PUSH-BUTTON START SYSTEM > Power Source Mode does not Change to ON (IG and ACC)

for Preparation Click here


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.

HINT:
  1. 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).
  2. When the auxiliary battery cable is disconnected and reconnected, the power source mode returns to the mode it was in before the auxiliary battery cable was disconnected.


WIRING DIAGRAM


B273650E01


INSPECTION PROCEDURE

NOTICE:
  1. 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.
  2. Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart (Click here).
  3. The push-button 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).
  4. If the push-button start system is disabled through the customize function, enable the system before performing troubleshooting (Click here).
  5. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  6. After completing repairs, confirm that the problem does not occur.


HINT:

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
  1. Start Switch1
  2. Start Switch2
  3. Power Supply Condition
  4. IG1 Relay Monitor(Inside)
  5. IG2 Relay Monitor(Inside)
  6. IG1 Relay Monitor(Outside)
  7. IG2 Relay Monitor(Outside)
  8. Latch Circuit
  9. ACC Relay Monitor
-

1.READ VALUE USING INTELLIGENT TESTER (KEY CANCEL SWITCH)

  1. Turn the power switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Entry&Start / Data List.

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

    Entry&Start 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Auto Entry Cancel SW
    		Push-button start cancel function setting / OFF or ON
    		Mode status displayed
    ON: push-button start system canceled
    OFF: push-button start system not canceled
    		The default setting for the push-button start cancel function is OFF. If the customer requests that the push-button start system functions be canceled, the setting can be changed through the customize function (Click here).
    Result 
    Result
    		Proceed to
    Push-button start cancel function is OFF
    		A
    Push-button start cancel function is ON
    		B



B
PERFORM CANCELLATION OF PUSH-BUTTON START CANCEL FUNCTION (Click here)
A


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

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

  1. 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


3.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


4.READ VALUE USING INTELLIGENT TESTER

  1. Reconnect the L5 and L6 connectors to the 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
    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
Go to step 10
OK


5.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
Go to step 8
OK


6.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
    		-

  1. 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


7.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)  

8.INSPECT POWER SWITCH


    C164809E24

  1. Remove the power switch (Click here).

  1. 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

    Text in Illustration 
    *a
    		Component without harness connected
    (Power Switch)



NG
REPLACE POWER SWITCH (Click here)
OK


9.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.

  1. 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)  

10.CHECK FOR DTC

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

  1. Check for DTCs.

    Result:
    Result
    		Proceed to
    The following DTCs are not output:
    1. B2785
    2. B2287
    3. 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