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Rear Window Defogger System does not Operate: Procedure

  1. INSPECT FUSES (DEF, ECU-IG NO. 2, HTR-IG) 
    Fig 1: Identifying DEF, ECU-IG No. 2 And HTR-IG Fuses
    GTY160187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the DEF, ECU-IG NO. 2 and HTR-IG fuses from the main body ECU.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Item Condition Specified Condition
      DEF fuse Always Below 1 Ω
      ECU-IG NO. 2 fuse Always Below 1 Ω
      HTR-IG fuse Always Below 1 Ω
    3. Reinstall the fuses.

    NG → REPLACE FUSES 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE BATTERY POSITIVE) 
    Fig 2: Identifying Rear Window Defogger Wire Connector Terminals
    GTY160197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      L1-1 - Body ground Ignition switch ON
      Rear defogger switch ON      		 11 to 14 V

    NG → See step   4 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE CONNECTOR - BODY GROUND) 
    Fig 3: Identifying L2 Rear Window Defogger Wire Connector Terminals
    GTY160189Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L2 rear window defogger wire connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      L2-1 - Body ground Always Below 1 Ω
    3. Reconnect the rear window defogger wire connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   9 

  4. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER WIRE - MAIN BODY ECU) 
    Fig 4: Identifying L1 Rear Window Defogger Wire Connector Terminals
    GTY160188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 2F main body ECU connector.
    2. Disconnect the L1 rear window defogger wire connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      L1-1 - 2F-2 Always Below 1 Ω
      L1-1 - Body ground Always 10 kΩ or higher
    4. Reconnect the main body ECU connector.
    5. Reconnect the rear window defogger wire connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (REAR WINDOW DEFOGGER SYSTEM POWER SOURCE) 
    1. Disconnect the 2G main body ECU connector.
      Fig 5: Identifying 2G Main Body ECU Connector Terminals
      GTY165570Courtesy 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
      2G-1 - Body ground Ignition switch ON 11 to 14 V
    3. Reconnect the main body ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. INSPECT MAIN BODY ECU (DEF RELAY) 
    Fig 6: Identifying Main Body ECU (DEF Relay) Connector Terminals
    GTY165107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the main body ECU.
    2. Remove the ECU-IG NO. 2 fuse from the main body ECU.
    3. Measure the resistance of the DEF relay.

      Standard resistance

      Tester Connection Condition Specified Condition
      2G-1 - 2F-2 When battery voltage absent 10 kΩ or higher
      2G-1 - 2F-2 When battery voltage applied to terminals 2Q-12 and ECU-IG NO. 2 fuse (DEF relay side) Below 1 Ω
    4. Reinstall the fuse.
    5. Reinstall the main body ECU.

    NG → REPLACE MAIN BODY ECU 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (HEATER CONTROL (REAR DEFOGGER SWITCH) - MAIN BODY ECU) 
    1. Disconnect the C40 heater control connector.
      Fig 7: Identifying C40 Heater Control Connector Terminals
      GTY163400Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 2Q main body ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      C40-2 (RDEF) - 2Q-12 Always Below 1 Ω
      C40-3 (IG+) - 2Q-10 Always Below 1 Ω
      C40-2 (RDEF) - Body ground Always 10 kΩ or higher
      C40-3 (IG+) - Body ground Always 10 kΩ or higher
    4. Reconnect the heater control connector.
    5. Reconnect the main body ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (HEATER CONTROL - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 8: Identifying C40 Heater Control Connector Terminals
      GTY160196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection Condition Specified Condition
      C40-5 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  9. REPAIR OR REPLACE REAR WINDOW DEFOGGER WIRE. Refer to  REPAIR 
  10. REPLACE HEATER CONTROL. Refer to  REMOVAL 
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