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Home › Toyota › 2007 › Highlander Limited, AWD › Repair and Diagnosis › Body & Frame › Windows › Windshield/WINDOWGLASS (Except Hybrid) › Window Defogger System › Rear Window Defogger System does not Operate › Inspection Procedure

Inspection Procedure

  1. INSPECT COMMUNICATION LINE 
    1. Use the intelligent tester to check for normal function of the multiplex communication system.
      1. (ECU unconnected, communication line malfunctioning) Without DTC B1214, B1215 or B 1262 outputs, proceed to A.
      2. (ECU unconnected, communication line malfunctioning) With DTC B1214, B1215 or B 1262 outputs, proceed to B.

    B:  GO TO MULTIPLEX COMMUNICATION SYSTEM

    A: Go to Next Step 

  2. INSPECT FUSE (HEATER, RR-DEF) 
    1. Remove the HEATER fuse from the instrument panel J/B.
    2. Remove the RR-DEF fuse from the FL block.
    3. Check the resistance.

      Standard resistance: Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to Next Step 

  3. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
    1. Connect the intelligent tester (with CAN VIN) to the DLC3.
    2. Turn the ignition switch on.
    3. Perform the ACTIVE TEST according to the display on the tester.

      AIR CONDITIONER: 

      ACTIVE TEST LIST - AIR CONDITIONER

      Item Test Details Diagnostic Note
      DEFOGGER RLY-R Operate rear window defogger OFF/ON -

    NG:  Go to step  5

    OK: Go to Next Step 

  4. CHECK AIR CONDITIONING SYSTEM OPERATE 

    NG:  GO TO AIR CONDITIONING SYSTEM

    OK: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

  5. INSPECT JUNCTION BLOCK 
    Fig 1: Inspecting Junction Block
    G05243941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the voltage of the terminal of the J/B.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Switch Position Specified Condition
      2A-8 - Body Ground Ignition switch ON 10 to 14 V
      2A-8 - Body Ground Ignition switch OFF Below 1 V
      2H-2 - Body Ground Always 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    OK: Go to Next Step 

  6. INSPECT JUNCTION BLOCK (MODE MONITOR TERMINAL) 
    Fig 2: Inspecting Junction Block (Mode Monitor Terminal)
    G05243942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the voltage of the terminal to the following condition.
      • Engine running.
      • A/C switch is OFF.
      • Rear defogger and deicer switch is ON.

        Result 

        RESULT CHART

        Result Proceed to
        More than 5 V A
        Below 2 V B

    B:  Go to step  12

    A: Go to Next Step 

  7. INSPECT JUNCTION BLOCK (RR-DEF RELAY) 
    Fig 3: Inspecting Junction Block (RR-DEF Relay)
    G05243943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the engine room junction block.
    2. Connect the battery positive (+) lead to terminal 2H-2 and battery negative (-) terminal lead to terminal 2A-8, 2C-1 and 2C-3.
    3. Check the voltage of the RR-DEF relay terminals.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      2C-1 - 2A-8 Always Below 1 V
    4. Connect another battery positive (+) lead to the terminal 2A-8.
    5. Check the voltage of the RR-DEF relay terminals.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      2C-1 - 2A-8 Ignition switch ON Below 1 V
      2C-1 - 2A-8 Ignition switch OFF 10 to 14 V

    NG: REPLACE JUNCTION BLOCK 

    OK: Go to Next Step 

  8. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Disconnect the A10 connector.
      Fig 4: Identifying A10 Connector Terminals
      G05243944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester connection Condition Specified condition
      A10-18 (RDFG) -Body ground Ignition switch: ON 10 to 14 V
      A10-18 (RDFG)-Body ground Ignition switch: OFF Below 1 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  9. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Connect the A10 connector.
      Fig 5: Identifying A10 Connector Terminals
      G05243945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the intelligent tester to the DLC3.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester connection Intelligent tester condition Specified condition
      A10-18 (RDFG) - Body ground ACTIVE TEST: ON (*1) 10 to 14 V
      A10-18 (RDFG)-Body ground ACTIVE TEST: OFF (*1) Below 1 V
      HINT:
      *1: Perform the ACTIVE TEST according to the display on the tester.

