Toyota Venza: IG Power Source Circuit

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / IG Power Source Circuit

DESCRIPTION

The main power source is supplied to the A/C amplifier when the ignition switch is ON.

The power source is used for operating the A/C amplifier and servo motor, etc.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

Start the engine before inspection. Check the IG1 relay or battery if the engine does not start.

PROCEDURE

1.	INSPECT A/C AMPLIFIER

(a) Remove the A/C amplifier with its connectors still connected.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D47-1 (IG+) - D47-14 (GND)	Ignition switch off	Below 1 V
D47-1 (IG+) - D47-14 (GND)	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Component with harness connected (A/C Amplifier)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)

(a) Disconnect the A/C amplifier connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D47-1 (IG+) - Body ground	Ignition switch off	Below 1 V
D47-1 (IG+) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to A/C Amplifier)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BODY GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D47-14 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to A/C Amplifier)

REPLACE A/C AMPLIFIER

REPAIR OR REPLACE HARNESS OR CONNECTOR

Blower Motor Circuit

DESCRIPTION The blower motor is operated by signals from the A/C amplifier. Blower motor speed signals are transmitted in accordance with changes in the duty ratio. WIRING DIAGRAM CAUTION / NOT ...

Back-up Power Source Circuit

DESCRIPTION The back-up power source circuit for the A/C amplifier is shown below. Power is supplied even when the ignition switch is turned off. The power is used for diagnostic trouble code mem ...

Other materials about Toyota Venza:

Engine Coolant Temperature Receiver Gauge Malfunction
DESCRIPTION In this circuit, the meter CPU receives engine coolant temperature signals from the ECM using the CAN communication system (CAN No. 1 Bus). The meter CPU displays engine coolant temperature that is calculated based on the data received from th ...

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT COOLER CONDENSER ASSEMBLY (a) If the cooler condenser assembly fins are dirty, clean them with water and dry with compressed air. NOTICE: Do not damage the cooler condenser assembly fins. (b) If any cooler con ...

Installation
INSTALLATION PROCEDURE 1. INSPECT TORQUE CONVERTER ASSEMBLY 2. INSTALL TORQUE CONVERTER ASSEMBLY (a) Engage the splines of the input shaft and turbine runner. (b) Engage the splines o ...