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

DTC Code DTC Name
Power Source Mode does not Change to ON (ACC)

DESCRIPTION

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

Use this troubleshooting procedure when the power source mode does not change to on (ACC) but does change to on (IG).

Tip:

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

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

WIRING DIAGRAM

Refer to "Power Source Mode does not Change to on (IG and ACC)" (Click here).

CAUTION / NOTICE / HINT

Note:

  • When using the intelligent tester with the engine 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 and select "MANUAL" from the initial screen on the intelligent tester, and then select "KEY REGIST" under Model Code.

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

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

Tip:
Table 1. Related Data List and Active Test Items

Problem Symptom

Data List Item

Active Test Item

Power source mode does not change to on (ACC) but does change to on (IG)

  • Power Source Control

  • ACC Relay Monitor

  • Power Supply Condition

  • Starting Control

  • Ignition

-

PROCEDURE

  1. CHECK DTC (ALL)

    1. Using the intelligent tester, confirm the output of DTCs for all systems.

      OK

      No DTCs are output.

      Note:

      • When using the intelligent tester with the engine 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: Body / Entry&Start / DTC.

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

      Body Electrical > Entry&Start > Trouble Codes

      Result

      Result

      OK

      NG
    NG

    GO TO DTC CHART

    OK

  2. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC RELAY)

    1. B232807C01

      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

      Disconnect the 2A and 2D driver side junction block assembly connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2A-48 - 2D-4

      20°C (68°F)

      50.63 to 123.75 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

    OK

  3. CHECK HARNESS AND CONNECTOR (MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

    1. Disconnect the 2A and 2D driver side junction block assembly connectors.

    2. Disconnect the G39 power management control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G39-19 (ACCD) - 2A-48

      Always

      Below 1 Ω

      2D-4 - Body ground

      Always

      Below 1 Ω

      G39-19 (ACCD) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK POWER MANAGEMENT CONTROL ECU

    1. Connect the power management control ECU connectors.

      C182533C02

      *a

      Component with harness connected

      (Power Management Control ECU)

      -

      -

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G39-19 (ACCD) - Body ground

      Engine switch off

      1 V or less

      Engine switch on (ACC)

      8.5 V or higher

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU

    Click here