      AIR CONDITIONER: 

      ACTIVE TEST LIST - AIR CONDITIONER

      Item Test Details Diagnostic Note
      DEFOGGER RLY-R Operate rear window defogger OFF/ON -

    NG: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    OK: Go to Next Step 

  10. INSPECT REAR WINDOW DEFOGGER WIRE 
    NOTE:
    • When cleaning the glass, wipe the glass along the wire using a soft and dry cloth. Take care not to damage the wires.
    • Do not use detergents or glass cleaners that have abrasive ingredients.
    • When measuring voltage, wrap a piece of tin foil around the tip of the negative tester probe and press the foil against the wire with your finger, as shown in the illustration.
      Fig 6: Pressing Foil
      G04967166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the ignition switch on.
    2. Turn the defogger switch ON.
    3. Check the voltage at the center of each defogger wire, as shown in the illustration.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Voltage Criteria
      Approx. 5 V Wire Is not broken
      Approx. 10 or O V Wire is broken

      HINT:

      If there is approximately 10 V, the wire may be broken between the center of the wire and the wire end on the battery side. If there is no voltage, the wire may be broken between the center of the wire and the end on the ground side.

      Fig 7: Checking Voltage At Center Of Each Defogger Wire
      G04967167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Place the voltmeter positive (+) lead against the defogger wire on the battery side.
    5. Place the voltmeter negative (-) lead with the foil strip against the wire on the ground side.
    6. Slide the positive (+) lead from the battery side to the ground side.
    7. The point where the voltage drops from approximately 10 V to 0 V is where the defogger wire is broken.

      HINT:

      If the defogger wire is not broken, the voltmeter indicates 0 V at the positive (+) end of the defogger wire but gradually increases to approximately 12 V as the meter probe moves to the other end.

    NG: REPAIR REAR WINDOW DEFOGGER WIRE 

    Fig 8: Checking Voltage Between Center Of Defogger Wire
    G04833939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  11. CHECK WIRE HARNESS (REAR WINDOW DEFOGGER - ENGINE ROOM JUNCTION BLOCK) 
    1. Disconnect the N2 defogger and 2C J/B connectors.
      Fig 9: Identifying N2 Defogger And 2C J/B Connector Terminals
      G05243949Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      N2-1 -2C-1 Below 1 Ω
      N2-1 - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE NOISE FILTER 

  12. PERFORM ACTIVE TEST BY WIRE HARNESS (REAR WINDOW DEFOGGER - ENGINE ROOM JUNCTION BLOCK) 
    1. Disconnect the N2 defogger and 2C J/B connectors.
      Fig 10: Identifying N2 Defogger And 2C J/B Connector Terminals
      G05243949Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      N2-1 - 2C-1 Below 1 Ω
      N2-1 - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  13. INSPECT JUNCTION BLOCK (RR-DEF RELAY) 
    Fig 11: Inspecting Junction Block (RR-DEF Relay)
    G05243943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the engine room junction block.
    2. Connect the battery positive (+) lead to terminal 2H-2 and battery negative (-) terminal lead to terminal 2A-8, 2C-1 and 2C-3.
    3. Check the voltage of the RR-DEF relay terminals.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      2C-1 - 2A-8 Always Below 1 V
    4. Connect another battery positive (+) lead to the terminal 2A-8.
    5. Check the voltage of the RR-DEF relay terminals.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      2C-1 - 2A-8 Ignition switch ON 10 to 14 V
      2C-1 - 2A-8 Ignition switch OFF Below 1 V

    NG: REPLACE JUNCTION BLOCK 

    OK: REPLACE NOISE FILTER 

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