Toyota Venza: Blower Motor Circuit

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / 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 / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body / Air Conditioner / Active Test.

(e) Check the operation by referring to the table below.

Air Conditioner

Tester Display	Test Part	Control Range	Diagnostic Note
Blower Motor	Blower motor	Min.: 0, Max.: 31	-

OK:

Blower motor operates and blower motor speed level changes.

Result	Proceed to
OK	A
NG (Blower motor does not operate)	B
NG (Blower motor operates but does not change speed)	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

GO TO STEP 6

2.	CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND)

(a) Disconnect the blower motor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D41-1 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Blower Motor)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D41-3 (+B) - Body ground	Always	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Blower Motor)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - A/C AMPLIFIER)

(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
D47-23 (BLW) - D41-2 (SI)	Always	Below 1 Ω
D47-23 (BLW) - 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 Blower Motor)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT BLOWER MOTOR

(a) Reconnect the blower motor connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D47-23 (BLW) - Body ground	Always	4.5 to 5.5 V

Text in Illustration

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

REPLACE BLOWER MOTOR

6.	INSPECT A/C AMPLIFIER

(a) Remove the A/C amplifier.

(b) Reconnect the A/C amplifier connector.

(d) Turn the blower switch LO.

(e) Measure the waveform between terminal D47-23 (BLW) of the A/C amplifier and body ground.

Item	Content
Tool setting	1 V/DIV., 500 μs/DIV.
Vehicle condition	Ignition switch ON Blower switch LO

Item

Content

Tool setting

1 V/DIV., 500 μs/DIV.

Vehicle condition

Ignition switch ON

Blower switch LO

OK:

Waveform is as shown in the illustration.

HINT:

The waveform varies with the blower speed.

Text in Illustration

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

REPLACE BLOWER MOTOR

REPLACE A/C AMPLIFIER

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