Blower Motor Circuit: 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 / Air Conditioner / Active Test.
5. Check the operation by referring to the table below.
   AIR CONDITIONER
   
   

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

   Result

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

C → See step   6 

B → See step   2 

A → See step   7 

1. Disconnect the blower motor connector.
   Fig 1: Identifying E23 Connector GND Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E23-1 (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: Go to next step 

1. Disconnect the blower motor connector.
   Fig 2: Identifying E23 Connector +B Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E23-3 (+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: Go to next step 

1. Disconnect the A/C amplifier connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E23-2 (SI) - E30-23 (BLW)	Always	Below 1 Ω
   E23-2 (SI) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the connector to the blower motor.
2. Measure the voltage on the A/C amplifier connector side according to the value(s) in the table below.
   Fig 3: Identifying E30 Connector BLW Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E30-23 (BLW) - Body ground	Ignition switch ON	4.5 to 5.5 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   8 

OK: Go to next step 

1. Remove the A/C amplifier.
2. Reconnect the connector to the A/C amplifier.
   Fig 4: Identifying E30 Connector BLW Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Turn the ignition switch to ON.
   Fig 5: Identifying Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Turn the blower switch on.
5. Measure the waveform between terminal E30-23 (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: ON

   OK

   Waveform is as shown in the illustration.

   HINT: 

   Waveform varies with the blower level.

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   9 

OK → See step   8