Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: On-vehicle Inspection

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning Pressure Sensor / On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AIR CONDITIONER PRESSURE SENSOR

(a) Check the wire harness.

(1) Disconnect the A9 air conditioner pressure sensor connector.

(2) Disconnect the J42 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A9-1 (-) - J42-3 (SG-4)	Always	Below 1 Ω
A9-2 (PR) - J42-24 (PRE)	Always	Below 1 Ω
A9-3 (+) - J42-6 (S5-3)	Always	Below 1 Ω
A9-1 (-) - Body ground	Always	10 kΩ or higher
A9-2 (PR) - Body ground	Always	10 kΩ or higher
A9-3 (+) - Body ground	Always	10 kΩ or higher

If the resistance is not as specified, repair the wire harness.

(4) Reconnect the J42 air conditioning amplifier assembly connector.

(5) Turn the engine switch on (IG).

(6) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A9-3 (+) - Body ground	Engine switch on (IG)	4.75 to 5.25 V

If the voltage is not as specified, repair the wire harness or replace air conditioning amplifier assembly.

(b) Check the air conditioner pressure sensor.

(1) Connect the connector to the air conditioner pressure sensor.

(2) Install a manifold gauge set.

(3) Warm up the engine.

(4) Turn the A/C switch on.

(5) Measure the voltage according to the value(s) in the table below.

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

Standard Voltage:

Tester Connection	Condition	Specified Condition
J42-24 (PRE) - J42-3 (SG-4)	Refrigerant pressure: Normal pressure (less than 3025 kPa (30.8 kgf/cm2, 439 psi) and more than 176 kPa (1.8 kgf/cm2, 26 psi))	0.74 to 4.61 V

If the voltage is not as specified, replace the air conditioner pressure sensor.

*a	Component with harness connected (Air Conditioning Amplifier Assembly)

Components

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Removal

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Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: On-vehicle Inspection

Components

Removal

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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual