Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000VK19 |
Model Year Start: 2016 |
Model: Sienna |
Prod Date Range: [12/2015 - 08/2016] |
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: Blower Motor Circuit; 2016 MY Sienna [12/2015 - 08/2016] |
DESCRIPTION
The blower motor is operated by signals from the air conditioning 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 Electrical / 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
Result
|
Proceed to
|
OK
|
A
|
NG (Blower motor does not operate)
|
B
|
NG (Blower motor operates but does not change speed)
|
C
|
B
|
|
|
2.
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CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND)
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(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
|
D79-3 (GND) - Body ground
|
Always
|
Below 1 Ω
|
Text in Illustration
*a
|
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
|
D79-1 (+B) - Body ground
|
Always
|
11 to 14 V
|
Text in Illustration
*a
|
Front view of wire harness connector
(to Blower Motor)
|
|
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
4.
|
CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - AIR CONDITIONING AMPLIFIER)
|
(a) Disconnect the air conditioning amplifier connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
D75-23 (BLW) - D79-2 (SI)
|
Always
|
Below 1 Ω
|
D75-23 (BLW) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
(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
|
D75-23 (BLW) - Body ground
|
Always
|
4.5 to 5.5 V
|
Text in Illustration
*a
|
Rear view of wire harness connector
(to Air Conditioning Amplifier)
|
|
|
OK
|
|
|
6.
|
INSPECT AIR CONDITIONING AMPLIFIER
|
(a) Remove the air conditioning amplifier.
|
|
(b) Reconnect the air conditioning amplifier connector.
(c) Turn the ignition switch to ON.
(d) Turn the blower switch LO.
(e) Measure the waveform between terminal D75-23 (BLW) of the air conditioning 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
*a
|
Component with harness connected
(Air Conditioning Amplifier)
|
|