Toyota Venza: Air Conditioning Control Panel Circuit

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / Air Conditioning Control Panel Circuit

DESCRIPTION

This circuit consists of the air conditioning control assembly and the A/C amplifier. When the air conditioning control assembly is operated, signals are transmitted to the A/C amplifier through the LIN communication system.

If the LIN communication system malfunctions, the A/C amplifier does not operate even if the air conditioning control assembly is operated.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND)

(a) Disconnect the air conditioning control assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E3-5 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Air Conditioning Control Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
E3-4 (IG+) - E3-5 (GND)	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Air Conditioning Control Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - AIR CONDITIONING CONTROL ASSEMBLY)

(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
D47-37 (LIN1) - E3-2 (LIN1)	Always	Below 1 Ω
D47-37 (LIN1) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to A/C Amplifier)

Front view of wire harness connector

(to Air Conditioning Control Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT AIR CONDITIONING CONTROL ASSEMBLY

(a) Replace the air conditioning control assembly (See page ).

HINT:

Since the air conditioning control assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning control assembly with a new or a known good one and check that the condition returns to normal.

(b) Operate the air conditioning control assembly to check that it functions properly.

Result	Proceed to
Air conditioning control assembly malfunctions	A
Air Conditioning control assembly functions properly	B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

Ambient Temperature Sensor Circuit (B1412/12)

DESCRIPTION The ambient temperature sensor is installed in front of the condenser. It detects the ambient temperature to control air conditioning AUTO mode. This sensor is connected to the A/C am ...

Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MGC relay turns on to operate the magnetic clutch. WIRI ...

Other materials about Toyota Venza:

ECM Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area ECM Communication Stop Mode "Engine" and "ECT" are not displayed on "CAN Bus Check" screen of the Techs ...

Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2) (P0037,P0038,P0141,P102D)
DESCRIPTION Refer to DTC P0136 (See page ). HINT: When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is t ...

Short in Driver Side Knee Airbag Squib Circuit (B1860/64-B1863/64)
DESCRIPTION The driver side knee airbag squib circuit consists of the center airbag sensor assembly and driver side knee airbag assembly. The center airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met. These ...