SMART KEY SYSTEM (for Start Function) Power Source Mode does not Change to ON (IG and ACC)

DESCRIPTION

If any of the following operations are performed, 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 (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

  • If the room oscillator does not recognize the key, the cause of the malfunction may be stored in the certification ECU (smart key ECU assembly) Click here.

  • If the cause of the malfunction is stored in the certification ECU (smart key ECU assembly), the following table is helpful in checking whether or not the malfunction was caused by wave interference.

Radio Wave Interference:
Problem Symptom Data List Item
Operating Engine Switch / Key RF Signal Interference

  • When the power switch was operated, the electrical key transmitter sub-assembly could not be confirmed due to wave interference. Therefore, the output frequency was switched to the other channel (changed from channel 1 to channel 2 or from channel 2 to channel 1).

  • If the cause of the malfunction has not been stored but any devices that can cause wave interference in the cabin have been removed and the room oscillator successfully recognizes the key, the possibility of wave interference is high.

WIRING DIAGRAM

A01I2CME05
A01I29DE04

INSPECTION PROCEDURE

Note


  • When using the Techstream 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 Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus:

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

    for Smart Key: Body Electrical / Smart Key / DTC.

  • The smart key 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 smart key system (for Start Function) after confirming that the communication systems are functioning properly.

  • Before replacing the electrical key transmitter sub-assembly, refer to the smart key system (for Start 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 smart key 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.

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 WIRELESS DOOR LOCK CONTROL SYSTEM


    1. Check the wireless door lock function by operating the electrical key transmitter sub-assembly.

      OK
      Wireless door lock function operates.

    NG

    GO TO OTHER PROBLEM (All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A01I2KLE07
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

    1. Disconnect the I3 and I4 connector 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
      I3-1 (AM22) - Body ground Power switch off 11 to 14 V
      I4-7 (AM21) - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND)

    A01I2KLE08
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I3-5 (E01) - Body ground Always Below 1 Ω
      I3-6 (E1) - Body ground Always Below 1 Ω
      I4-4 (E12) - Body ground Always Below 1 Ω
      I4-5 (E02) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK SMART KEY SYSTEM


    1. Remove the auxiliary battery from the electrical key transmitter sub-assembly Click here.

    2. A01I5Q4E01
      Text in Illustration
      *1 Power Switch
      *2 Electrical Key Transmitter Sub-assembly

      With the brake pedal depressed, hold the electrical key transmitter sub-assembly near the power switch and check if the power source mode changes.

      OK
      The power source mode changes.

      Tech Tips

      If the power source mode changes, the cabin verification is malfunctioning.

      Result
      Result Proceed to
      The power source mode does not change. A
      The power source mode changes. B

    B

    READ VALUE USING TECHSTREAM Click here

    A

  5. READ VALUE USING TECHSTREAM


    1. Connect the Techstream to the DLC3.

    2. Turn the Techstream on.

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

    4. Read the Data List according to the display on the Techstream.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Specified Condition
      Stop Light Switch1 State of brake pedal/ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      • Use this item to determine whether the stop light switch is malfunctioning.

      • The hybrid control system cannot be started when this item is OFF.

      • When this item is malfunctioning, the hybrid control system can be started by pressing and holding the power switch for a certain period of time.
      OK
      ON (brake pedal is depressed) and OFF (brake pedal is released) appear on the screen.

    NG

    INSPECT STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  6. READ VALUE USING TECHSTREAM


    1. Read the Data List according to the display on the Techstream.

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

      All OFF: Power switch off (ACC and IG)

      ACC ON: Power switch on (ACC)

      IG1 ON: Power switch on (IG) (IG1 relay on)

      IG2 ON: Power switch on (IG) (IG2 relay on)

      ST ON: Sending hybrid control system start request signal

      		 Since the IG1 and IG2 relays turn on at approximately the same time, IG1 ON may not be displayed (the IG1 relay turns on for a very short time).

