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

DESCRIPTION

If the power switch is pressed with the electrical key transmitter sub-assembly in the cabin, the power management control ECU receives a signal and changes the power source mode.

Tech Tips

When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

WIRING DIAGRAM

A01V1HKE04
*a from Auxiliary Battery
*b Instrument Panel Junction Block Assembly
*c Power Management Control ECU

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the vehicle power 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 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.

  • Before replacing the power management control ECU or electrical key transmitter sub-assembly, refer to the entry and start system (for Entry Function) precaution Click here.

  • 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.

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

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

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 (ACC) but does change to on (IG)

    Power Source Control

  • Power Supply Condition

  • ACC Relay Monitor

 -

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the F56 power management control ECU connector.

    2. Disconnect the 3B instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F56-1 (ACCD) - 3B-37 Always Below 1 Ω
      3B-8 - Body ground Always Below 1 Ω
      F56-1 (ACCD) or 3B-37 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

      A01V20GE02
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Remove the main body ECU from the instrument panel junction block assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3E-1 - MB-29 Auxiliary battery voltage not applied to terminals 3B-37 and 3B-8 10 kΩ or higher
      Auxiliary battery voltage applied to terminals 3B-37 and 3B-8 Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  3. INSPECT POWER MANAGEMENT CONTROL ECU

    A01UXIXE01
    Text in Illustration
    *a

    Component with harness connected

    (Power Management Control ECU)

    1. Reconnect the power management control ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F56-1 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher

    OK

    CHECK RELAY CONTACT SIDE CIRCUIT

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here