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:

Removal
REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the LH side and RH side. The following procedure listed below is for the LH side. PROCEDURE 1. REMOVE REAR WHEEL 2. SEPARATE REAR SPEED SENSOR 3. REMOVE REAR AXLE SHAF ...

Monitor Drive Pattern
MONITOR DRIVE PATTERN 1. TEST MONITOR DRIVE PATTERN FOR ECT CAUTION: Perform this drive pattern on a level surface and strictly observe the posted speed limits and traffic laws while driving. HINT: Performing this drive pattern is one method to simulate ...

Installation
INSTALLATION PROCEDURE 1. CLEAN FRONT SIDE FIX WINDOW ASSEMBLY (a) Clean the outer edges of the front side fix window assembly with a non-residue solvent. NOTICE: Do not touch the glass surface after cleaning it. Be c ...