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

  • 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

INSPECTION PROCEDURE

Note


  • When using the GTS with the engine switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

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


    1. Disconnect the A34 connectors from the certification ECU (smart key ECU assembly).

    2. Disconnect the 2E and 2F connectors from the No. 1 integration relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A34-9 (IG2D) - 2E-2 Always Below 1 Ω
      2F-1 - Body ground
      A34-9 (IG2D) - 2E-2 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01FHPJE05
      Text in Illustration
      *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-2 and 2F-1 10 kΩ or higher
      Battery voltage applied to terminals 2E-2 and 2F-1 Below 1 Ω

    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 N93 connector from the certification ECU (smart key ECU assembly).

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N93-6 (IG1D) - 4A-25 Always Below 1 Ω
      4A-4 - Body ground
      N93-6 (IG1D) and 4A-25 - Body ground 10 kΩ or higher

    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 connector from the cowl side junction block RHr.

    2. Disconnect the 5A and 5B connectors 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
      4A-40 - 5A-35 Always Below 1 Ω
      5B-1 - Body ground
      4A-40 and 5A-35 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - NO. 1 JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 5C connector from the cowl side junction block LH.

    2. Disconnect the 6B and 6A connectors from the No. 1 junction block assembly.

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT COWL SIDE JUNCTION BLOCK RH (RH-IG1 1, RH-IG1 2 RELAY)


    1. Remove the cowl side junction block RH.

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

      A01FH0XE01
      Text in Illustration
      *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

    NG

    REPLACE COWL SIDE JUNCTION BLOCK RH

    OK

  7. INSPECT COWL SIDE JUNCTION BLOCK LH (LH-IG1 1, LH-IG1 2 RELAY)


    1. Remove the cowl side junction block LH Click here.

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

      A01FD8YE01
      Text in Illustration
      *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

    NG

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

    OK

  8. INSPECT NO. 1 JUNCTION BLOCK ASSEMBLY (RR-IG1 1, RR-IG1 2 RELAY)


    1. Remove the No. 1 junction block assembly.

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

      A01FHNPE01
      Text in Illustration
      *a

      Component without harness connected

      (No. 1 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

    NG

    REPLACE NO. 1 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.

      A01FI9AE17
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      A34-9 (IG2D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher
      N93-6 (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

    CHECK RELAY CONTACT SIDE CIRCUIT Click here