Toyota Venza manuals

Toyota Venza: 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.

(c) Turn the Techstream 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


A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


C

GO TO STEP 6


B

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)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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)



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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

*1

Front view of wire harness connector

(to A/C Amplifier)

*2

Front view of wire harness connector

(to Blower Motor)



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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)



NG

REPLACE BLOWER MOTOR


OK

6.

INSPECT A/C AMPLIFIER

(a) Remove the A/C amplifier.


(b) Reconnect the A/C amplifier connector.

(c) Turn the ignition switch to ON.

(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

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)


OK

REPLACE BLOWER MOTOR


NG

REPLACE A/C AMPLIFIER

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