Blower Motor Circuit [02/2019 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
5. Perform the Active Test according to the display on the Techstream.

   Body Electrical > Air Conditioner > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Blower Motor	Blower with fan motor sub-assembly	Min.: 0 Max.: 31	-

   Body Electrical > Air Conditioner > Active Test 

   Tester Display
   Blower Motor

   OK

   Blower with fan motor sub-assembly is operated.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  2

1. Disconnect the blower with fan motor sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Rear view of wire harness connector (to Blower with Fan Motor Sub-assembly)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A21-1 (GND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A21-3 (+B) - Body ground	Ignition switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the G46 air conditioning amplifier assembly connector.
2. Disconnect the A21 blower with fan motor sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G46-21 (BLW) - A21-2 (SI)	Always	Below 1 Ω
   G46-21 (BLW) or A21-2 (SI) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the air conditioning amplifier assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   G46-21 (BLW) - Body ground	Always	4.75 to 5.25 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  5

1. Using the oscilloscope, check for the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Blower with Fan Motor Sub-assembly)

   Item	Content
   Terminal No.	A21-2 (SI) - Body ground
   Tool Setting	1 V/DIV., 500 μs./DIV.
   Vehicle Condition	Ignition switch ON Blower switch: LO

   HINT: 

   The waveform varies with the blower speed.

   OK

   Waveform is similar to that shown in the illustration.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY. Refer to  DISASSEMBLY [11/2018 - ] 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [11/2018 - ]