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:

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE MAGNETIC CLUTCH ASSEMBLY (a) Place the compressor and magnetic clutch in a vise. (b) Using SST, hold the magnetic clutch hub. SST: 09985-00270 (c) Remove the bolt, ...

Radio Broadcast cannot be Received or Poor Reception
PROCEDURE 1. CHECK NAVIGATION RECEIVER ASSEMBLY (a) Check the radio automatic station search function. (1) Check the radio automatic station search function by activating it. Result Proceed to ...

Ignition Hold Monitor Malfunction (B2271)
DESCRIPTION This DTC is stored when a problem such as an open in the AM2 fuse, an open or short in the wire harness between the fuse and power management control ECU, a short in the IG output circuit inside the power management control ECU, a short betwee ...