Blower Motor Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / 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	Min.: 0, Max.: 31	-

   OK

   Blower motor operates and blower motor speed level changes.

NG → See step   10 

OK: Go to next step 

1. Remove the solar ventilation relay.
   Fig 1: Inspecting Solar Ventilation Relay

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

   Standard Resistance

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 4	Below 1 Ω
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
   3 - 4	10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)

NG → REPLACE SOLAR VENTILATION RELAY 

OK: Go to next step 

1. Disconnect the solar ventilation relay connector.
   Fig 2: Inspecting Solar Ventilation ECU Connector

   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
   L104-4 - Body ground	Power switch off Solar ventilation switch off	Below 1 V
   L104-4 - Body ground	Power switch off Solar ventilation switch on (System operation conditions reference table met. Refer to SYSTEM DESCRIPTION )	1 to 28 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Solar Ventilation Relay)

NG → See step   7 

OK: Go to next step 

1. Disconnect the solar ventilation ECU connector.
   Fig 3: Identifying Solar Ventilation ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the blower motor connector.
   Fig 4: Identifying Blower Motor Connector

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L22-5 (BLW) - L33-2 (SI)	Always	Below 1 Ω
   L22-5 (BLW) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Solar Ventilation ECU)
   *2	Front view of wire harness connector (to Blower Motor)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reinstall the solar ventilation relay.
2. Reconnect the solar ventilation relay connector.
3. Reconnect the blower motor connector.
4. Reconnect the solar ventilation ECU connector.
5. Measure the waveform between terminal L22-5 (BLW) of the solar ventilation ECU and body ground.
   Fig 5: Identifying Solar Ventilation ECU Connector & Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Content
   Tool setting	1 V/DIV., 500 μs/DIV.
   Vehicle condition	Power switch off Solar ventilation switch on (blower motor operating)

   OK

   Waveform is as shown in the illustration.

   HINT: 

   The waveform varies with the blower speed.

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Solar Ventilation ECU)

NG → See step   6 

OK → See step   8 

1. Replace the blower motor with a known good one and check if the same problem occurs again. Refer to REMOVAL .

   OK

   Same problem does not occur.

NG → See step   9 

OK → END (BLOWER MOTOR WAS DEFECTIVE) 

1. Disconnect the solar ventilation ECU connector.
   Fig 6: Identifying Solar Ventilation ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 7: Identifying L104 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L22-12 (BLWB) - L104-4	Always	Below 1 Ω
   L22-12 (BLWB) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Solar Ventilation ECU)
   *2	Front view of wire harness connector (to Solar Ventilation Relay)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   9