Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Compressor Solenoid Circuit (B1451/51)

DESCRIPTION

In this circuit, the cooler compressor assembly (compressor solenoid) receives a refrigerant compression demand signal from the air conditioning amplifier assembly.

Based on this signal, the cooler compressor assembly (compressor solenoid) changes the amount of compressor output.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1451/51

Compressor Solenoid Circuit

Open or short in compressor solenoid circuit

  • Cooler compressor assembly (compressor solenoid)
  • Harness or connector between air conditioning amplifier assembly and cooler compressor assembly (compressor solenoid)
  • Air conditioning amplifier assembly

-

WIRING DIAGRAM

PROCEDURE

1.

INSPECT COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID)

(a) Disconnect the D17 cooler compressor assembly (compressor solenoid) connector.

*a

Component without harness connected

(Cooler Compressor Assembly (Compressor Solenoid))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (SOL-) - 2 (SOL+)

25°C (77°F)

10.1 to 11.1 Ω

NG

REPLACE COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID)

OK

2.

CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID) - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D17-1 (SOL-) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY (COMPRESSOR SOLENOID) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the J43 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D17-2 (SOL+) - J43-3 (SOL+)

Always

Below 1 Ω

D17-2 (SOL+) or J43-3 (SOL+) - Body ground

Always

10 kΩ or higher

Result

Proceed to

NG

A

OK (When troubleshooting according to the Problem Symptoms Table)

B

OK (When troubleshooting according to the DTC)

C

A

REPAIR OR REPLACE HARNESS OR CONNECTOR

B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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