ENTRY AND START SYSTEM(for Start Function) Power Source Mode does not Change to ON (IG)

DESCRIPTION

If the power switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.

Related Data List and Active Test Items
Problem Symptom Data List and Active Test
Power source mode does not change to on (IG) but does change to on (ACC)

    Power Source Control

  • Power Supply Condition

  • IG Circuit

  • IG Relay Monitor (Outside)

  • IG Relay Monitor (Inside)

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the power switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart.

  • If the entry and start system (for Start Function) has been canceled, enable the system before performing troubleshooting.

    Click here

  • Inspect the fuses of circuits related to this system before performing the following procedure.

  • Before replacing the certification ECU (smart key ECU assembly), refer to entry and start system (for Start Function) Precaution.

    Click here

  • After completing repairs, confirm that the problem does not recur.

Tech Tips

When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

PROCEDURE


  1. CHECK FOR DTC


    1. Using the GTS, check for certification ECU (smart key ECU assembly) DTCs.


      Body Electrical > Power Source Control > Trouble Codes
      Body Electrical > Entry&Start > Trouble Codes
      Body Electrical > Starting Control > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      Entry and start system (for Start Function) DTCs are output B

    B
    A
  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the I1 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 3A and 3D 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
      I1-17 (IG1D) - 3A-17 Always Below 1 Ω
      3D-3 - Body ground Always Below 1 Ω
      I1-17 (IG1D) or 3A-17 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - NO. 1 INTEGRATION RELAY)


    1. Disconnect the 1A No. 1 integration relay connector.

    2. Disconnect the 3F 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
      3F-12 - 1A-2 Always Below 1 Ω
      3F-12 or 1A-2 - Body ground Always 10 kΩ or higher
      3F-13 - 1A-7 Always Below 1 Ω
      3F-13 or 1A-7 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1-NO. 1, IG1-NO. 2 RELAY)


    1. Remove the instrument panel junction block assembly.

      Click here

    2. Measure the resistance according to the value(s) in the table below.

      A003M1DC08
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-17 - 3D-3 20°C (68°F) 130.92 to 190.69 Ω
      3K-1 - 3A-35 Auxiliary battery voltage applied between terminals 3A-17 and 3D-3 Below 1 Ω
      Auxiliary battery voltage not applied between terminals 3A-17 and 3D-3 10 kΩ or higher
      3K-1 - 3A-11 Auxiliary battery voltage applied between terminals 3A-17 and 3D-3 Below 1 Ω
      Auxiliary battery voltage not applied between terminals 3A-17 and 3D-3 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  5. INSPECT NO. 1 INTEGRATION RELAY (IG2 NO. 1, IG1 NO. 3 RELAY)


    1. Remove the No. 1 integration relay.

      Click here

    2. Inspect the No. 1 integration relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the I1 certification ECU (smart key ECU assembly) connector.

    2. Install the instrument panel junction block assembly.

      Click here

    3. Install the No. 1 integration relay.

      Click here

    4. A003O5PC32
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I1-17 (IG1D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      Result
      Proceed to
      OK
      NG

    OK
    NG