Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Compressor Solenoid Circuit (B1451)

DESCRIPTION

The cooler compressor assembly receives refrigerant compression demand signals from the air conditioning amplifier assembly.

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1451	Compressor Solenoid Circuit	Open or short in compressor solenoid circuit	Cooler compressor assembly Harness or connector Air conditioning amplifier assembly	-

WIRING DIAGRAM

PROCEDURE

1.	INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

*a	Front view of wire harness connector (to Cooler Compressor Assembly)

(a) Disconnect the C59 cooler compressor assembly connector.

(b) Connect an oscilloscope to terminal C59-2 (SOL+) and body ground and check the waveform.

Item	Content
Tool Setting	5 V/DIV., 500 μs./DIV.
Condition	Engine running Blower switch: LO A/C switch: On

OK:

Waveform is similar to that shown in the illustration.

REPLACE COOLER COMPRESSOR ASSEMBLY

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

(a) Disconnect the G35 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
C59-2 (SOL+) - G35-3 (SOL+)	Always	Below 1 Ω
C59-2 (SOL+) or G35-3 (SOL+) - Other terminals and body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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Toyota Avalon (XX50) 2019-2022 Owners Manual