Toyota Venza: Compressor Solenoid Circuit (B1451/51)

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / Compressor Solenoid Circuit (B1451/51)

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 (68°F)	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))

REPLACE A/C COMPRESSOR (SOLENOID VALVE)

2.	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))

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	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

Front view of wire harness connector

(to A/C Amplifier)

Front view of wire harness connector

(to A/C Compressor (Solenoid Valve))

REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE A/C AMPLIFIER

Driver Side Solar Sensor Short Circuit (B14A2)

DESCRIPTION The solar sensor is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning AUTO mode. The output voltage from the solar sensor varies i ...

BUS IC Communication Malfunction (B1497/97)

DESCRIPTION The air conditioning harness connects the A/C amplifier and each servo. The A/C amplifier supplies power and sends operation instructions to each servo through the air conditioning ha ...

Other materials about Toyota Venza:

Installation
INSTALLATION PROCEDURE 1. INSTALL REAR BUMPER ASSEMBLY (a) w/ Intuitive Parking Assist System: (1) Connect each connector. (b) Engage the 6 claws and install the rear bumper assembly as shown in the illustration. ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" ...

Precaution
PRECAUTION 1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the terminal is reconnected. System Name ...