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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 84 (Smart Key System (Keyless Start) - Symptom Tests (Hybrid)) >> SMART KEY SYSTEM (for Start Function, HV Model) >> Symptom Tests >> Power Source Mode does not Change to ON (IG) [04/2018 -] >> Procedure

Power Source Mode does not Change to ON (IG) [04/2018 -]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR DTC 
    1. Using the Techstream, check for certification ECU (smart key ECU assembly) DTCs.

      Body Electrical > Power Source Control > Trouble Codes 

      Body Electrical > Smart Key > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      Smart key system (for Start Function, HV Model) DTCs are output B

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2018 - 08/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 08/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2021 -] 

    Result: 

    A 

    See step  2

  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY933792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))

      Standard Voltage

      Tester Connection Condition Specified Condition
      G40-17 (IG1D) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 9 V or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY, AUXILIARY BATTERY AND BODY GROUND) 
    1. Disconnect the G40 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the 4A, 4D, 4L and 4K instrument panel junction block assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G40-17 (IG1D) - 4A-17 Always Below 1 Ω
      4D-3 - Body ground Always Below 1 Ω
      G40-17 (IG1D) or 4A-17 - Other terminals and body ground Always 10 kΩ or higher
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      4L-1 - Body ground Power switch off 11 to 14 V
      4K-1 - Body ground Power switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1-NO. 1, IG1-NO. 2, IG2-NO. 2 RELAY) 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [04/2018 - 08/2021] , or refer to REMOVAL [08/2021 -]

    2. Connect all of the instrument panel junction block assembly connectors.
    3. Connect the G40 certification ECU (smart key ECU assembly) connector.
    4. Measure the voltage according to the value(s) in the table below.
      GTY897937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      4F-14 - Body ground Power switch on (IG) 11 to 14 V
      4F-2 - Body ground Power switch on (IG) 11 to 14 V
      4F-15 - Body ground Power switch on (IG) 11 to 14 V
      4F-13 - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - IG2 NO. 1 RELAY) 
    1. Remove the IG2 NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the 4F instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4F-13 - No. 1 engine room relay block and No. 1 junction block assembly IG2 NO. 1 relay terminal 1 Always Below 1 Ω
      No. 1 engine room relay block and No. 1 junction block assembly IG2 NO. 1 relay terminal 2 - Body ground Always Below 1 Ω
      4F-13 or No. 1 engine room relay block and No. 1 junction block assembly IG2 NO. 1 relay terminal 1 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. INSPECT IG2 NO. 1 RELAY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
      GTY757901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 IG2 NO. 1 Relay

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

    Result: 

    NG 

    REPLACE IG2 NO. 1 RELAY 

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