PUSH-BUTTON START 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 Relay Monitor (Inside)

  • IG Relay Monitor (Outside)

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 push-button start uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the push-button start 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 push-button start 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) or main body ECU (multiplex network body ECU), refer to push-button start 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 DTCs.


      Body Electrical > Power Source Control > Trouble Codes
      Body Electrical > Entry&Start > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      Push-button start DTCs are output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

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


    1. Disconnect the A83 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 4B and 4C 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
      A83-3 (IG1D) - 4C-22 Always Below 1 Ω
      4B-7 - Body ground Always Below 1 Ω
      A83-3 (IG1D) or 4C-22 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SEMICONDUCTOR PWR INTEGRATION ECU)


    1. Disconnect the 1E semiconductor pwr integration ECU connector.

    2. Disconnect the 4C 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
      4C-11 - 1E-1 Always Below 1 Ω
      4C-11 or 1E-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - IG1 MAIN RELAY)


    1. Disconnect the 4C instrument panel junction block assembly connector.

    2. Remove the IG1 MAIN relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4C-17 - 1 (IG1 MAIN relay) Always Below 1 Ω
      2 (IG1 MAIN relay) - Body ground Always Below 1 Ω
      4C-17 or 1 (IG1 MAIN relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2, IG1 NO. 3 RELAY)


    1. Remove the instrument panel junction block assembly.

      Click here

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

      A00209EC02
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4C-22 - 4B-7 20°C (68°F) 87.32 to 127.14 Ω
      4E-1 - 4A-16 Auxiliary battery voltage applied to terminals 4C-22 and 4B-7 Below 1 Ω
      Auxiliary battery voltage not applied to terminals 4C-22 and 4B-7 10 kΩ or higher
      4E-1 - 4A-35 Auxiliary battery voltage applied to terminals 4C-22 and 4B-7 Below 1 Ω
      Auxiliary battery voltage not applied to terminals 4C-22 and 4B-7 10 kΩ or higher
      4E-1 - 4B-32 Auxiliary battery voltage applied to terminals 4C-22 and 4B-7 Below 1 Ω
      Auxiliary battery voltage not applied to terminals 4C-22 and 4B-7 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  6. INSPECT SEMICONDUCTOR PWR INTEGRATION ECU (IG2 RELAY)


    1. Remove the semiconductor pwr integration ECU.

      Click here

    2. Inspect the semiconductor pwr integration ECU.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU (IG2 RELAY) Click here

    OK

  7. INSPECT IG1 MAIN RELAY


    1. Remove the IG1 MAIN relay.

    2. A0022LCC01
      *1 IG1 MAIN Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage applied to terminals 1 and 2 Below 1 Ω
      Auxiliary battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IG1 MAIN RELAY

    OK

  8. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the A83 certification ECU (smart key ECU assembly) connector.

    2. Install the instrument panel junction block assembly.

      Click here

    3. Install the semiconductor pwr integration ECU.

      Click here

    4. Install the IG1 MAIN relay.

    5. A0022NZC91
      *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
      A83-3 (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

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)