of intelligent tester (room temp)


Ok: the display is as specified in the normal condition column.

Toyota RAV4. Read value of intelligent tester (room temp)




  1. Inspect cooler thermistor (room temperature sensor)

Toyota RAV4. Inspect cooler thermistor (room temperature sensor)


  1. Remove the room temperature sensor.
  2. Measure the resistance of the sensor.

Standard resistance


Notice:

Hint:

As the temperature increases, the resistance decreases (see the graph).



  1. Check wire harness (room temperature sensor - air conditioning amplifier)

Toyota RAV4. Check wire harness (room temperature sensor - air conditioning amplifier)


  1. Disconnect the e21 sensor connector.
  2. Disconnect the e37 amplifier connector.
  3. Measure the resistance of the wire harness side connectors.

Standard resistance




Replace air conditioning amplifier assembly

Diagnostic trouble code chart (2006/01- )
Hint: When the air conditioning system functions properly, dtc b1400/00 is output. Hint: *1: Dtc b1422/22 (compressor lock sensor circuit) is indicated only for a currently occurring malf ...

Ambient temperature sensor circuit
Description The ambient temperature sensor is installed in the front part of the condenser to detect the ambient temperature and control the air conditioner. The sensor is connected to the c ...

Other materials:

Evap system
Related dtcs If any evap system dtcs are set, the malfunctioning area can be determined using the table below. Notice: If the reference pressure difference between the first and second checks is greater than the specification, all the dtcs relating to the reference pressure (p043e, p ...

Adjusting the position of and opening and closing the air outlets
Front center outlets Direct air flow to the left or right, up or down. Turn the knobs to open or close the vents. Turn the knob to open or close the vent for rear seat occupants. М Direct air flow to the left or right, up or down. Open the vent. Close the vent. ...

Horn relay
On-vehicle inspection Remove engine room no. 1 Relay block cover Inspect integration relay (unit a: horn relay) Using a screwdriver, detach the 2 claws and disconnect the integration relay from the engine room junction block. Hint: Tape the screwdriver tip before use. Mea ...

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