SMART ENTRY AND START SYSTEM (for Start Function) 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

  • IG Relay Monitor (Inside)

  • IG Relay Monitor (Outside)

  • IG Circuit

 -

WIRING DIAGRAM

Refer to DTC B2271 Click here

INSPECTION PROCEDURE

Note


  • When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle 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 the 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 smart entry and start system (for Start Function) 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 smart entry and start system (for Start Function) 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 smart 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), ID code box (immobiliser code ECU) or main body ECU (multiplex network body ECU), refer to the smart entry and start system (for Start Function) 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.

PROCEDURE


  1. CHECK FOR DTC


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

      Result
      Result Proceed to
      DTCs are not output. A
      Smart entry and start system (for Start Function) 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) - IG1 RELAY)


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

    2. Remove the IG1 relay from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B75-20 (IG1D) - 1 (IG1 relay) Always Below 1 Ω
      2 (IG1 relay) - Body ground
      B75-20 (IG1D) or 1 (IG1 relay) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT IG1 RELAY


    1. Remove the IG1 relay from the instrument panel junction block assembly.

    2. A01BEKDE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE IG1 RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 2 INTEGRATION RELAY)


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 12D and 12E No. 2 integration relay connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B75-20 (IG1D) - 12D-2 Always Below 1 Ω
      12E-4 - Body ground
      B75-20 (IG1D) or 12D-2 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT NO. 2 INTEGRATION RELAY


    1. Remove the No. 2 integration relay.

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

      A01BBCKE02
      Text in Illustration
      *a

      Component without harness connected

      (No. 2 Integration Relay)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      12A-1 - 12D- 8 Battery voltage not applied to terminals 12D-2 and 12E-4 10 kΩ or higher
      Battery voltage applied to terminals 12D-2 and 12E-4 Below 1 Ω

    NG

    REPLACE NO. 2 INTEGRATION RELAY

    OK

  6. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the B75 certification ECU (smart key ECU assembly) connector.

    2. Install the IG1 relay.

    3. Install the No. 2 integration relay.

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

      A01BDZ2E01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      B75-20 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    USE SIMULATION METHOD TO CHECK Click here