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:

Outer Rear View Mirror Cover
Components COMPONENTS ILLUSTRATION Installation INSTALLATION PROCEDURE 1. INSTALL OUTER MIRROR COVER (a) Engage the 7 claws to install the outer mirror cover. 2. INSTALL OUTER MIRROR R ...

Removal
REMOVAL PROCEDURE 1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ). 2. REMOVE COOL AIR INTAKE DUCT SEAL 3. REMOVE NO. 1 ENGINE CO ...

Lost Communication with ECM / PCM "A" (U0100,U0129)
DESCRIPTION The power steering ECU receives signals from the ECM and the brake actuator assembly (skid control ECU) via the CAN communication system. DTC No. DTC Detection Condition Trouble Area U0100 ...