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Home >> Toyota >> 2011 >> Matrix Base, Automatic >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System (Diagnostic Codes (B1412 - B1499) & Circuit Tests) >> Air Conditioning System >> Circuit Tests >> Blower Motor Circuit >> Procedure

Blower Motor Circuit: Procedure

  1. INSPECT RELAY (HTR) 
    1. Remove the HTR relay from the instrument panel junction block.
      Fig 1: Identifying Rear Heater Relay Connector Terminals
      GTY206217Courtesy 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 - 4 Below 1 Ω
      3 - 4 10 kΩ or higher (When battery voltage is applied to terminals 1 and 2)
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (When battery voltage is applied to terminals 1 and 2)

    NG → REPLACE RELAY (HTR) 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) 
    1. Disconnect the connector from the A/C amplifier.
      Fig 2: Checking Harness And E8 & E73 Connectors (A/C Amplifier - Battery)
      GTY293046Courtesy 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
      E8-9 (SBLW) - Body ground*1 Ignition switch: ON
      Blower switch: OFF      		 11 to 14 V
      E8-9 (SBLW) - Body ground*1 Ignition switch: ON
      Blower switch: ON      		 Below 1 V
      E73-21 (SBLW) - Body ground*2 Ignition switch: ON
      Blower switch: OFF      		 11 to 14 V
      E73-21 (SBLW) - Body ground*2 Ignition switch: ON
      Blower switch: ON      		 Below 1 V
      • *1: for 2AZ-FE
      • *2: for 2ZR-FE
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to A/C Amplifier (for 2AZ-FE))
      *b Front view of wire harness connector
      (to A/C Amplifier (for 2ZR-FE))

    NG → See step   3 

    OK → See step   11 

  3. INSPECT BLOWER MOTOR 
    1. Remove the blower motor.
    2. Disconnect the connector from the blower motor.
      Fig 3: Inspecting Blower Motor
      GTY292902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect a positive (+) lead from the battery to terminal 2 and a negative (-) lead from the battery to terminal 1, and check that the motor operates.

      OK

      The blower motor operates smoothly.

      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Blower Motor)

    NG → See step   12 

    OK: Go to next step 

  4. INSPECT BLOWER RESISTOR 
    1. Remove the blower resistor.
    2. Disconnect the connector from the blower resistor.
      Fig 4: Inspecting Blower Resistor E75 Connector Terminals
      GTY292025Courtesy 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
      E21-1 (HI) - E21-4 (E) Always 3.12 to 3.60 Ω
      E21-1 (HI) - E21-2 (M1) Always 1.45 to 1.67 Ω
      E21-1 (HI) - E21-3 (M2) Always 0.52 to 0.60 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Blower Resistor)

    NG → See step   13 

    OK: Go to next step 

  5. INSPECT NO. 2 HEATER CONTROL (BLOWER SWITCH) 
    1. Remove the No. 2 heater control (blower switch).
    2. Disconnect the connector from the No. 2 heater control (blower switch).
      Fig 5: Inspecting No. 2 Heater Control (Blower Switch) E75 Connector Terminals
      GTY293714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      E75-4 (LO), E75-6 (HI), E75-9 (M1), E75-10 (M2) - E75-5 (E) Blower switch: OFF 10 kΩ or higher
      E75-4 (LO) - E75-5 (E) Blower switch: LO Below 1 Ω
      E75-4 (LO), E75-9 (M1) - E75-5 (E) Blower switch: M1 Below 1 Ω
      E75-4 (LO), E75-10 (M2) - E75-5 (E) Blower switch: M2 Below 1 Ω
      E75-4 (LO), E75-6 (HI) - E75-5 (E) Blower switch: HI Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (No. 2 Heater Control (Blower Switch))

    NG → See step   14 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 6: Checking Harness And E8 & E73 Connectors (A/C Amplifier - Battery)
      GTY293045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      E8-9 (SBLW) - Body ground*1 Ignition switch: ON 11 to 14 V
      E8-9 (SBLW) - Body ground*1 Ignition switch: OFF Below 1 V
      E73-21 (SBLW) - Body ground*2 Ignition switch: ON 11 to 14 V
      E73-21 (SBLW) - Body ground*2 Ignition switch: OFF Below 1 V
      • *1: for 2AZ-FE
      • *2: for 2ZR-FE
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to A/C Amplifier (for 2AZ-FE))
      *b Front view of wire harness connector
      (to A/C Amplifier (for 2ZR-FE))

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL (BLOWER SWITCH) - BATTERY) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 7: Checking Harness And E75 Connector (No. 2 Heater Control (Blower Switch) - Battery)
      GTY292913Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      E75-4 (LO) - Body ground Ignition switch: ON 11 to 14 V
      E75-4 (LO) - Body ground Ignition switch: OFF Below 1 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to No. 2 Heater Control (Blower Switch))

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - NO. 2 HEATER CONTROL (BLOWER SWITCH)) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E21-1 (HI) - E75-6 (HI) Always Below 1 Ω
      E21-3 (M2) - E75-10 (M2) Always Below 1 Ω
      E21-2 (M1) - E75-9 (M1) Always Below 1 Ω
      E21-4 (E) - Body ground Always Below 1 Ω
      E75-5 (E) - Body ground Always Below 1 Ω
      E21-1 (HI) - Body ground Always 10 kΩ or higher
      E21-3 (M2) - Body ground Always 10 kΩ or higher
      E21-2 (M1) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BLOWER RESISTOR, NO. 2 HEATER CONTROL) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E19-1 - E21-1 (HI) Always Below 1 Ω
      E19-1 - E75-6 (HI) Always Below 1 Ω
      E19-1 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY, BODY GROUND) 
    1. Reconnect the connector to the A/C amplifier.
    2. Reconnect the connector to the blower resistor.
    3. Reconnect the connector to the No. 2 heater control (blower switch).
    4. Measure the voltage according to the value(s) in the table below.
      Fig 8: Identifying E19 Connector Terminals
      GTY290496Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      E19-2 - Body ground Ignition switch: ON
      Blower switch: OFF      		 Below 1 V
      E19-2 - Body ground Ignition switch: ON
      Blower switch: ON      		 11 to 14 V
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      E19-2 - Body ground Ignition switch: OFF
      Blower switch: OFF      		 Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Blower Motor)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   15 

  11. PROCEED TO NEXT SUSPECTED AREA SHOWN IN  PROBLEM SYMPTOMS TABLE 
  12. REPLACE BLOWER MOTOR. Refer to  REMOVAL 
  13. REPLACE BLOWER RESISTOR. Refer to  REMOVAL 
  14. REPLACE NO. 2 HEATER CONTROL (BLOWER SWITCH). Refer to  DISASSEMBLY - Step 2 
  15. REPLACE AIR CONDITIONING AMPLIFIER. Refer to  REMOVAL 
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