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Home >> Toyota >> 2009 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Cooling System (1AR-FE)) >> Cooling Fan System >> Cooling Fan Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
NOTE: Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ELECTRIC COOLING FAN) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Enter the following menus: Powertrain/Engine/Active Test/Control the Electric Cooling Fan.
    4. Check the operation of the cooling fans while operating it using the Techstream.

      OK 

    TECHSTREAM OPERATION CHART

    Techstream Operation Specified Condition
    ON Cooling fans operated
    OFF Cooling fans stopped

    Result 

    RESULT CHART

    Result Proceed to
    OK A
    NG (Cooling fans do not operate) B
    NG (Cooling fans do not stop) C

    B: Go to step 2 

    C: Go to step  10

    A: PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE  (See SYSTEM DIAGRAM )

  2. INSPECT COOLING FAN MOTOR (COOLING FAN MOTOR AND NO. 2 COOLING FAN MOTOR) 
    1. Disconnect the cooling fan motor and No. 2 cooling fan motor connectors.
    2. Connect a battery positive (+) lead to each terminal 2 of the cooling fan motor and No. 2 cooling fan motor connectors, and connect a battery negative (-) lead to each terminal 1 of the cooling fan motor and No. 2 cooling fan motor connectors.

      OK: 

      The cooling fan motors operate. 

      Result 

      RESULT CHART

      Result Proceed to
      OK A
      NG (Cooling fan motor) B
      NG (No. 2 Cooling fan motor) C
    3. Reconnect the cooling fan motor connectors.

      B: REPLACE COOLING FAN MOTOR  (See ON-VEHICLE INSPECTION )

      C: REPLACE NO. 2 COOLING FAN MOTOR  (See ON-VEHICLE INSPECTION )

    Fig 1: Identifying Cooling Fan Motor Connectors
    G06115362Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU POWER SOURCE) 
    1. Disconnect the cooling fan ECU connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      A9-3 (+B1) - A9-1 (E1) Ignition switch ON 11 to 14 V
    4. Reconnect the cooling fan ECU connector.

      NG: Go to step  5

    Fig 2: Identifying Cooling Fan ECU Connector
    G05415066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (ECM - COOLING FAN ECU) 
    1. Disconnect the ECM connector.
    2. Disconnect the cooling fan ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      D61-10 (RFC) or A9-2 (SI) - Body ground Always 10 kΩ or higher
    4. Reconnect the cooling fan ECU connector.
    5. Reconnect the ECM connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - COOLING FAN ECU) 

    Fig 3: Identifying Cooling Fan ECU Connector And ECM Connector
    G06115364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE COOLING FAN ECU  (See COOLING FAN SYSTEM )

  5. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU - BODY GROUND) 
    1. Disconnect the cooling fan ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A9-1 (E1) - Body ground Always Below 1 Ω
    3. Reconnect the cooling fan ECU connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN ECU - BODY GROUND) 

    Fig 4: Identifying A9 Cooling Fan ECU Connector
    G05415067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  6. INSPECT RELAY (FAN MAIN) 
    1. Remove the FAN MAIN relay from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 5: FAN MAIN Relay Circuit Diagram
      G05750285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 - 5 No battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω
    3. Reinstall the FAN MAIN relay.

      NG: REPLACE RELAY (FAN MAIN RELAY) 

      OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (FAN MAIN RELAY POWER SOURCE) 
    1. Remove the FAN MAIN relay from the engine room relay block.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 (FAN MAIN relay) - Body ground Always 11 to 14 V
    3. Reinstall the FAN MAIN relay.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN MAIN RELAY - BATTERY) 

    Fig 6: Identifying FAN MAIN Relay Location
    G06115367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU - FAN MAIN RELAY) 
    1. Remove the FAN MAIN relay from the engine room relay block.
    2. Disconnect the cooling fan ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A9-3 (+B1) - 5 (FAN MAIN relay) Always Below 1 Ω

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A9-3 (+B1) or 5(FAN MAIN relay) - Body ground Always 10 kΩ or higher
    4. Reconnect the cooling fan ECU connector.
    5. Reinstall the FAN MAIN relay.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN ECU - FAN MAIN RELAY) 

    Fig 7: Identifying FAN MAIN Relay And Cooling Fan ECU Connector
    G06115368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (FAN MAIN RELAY - BODY GROUND) 
    1. Remove the FAN MAIN relay from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      2 (FAN MAIN relay) - Body ground Always Below 1 Ω
    3. Reinstall the FAN MAIN relay.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN MAIN RELAY - BODY GROUND) 

    Fig 8: Identifying FAN MAIN Relay Location
    G06115367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN MAIN RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 

  10. CHECK HARNESS AND CONNECTOR (ECM - COOLING FAN ECU) 
    1. Disconnect the ECM connector.
    2. Disconnect the cooling fan ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      D61-10 (RFC) - A9-2 (SI) Always Below 1 Ω
    4. Reconnect the cooling fan ECU connector.
    5. Reconnect the ECM connector.

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - COOLING FAN ECU) 

    Fig 9: Identifying Cooling Fan ECU Connector And ECM Connector
    G06115364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE COOLING FAN ECU  (See COOLING FAN SYSTEM )

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