ENTRY AND START SYSTEM (for Start Function) Power Source Mode does not Change to ON (IG and ACC)

DESCRIPTION

When the key is in the vehicle and the power switch is pressed, the power management control ECU receives a signal and changes the power source mode.

Tech Tips


  • When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) auxiliary battery terminal, the power source mode changes to on (IG).

  • When the auxiliary battery cable is disconnected and reconnected, the power source returns to the mode it was in before the auxiliary battery cable was disconnected.

WIRING DIAGRAM

A003ZCWE01

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle, select the vehicle type under manual mode, and then enter the following menus:

    for Power Source Control: Body / Power Source Control / DTC.

    for Entry&Start: Body / Entry&Start / DTC.

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

  • The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.

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

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

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

Tech Tips

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

    Power Source Control

  • Start Switch1

  • Start Switch2

  • Power Supply Condition

  • IG1 Relay Monitor(Inside)

  • IG2 Relay Monitor(Inside)

  • IG1 Relay Monitor(Outside)

  • IG2 Relay Monitor(Outside)

  • Latch Circuit

  • ACC Relay Monitor

 -

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the H3 and H4 connectors from the power management control ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H3-1 (AM22) - Body ground Always 9.5 to 16 V
      H4-7 (AM21) - Body ground Always 9.5 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H3-5 (E01) - Body ground Always Below 1 Ω
      H3-6 (E1) - Body ground Always Below 1 Ω
      H4-4 (E12) - Body ground Always Below 1 Ω
      H4-5 (E02) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. READ VALUE USING INTELLIGENT TESTER


    1. Reconnect the L5 and L6 connectors to the power management control ECU.

    2. Turn the power switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the power switch on (IG).

    5. Turn the intelligent tester on.

    6. Enter the following menus: Body / Power Source Control / Data List.

    7. Read the Data List according to the display on the intelligent tester.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Key Certification Waiting Timed Out Key certification error detection/ No or Yes

      No: Key certification error not detected

      Yes: Key certification error detected

      		 -
      OK
      When more than 1 second elapses after the power switch is turned from off to on (IG), No is displayed in the Data List.

    NG

    CHECK FOR DTC Click here

    OK

  4. READ VALUE USING INTELLIGENT TESTER


    1. Read the Data List according to the display on the intelligent tester.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Start Switch1 Start switch 1/ON or OFF

      ON: Power switch pushed

      OFF: Power switch not pushed

      		 -
      Start Switch2 Start switch 2/ON or OFF

      ON: Power switch pushed

      OFF: Power switch not pushed

      		 -
      OK
      ON (power switch is pushed) and OFF (power switch is not pushed) appear on the screen.

    NG

    INSPECT POWER SWITCH Click here

    OK

  5. CHECK POWER MANAGEMENT CONTROL ECU


    1. Read the Data List according to the display on the intelligent tester.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Power Supply Condition Power supply condition/All OFF, ACC ON, IG1 ON, IG2 ON, ST ON

      ALL OFF: All relays off

      ACC ON: ACC relay on

      IG1 ON: IG1 relay on

      IG2 ON: IG2 relay on

      ST ON: ST request signal on

      		 -

    2. Measure the voltage while checking the Data List on the intelligent tester.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H4-2 (IG1D) - Body ground Power switch off Below 1 V
      H4-2 (IG1D) - Body ground Power switch on (ACC) Below 1 V
      H4-2 (IG1D) - Body ground Power switch on (IG) Output voltage at terminal AM21 or AM22 is -2.5 V or more
      A20-2 (IG2D) - Body ground Power switch off Below 1 V
      A20-2 (IG2D) - Body ground Power switch on (ACC) Below 1 V
      A20-2 (IG2D) - Body ground Power switch on (IG) Output voltage at terminal AM21 or AM22 is -2.5 V or more
      H4-1 (ACCD) - Body ground Power switch off Below 1 V
      H4-1 (ACCD) - Body ground Power switch on (IG) Output voltage at terminal AM21 or AM22 is -2.5 V or more
      H4-1 (ACCD) - Body ground Power switch on (ACC) Output voltage at terminal AM21 or AM22 is -2.5 V or more

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  6. CONFIRMATION TEST


    1. Check that the power source mode becomes on (ACC) and on (IG) when the power switch is operated.

      OK
      Power source mode becomes on (ACC) and on (IG) when the power switch is operated.

    NG

    CHECK RELAY CONTACT SIDE CIRCUIT

    OK

    USE SIMULATION METHOD TO CHECK Click here

  7. INSPECT POWER SWITCH


    1. A003WTHE24
      Text in Illustration
      *a

      Component without harness connected

      (Power Switch)

      Remove the power switch Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H78-7 (SS1) - H78-5 (GND) Pushed Below 1 Ω
      H78-7 (SS1) - H78-5 (GND) Not pushed 10 kΩ or higher
      H78-2 (SS2) - H78-5 (GND) Pushed Below 1 Ω
      H78-2 (SS2) - H78-5 (GND) Not pushed 10 kΩ or higher

    NG

    REPLACE POWER SWITCH Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (POWER SWITCH - POWER MANAGEMENT CONTROL ECU AND BODY GROUND)


    1. Disconnect the H3 and H4 connectors from the power management control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H4-17 (SSW2) - H78-2 (SS2) Always Below 1 Ω
      H3-7 (SSW1) - H78-7 (SS1) Always Below 1 Ω
      H4-17 (SSW2) - Body ground Always 10 kΩ or higher
      H3-7 (SSW1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  9. CHECK FOR DTC


    1. Enter the following menus: Body / Power Source Control and Entry&Start / DTC.

    2. Check for DTCs.

      Result
      Result Proceed to

      The following DTCs are not output:


      • B2785

      • B2287

      • B2784

      		 A
      DTC B2785 is not output but DTC B2287 is output. B
      DTCs other than B2287 are output. C

    A

    GO TO OTHER FLOW CHART (Room Oscillator does not Recognize Key) Click here

    B

    GO TO OTHER FLOW CHART (DTC B2287) Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART