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 "System Diagram" 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 the vehicle type under manual mode and enter the following menus:

    Body Electrical / Entry&Start. 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 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 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 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 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 DTCs.

      Result
      Result Proceed to
      DTCs are not output A
      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) - COWL SIDE JUNCTION BLOCK LH)


    1. Disconnect the E128 connector from the certification ECU (smart key ECU assembly).

    2. Disconnect the 2I and 2J connectors from the connector from the cowl side junction block LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E128-3 (IG1D) - 2I-18 Always Below 1 Ω
      2J-1 - Body ground
      E128-3 (IG1D) and 2I-18 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - INTEGRATION RELAY (IG2 MAIN RELAY))


    1. Disconnect the 2H connector from the cowl side junction block LH.

    2. Disconnect the 1R and 1S connectors from the integration relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2H-18 - 1R-2 Always Below 1 Ω
      1S-4 - Body ground
      2H-18 and 1R-2 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - IG1 RELAY)


    1. Disconnect the 2H connector from the cowl side junction block LH.

    2. Remove the IG1 relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2H-17 - 1 (IG1 relay) Always Below 1 Ω
      2 (IG1 relay) - Body ground
      2H-17 and 1 (IG1 relay) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INTEGRATION RELAY (IG2-MAIN RELAY)


    1. Remove the integration relay.

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

      B001Z88E01
      Text in Illustration
      *A for RHD *B for LHD
      *1 Integration Relay (IG2 MAIN Relay) - -
      Standard Resistance
      for RHD:
      Tester Connection Condition Specified Condition
      1X-1 - 1P-7 Battery voltage not applied to terminals 1R-2 and 1S-4 10 kΩ or higher
      Battery voltage applied to terminals 1R-2 and 1S-4 Below 1 Ω
      for LHD:
      Tester Connection Condition Specified Condition
      1Y-1 - 1P-7 Battery voltage not applied to terminals 1R-2 and 1S-4 10 kΩ or higher
      Battery voltage applied to terminals 1R-2 and 1S-4 Below 1 Ω

    NG

    REPLACE INTEGRATION RELAY (IG2 MAIN RELAY)

    OK

  6. INSPECT IG1 RELAY


    1. Remove the IG1 relay.

    2. B001YPWE80
      Text in Illustration
      *1 IG1 Relay

      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 2 and 1 10 kΩ or higher
      Battery voltage applied to terminals 2 and 1 Below 1 Ω

    NG

    REPLACE IG1 RELAY

    OK

  7. INSPECT COWL SIDE JUNCTION BLOCK LH (IG1 NO. 1,IG1 NO. 2, IG1 NO. 3 RELAY)


    1. Remove the cowl side junction block LH.


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

      B001Y85E01
      Text in Illustration
      *a

      Component without harness connected

      (Cowl Side Junction Block LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      2G-1 - 2I-19 Battery voltage not applied to terminals 2I-18 and 2J-1 10 kΩ or higher
      Battery voltage applied to terminals 2I-18 and 2J-1 Below 1 Ω
      2G-1 - 2I-33 Battery voltage not applied to terminals 2I-18 and 2J-1 10 kΩ or higher
      Battery voltage applied to terminals 2I-18 and 2J-1 Below 1 Ω
      2G-1 - 2I-11 Battery voltage not applied to terminals 2I-18 and 2J-1 10 kΩ or higher
      Battery voltage applied to terminals 2I-18 and 2J-1 Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG for LHD B
      for RHD C

    B

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

    C

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

    A

  8. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. B001WD3E01
      Text in Illustration
      *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
      E128-3 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher

    OK

    CHECK USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)