Toyota Venza Quiz
Heating / Air Conditioning

Compressor Solenoid Circuit (B1451/51)

In this manual: Heating / Air Conditioning
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~2min read
DESCRIPTION

In this circuit, the A/C compressor receives a refrigerant compression demand signal from the A/C amplifier.

Based on this signal, the A/C compressor changes the amount of compressor output.

DTC No.

DTC Detection Condition

Trouble Area

B1451/51

Open or short in A/C compressor solenoid circuit
  • A/C compressor (solenoid valve)
  • Harness or connector between A/C amplifier and A/C compressor (solenoid valve)
  • A/C amplifier
WIRING DIAGRAM
PROCEDURE

  1. INSPECT A/C COMPRESSOR (SOLENOID VALVE)

(a) Disconnect the A/C compressor (solenoid valve) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B29-2 (SOL+) - B29-1 (SOL-)

20 °C

10 to 11 Ω

Result

Proceed to

OK

A

NG (for 2GR-FE)

B

NG (for 1AR-FE)

C
Text in Illustration

*1

Component without harness connected

(A/C Compressor (Solenoid Valve))

B

REPLACE A/C COMPRESSOR (SOLENOID VALVE)

C

REPLACE A/C COMPRESSOR (SOLENOID VALVE)
A

  1. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR (SOLENOID VALVE) - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B29-1 (SOL-) - Body ground

Always

Below 1 Ω
Text in Illustration

*1

Front view of wire harness connector

(to A/C Compressor (Solenoid Valve))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

  1. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR (SOLENOID VALVE) - A/C AMPLIFIER)

(a) Disconnect the A/C amplifier connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D47-2 (SOL+) - B29-2 (SOL+)

Always

Below 1 Ω

D47-2 (SOL+) - Body ground

Always

10 kΩ or higher

Result:

Result

Proceed to

NG

A

OK (When troubleshooting according to Problem Symptoms Table)

B

OK (When troubleshooting according to the DTC)

C
Text in Illustration

*1

Front view of wire harness connector

(to A/C Amplifier)

*2

Front view of wire harness connector

(to A/C Compressor (Solenoid Valve))

A

REPAIR OR REPLACE HARNESS OR CONNECTOR

B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

REPLACE A/C AMPLIFIER

Test yourself

A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.