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 | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | |
GO TO STEP 6 |
|
.gif)
|
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 |
|
*1 |
Front view of wire harness connector (to Blower Motor) |
| NG | |
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:
|
|
| NG | |
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:
|
|
| NG | |
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:
|
|
| NG | |
REPLACE BLOWER MOTOR |
|
|
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 |
Air Conditioning Compressor Magnetic Clutch Circuit
DESCRIPTION
When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from
the MGC terminal of the A/C amplifier. Then, the MGC relay turns on to operate the
magnetic clutch.
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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
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PROCEDURE
1.
CHECK HARNESS AND CONN ...
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