Toyota Venza: Compressor Lock Sensor Circuit (B1422/22)

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / Compressor Lock Sensor Circuit (B1422/22)

SYSTEM DESCRIPTION

The ECM sends the engine speed signal to the A/C amplifier via CAN communication.

The A/C amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the A/C amplifier determines that the compressor is locked, and turns the magnetic clutch off.

DTC No.	DTC Detection Condition	Trouble Area
B1422/22	Open or short in compressor lock sensor circuit	A/C compressor (A/C lock sensor) Compressor drive belt Harness or connector between A/C compressor and A/C amplifier A/C amplifier CAN communication system

WIRING DIAGRAM

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Use the Techstream to check if the CAN communication system is functioning normally.

Result	Proceed to
CAN DTC is not output	A
CAN DTC is output	B

GO TO CAN COMMUNICATION SYSTEM

2.	INSPECT A/C COMPRESSOR (A/C LOCK SENSOR)

(a) Disconnect the A/C compressor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B9-1 (SSR+) - B9-2 (SSR-)	20°C (68°F)	160 to 320 Ω

Text in Illustration

*1	Component without harness connected (A/C Compressor)

REPLACE A/C COMPRESSOR (A/C LOCK SENSOR)

3.	CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR)

(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
D47-8 (LOCK) - B9-1 (SSR+)	Always	Below 1 Ω
D47-13 (GND) - B9-2 (SSR-)	Always	Below 1 Ω
D47-8 (LOCK) - Body ground	Always	10 kΩ or higher
D47-13 (GND) - 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)

REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE A/C AMPLIFIER

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