PUSH-BUTTON START Power Source Mode does not Change to ON (IG)

DESCRIPTION

If the engine 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.

Tech Tips

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

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

    Power Source Control:

  • Power Supply Condition

  • IG1 Relay Monitor(Inside)

  • IG2 Relay Monitor(Inside)

  • IG1 Relay Monitor(Outside)

  • IG2 Relay Monitor(Outside)

  • IG1 Circuit

  • IG2 Circuit

 -

WIRING DIAGRAM

Refer to DTC B2271.

Click here

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine 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 a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the push-button start after confirming that the communication systems are functioning properly.

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

    Click here

  • If the entry and start system is disabled through the customize function, enable the system before performing troubleshooting.

    Click here

  • Before replacing the certification ECU (smart key ECU assembly), refer to the push-button start precaution.

    Click here

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

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

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INTEGRATION RELAY)


    1. Disconnect the A21 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 2E No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A21-9 (IG2D) - 2E-5 Always Below 1 Ω
      2E-16 - Body ground
      A21-9 (IG2D) - 2E-5 - Body ground 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT NO. 1 INTEGRATION RELAY (IG2 RELAY)


    1. B002E4PC08
      *a

      Component without harness connected

      (No. 1 Integration Relay)

      Remove the No. 1 integration relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2F-6 - 2D-1 Battery voltage not applied to terminals 2E-5 and 2E-16 10 kΩ or higher
      Battery voltage applied to terminals 2E-5 and 2E-16 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 INTEGRATION RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COWL SIDE JUNCTION BLOCK RH)


    1. Disconnect the K74 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 4A cowl side junction block RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K74-6 (IG1D) - 4A-25 Always Below 1 Ω
      4A-4 - Body ground
      K74-6 (IG1D) and 4A-25 - Body ground 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - COWL SIDE JUNCTION BLOCK LH)


    1. Disconnect the 4A cowl side junction block RH connector.

    2. Disconnect the 5A and 5B cowl side junction block LH connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4A-40 - 5A-35 Always Below 1 Ω
      5B-1 - Body ground
      4A-40 and 5A-35 - Body ground 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 5A and 5C cowl side junction block LH connectors.

    2. Disconnect the 6B and 6A luggage room junction block assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5C-13 - 6B-8 Always Below 1 Ω
      6A-9 - Body ground
      5C-13 and 6B-8 - Body ground 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT COWL SIDE JUNCTION BLOCK RH (RH-IG1 RLY1, RH-IG1 RLY2 RELAY)


    1. Remove the cowl side junction block RH.

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

      B002EWUC02
      *a

      Component without harness connected

      (Cowl Side Junction Block RH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4E-1 - 4D-4 Battery voltage not applied to terminals 4A-25 and 4A-4 10 kΩ or higher
      Battery voltage applied to terminals 4A-25 and 4A-4 Below 1 Ω
      4E-1 - 4A-3 Battery voltage not applied to terminals 4A-25 and 4A-4 10 kΩ or higher
      Battery voltage applied to terminals 4A-25 and 4A-4 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COWL SIDE JUNCTION BLOCK RH

    OK

  7. INSPECT COWL SIDE JUNCTION BLOCK LH (LH-IG1 RLY1, LH-IG1 RLY2 RELAY)


    1. Remove the cowl side junction block LH.

      Click here

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

      B002CG1C02
      *a

      Component without harness connected

      (Cowl Side Junction Block LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      5E-1 - 5B-7 Battery voltage not applied to terminals 5A-35 and 5B-1 10 kΩ or higher
      Battery voltage applied to terminals 5A-35 and 5B-1 Below 1 Ω
      5E-1 - 5C-4 Battery voltage not applied to terminals 5A-35 and 5B-1 10 kΩ or higher
      Battery voltage applied to terminals 5A-35 and 5B-1 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) Click here

    OK

  8. INSPECT LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY (RR-IG1 RLY1, RR-IG1 RLY2 RELAY)


    1. Remove the luggage room junction block assembly.

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

      B002DLJC03
      *a

      Component without harness connected

      (Luggage Room Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      6D-1 - 6B-14 Battery voltage not applied to terminals 6B-8 and 6A-9 10 kΩ or higher
      Battery voltage applied to terminals 6B-8 and 6A-9 Below 1 Ω
      6D-1 - 6A-8 Battery voltage not applied to terminals 6B-14 and 6A-9 10 kΩ or higher
      Battery voltage applied to terminals 6B-14 and 6A-9 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY

    OK

  9. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


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

      B002E0KC02
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A21-9 (IG2D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher
      K74-6 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    CHECK RELAY CONTACT SIDE CIRCUIT Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)