Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Ambient Temperature Sensor

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Heating / Air Conditioning / Ambient Temperature Sensor

Components

COMPONENTS

ILLUSTRATION

*1

COOL AIR INTAKE DUCT SEAL

*2

COOLER (AMBIENT TEMP. SENSOR) THERMISTOR

Inspection

INSPECTION

PROCEDURE

1. INSPECT COOLER (AMBIENT TEMP. SENSOR) THERMISTOR

(a) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Tester Connection

Condition

Specified Condition

1 - 2

10°C (50°F)

3.00 to 3.73 kΩ

15°C (59°F)

2.45 to 2.88 kΩ

20°C (68°F)

1.95 to 2.30 kΩ

25°C (77°F)

1.60 to 1.80 kΩ

30°C (86°F)

1.28 to 1.47 kΩ

35°C (95°F)

1.00 to 1.22 kΩ

40°C (104°F)

0.80 to 1.00 kΩ

45°C (113°F)

0.65 to 0.85 kΩ

50°C (122°F)

0.50 to 0.70 kΩ

55°C (131°F)

0.44 to 0.60 kΩ

60°C (140°F)

0.36 to 0.50 kΩ

If the resistance is not as specified, replace the cooler (ambient temp. sensor) thermistor.

NOTICE:

  • Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.
  • When measuring, the sensor temperature must be the same as the ambient temperature.

HINT:

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

*a

Component without harness connected

(Cooler (Ambient Temp. Sensor) Thermistor)

*b

Sensing Portion

*c

Resistance (kΩ)

*d

Temperature (°C (°F))

*e

Allowable Range

Installation

INSTALLATION

PROCEDURE

1. INSTALL COOLER (AMBIENT TEMP. SENSOR) THERMISTOR

(a) Connect the connector.

(b) Engage the clamp to install the cooler (ambient temp. sensor) thermistor.

2. INSTALL COOL AIR INTAKE DUCT SEAL

Click here

Removal

REMOVAL

PROCEDURE

1. REMOVE COOL AIR INTAKE DUCT SEAL

Click here

2. REMOVE COOLER (AMBIENT TEMP. SENSOR) THERMISTOR

(a) Disengage the clamp.

(b) Disconnect the connector to remove the cooler (ambient temp. sensor) thermistor.

    Reassembly
    REASSEMBLY PROCEDURE 1. INSTALL NO. 1 COOLER THERMISTOR Click here 2. INSTALL NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY (a) Install a new No. 1 cooler evaporator sub-assembly with No. 1 cooler thermis ...

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