    2. With the power switch off and brake pedal depressed, hold the electrical key transmitter sub-assembly near the power switch for 2 seconds or more and read the Data List.

      OK
      IG2 ON is displayed in the Data List.

      Tech Tips

      If the smart key system function has been canceled on the customization menu, ACC ON is displayed in the Data List.


    NG

    CHECK FOR DTC Click here

    OK

  7. CHECK POWER MANAGEMENT CONTROL ECU


    1. Read the Data List according to the display on the Techstream.

    2. A01I3PRE02
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

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

    3. Read the Data List according to the display on the Techstream.

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

      All OFF: Power switch off (ACC and IG)

      ACC ON: Power switch on (ACC)

      IG1 ON: Power switch on (IG) (IG1 relay on)

      IG2 ON: Power switch on (IG) (IG2 relay on)

      ST ON: Sending hybrid control system start request signal

      		 Since the IG1 and IG2 relays turn on at approximately the same time, IG1 ON may not be displayed (the IG1 relay turns on for a very short time).

    4. Measure the voltage while checking the Data List on the Techstream.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I4-2 (IG1D) - Body ground Power switch off 1 V or less
      Power switch on (ACC) 1 V or less
      Power switch on (IG) 9 V or higher
      A39-2 (IG2D) - Body ground Power switch off 1 V or less
      Power switch on (ACC) 1 V or less
      Power switch on (IG) 9 V or higher
      I4-1 (ACCD) - Body ground Power switch off 1 V or less
      Power switch on (IG) 8.5 V or higher
      Power switch on (ACC) 8.5 V or higher

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    CHECK RELAY CONTACT SIDE CIRCUIT

  8. READ VALUE USING TECHSTREAM


    1. Read the Data List according to the display on the Techstream.

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

      ON: Power switch pressed

      OFF: Power switch not pressed

      • If the power switch is pressed for a short time, the display may not change.

      • Use this item to determine whether the power switch input signal is malfunctioning.
      Start Switch2 Power switch 2 status/ON or OFF

      ON: Power switch pressed

      OFF: Power switch not pressed

      • Backup for power switch 1. However, when the power switch is pressed and held, the control functions only when both power switch 1 and 2 are normal.

      • Behaves the same way as power switch 1.
      OK
      ON (Power switch is pressed) and OFF (Power switch is not pressed) appear on the screen.
      Result
      Result Proceed to
      NG A
      OK B

    B

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

    A

  9. INSPECT POWER SWITCH


    1. Inspect the power switch Click here.


    NG

    REPLACE POWER SWITCH Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - POWER SWITCH)


    1. Disconnect the I58 connector 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
      I3-7 (SSW1) - I58-5 (SS1) Always Below 1 Ω
      I4-17 (SSW2) - I58-1 (SS2) Always Below 1 Ω
      I3-7 (SSW1) or I58-5 (SS1) - Body ground Always 10 kΩ or higher
      I4-17 (SSW2) or I58-1 (SS2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  11. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Disconnect the A33 connector from the stop light switch assembly.

    2. Inspect the stop light switch assembly Click here.


    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STOP LIGHT SWITCH ASSEMBLY)


    1. Disconnect the A33 connector from the stop light switch assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I4-10 (STP) - A33-1 Always Below 1 Ω
      I4-10 (STP) or A33-1 - Body ground Always 10 kΩ or higher

    3. Reconnect the A33 stop light switch assembly connector.

    4. A01I5Y3E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the I4 connector from the power management control ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I4-10 (STP) - Body ground Brake pedal released 1 V or less
      Brake pedal depressed 9 V or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  13. CHECK FOR DTC


    1. Enter the following menus:

      for Smart Key: Body Electrical /Smart Key / Trouble Codes.

    2. Check for DTCs.

      Result
      Result Proceed to

      The following DTCs are not output:


      • B2785

      • B2287

      • B2784

      • B278A

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

    B

    GO TO FLOW CHART (DTC B2287) Click here

    C

    GO TO OTHER PROBLEM

    A

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY Click here