Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000025R2B
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (except TMC Made, and Gasoline Model, with Automatic Air Conditioning System): B1451; Compressor Solenoid Circuit; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]

DTC

B1451

Compressor Solenoid Circuit

DESCRIPTION

In this circuit, the compressor assembly with pulley receives refrigerant compression demand signals from the air conditioning amplifier assembly.

Based on this signal, the compressor assembly with pulley 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

  • Compressor assembly with pulley
  • Harness or connector
  • Air conditioning amplifier assembly

-

WIRING DIAGRAM

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (COMPRESSOR ASSEMBLY WITH PULLEY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the I49 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

C85-2 (SOL+) - I49-18 (SOL+)

Always

Below 1 Ω

C85-2 (SOL+) or I49-18 (SOL+) - Other terminals and body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

*a

Front view of wire harness connector

(to Compressor Assembly with Pulley)

(a) Disconnect the C85 compressor assembly with pulley connector.

(b) Check the waveform.

Item

Content

Terminal No.

C85-2 (SOL+) - Body ground

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.

OK

REPLACE COMPRESSOR ASSEMBLY WITH PULLEY

for M20A-FKS: Click here 2019 - 2025 MY Corolla Corolla Hatchback [06/2018 -        ]; HEATING / AIR CONDITIONING: COMPRESSOR (for M20A-FKS): REMOVAL

for 2ZR-FAE: Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; HEATING / AIR CONDITIONING: COMPRESSOR (for 2ZR-FAE): REMOVAL

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY