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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FUSE (GAUGE, HTR) 
    1. Remove the GAUGE fuse from the main body ECU.
    2. Remove the HTR fuse from the engine room relay block.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Item Specified Condition
      GAUGE fuse Below 1 Ω
      HTR fuse Below 1 Ω
    4. Reinstall the GAUGE fuse.
    5. Reinstall the HTR fuse.

    NG: REPLACE FUSE 

    OK: GO TO NEXT STEP 

  2. INSPECT HTR RELAY 
    1. Remove the HTR relay from the main body ECU.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      3-4 Below 1 Ω
      3-5 10 kΩ or higher
      3-4 10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)
      3-5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
    3. Reinstall the HTR relay.
      4. Fig 1: Inspecting HTR Relay
      G04829540Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HTR RELAY 

    OK: GO TO NEXT STEP 

  3. INSPECT BLOWER MOTOR 
    1. Disconnect the E4 blower motor connector.
    2. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, then check that the blower motor operates smoothly.

      OK: The blower motor operates smoothly. 

    3. Measure the current.

      Standard current 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E4-2 (+B) - E4-1 (GND) 1 to 3A
    4. Reconnect the blower motor connector.
      5. Fig 2: Inspecting Blower Motor
      G04829541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Result 

    RESULT REFERENCE

    Result Proceed to
    OK A
    NG (for Hatchback) B
    NG (for Sedan) C

    B: REPLACE BLOWER MOTOR  (See DISASSEMBLY )

    C: REPLACE BLOWER MOTOR  (See DISASSEMBLY )

    A: GO TO NEXT STEP 

  4. CHECK HARNESS AND CONNECTOR (HTR FUSE - MAIN BODY ECU) 
    1. Disconnect the 4L main body ECU connector.
    2. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      4L-1 - Body ground Always 11 to 14 V
    3. Reconnect the main body ECU connector.
      4. Fig 3: Identifying 4L Main Body ECU Connector Terminals
      G04829542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  5. CHECK MAIN BODY ECU 
    1. Remove the HTR relay from the main body ECU.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      4F-7 - HTR-3 Below 1 Ω
      4E-17-HTR-4 Below 1 Ω
    3. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      HTR-5 - Body ground Always 11 to 14 V
    4. Reinstall the HTR relay.
    5. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      4Q-5 - Body ground Ignition switch ON 11 to 14 V
      6. Fig 4: Identifying HTR Relay Terminals
      G04829543Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE MAIN BODY ECU 

    OK: GO TO NEXT STEP 

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEATER CONTROL (BLOWER SWITCH)) 
    1. Disconnect the E1 heater control (blower switch) connector.
    2. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E1-9(LO)-Body ground Ignition switch ON 11 to 14 V
    3. Reconnect the heater control (blower switch) connector.
      4. Fig 5: Identifying E1 Heater Control (Blower Switch) Connector Terminals
      G04829544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BLOWER MOTOR) 
    1. Disconnect the E4 blower motor connector.
    2. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E4-1 (+B) - Body ground Ignition switch ON 11 to 14 V
    3. Reconnect the blower motor connector.
      4. Fig 6: Identifying E4 Blower Motor Connector Terminals
      G04829545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  8. CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - BLOWER MOTOR) 
    1. Disconnect the E3 blower resistor connector.
    2. Disconnect the E4 blower motor connector.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E3-4 - E4-1 Below 1 Ω
    4. Reconnect the blower resistor connector.
    5. Reconnect the blower motor connector.
      6. Fig 7: Identifying E3 Blower Resistor Connector Terminals
      G04829546Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  9. INSPECT BLOWER RESISTOR 
    1. Remove the blower resistor.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      4-1 3.12 to 3.60Ω
      4-3 1.45 to 1.67Ω
      4-2 0.52 to 0.60Ω
    3. Reinstall the blower resistor.
      4. Fig 8: Identifying E4 Blower Motor Connector Terminals
      G04829547Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    RESULT REFERENCE

    Result Proceed to
    OK A
    NG (for Hatchback) B
    NG (for Sedan) C

    B: REPLACE BLOWER RESISTOR  (See DISASSEMBLY )

    C: REPLACE BLOWER RESISTOR  (See DISASSEMBLY )

    A: GO TO NEXT STEP 

  10. INSPECT HEATER CONTROL (BLOWER SWITCH) 
    1. Remove the heater control (blower switch).
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Switch Position Tester Connection Specified Condition
      0 ALL - 5 (E) 10 kΩ or higher
      1 9 (LO) - 5 (E) Below 1 Ω
      1-2 9(LO)-5(E)-7(M1) Below 1 Ω
      2 9(LO)-5(E)-7(M1) Below 1 Ω
      2-3 9(LO)-5(E)-7(M1)-6 (M2) Below 1 Ω
      3 9 (LO) - 5 (E) - 6 (M2) Below 1 Ω
      3-4 9 (LO) - 5 (E) - 6 (M2) -10 (HI) Below 1 Ω
      4 9(LO)-5(E)-10(HI) Below 1 Ω
    3. Reinstall the heater control (blower switch).
      4. Fig 9: Identifying Heater Control (Blower Switch) Terminals
      G04829548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HEATER CONTROL 

    OK: GO TO NEXT STEP 

  11. CHECK HARNESS AND CONNECTOR (HEATER CONTROL (BLOWER SWITCH) BLOWER RESISTOR) 
    1. Disconnect the E1 heater control (blower switch) connector.
    2. Disconnect the E3 blower resistor connector.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E1-5(E)-E3-1 Below 1 Ω
      E1-6(M2)-E3-2 Below 1 Ω
      E1-7(M1)-E3-3 Below 1 Ω
      E1-10(HI)-E3-4 Below 1 Ω
    4. Reconnect the heater control (blower switch) connector.
    5. Reconnect the blower resistor connector.
      6. Fig 10: Identifying E1 Heater Control (Blower Switch) Connector Terminals
      G04829549Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (BLOWER RESISTOR - BODY GROUND) 

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