Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

Engine. Lexus Is250, Is220D. Gse20 Ale20
2Ad-Fhv Starting. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (AM2)

CHECK CONNECTORS

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

CHECK FOR DTCS

READ VALUE OF INTELLIGENT TESTER

INSPECT RELAY (IG2)

INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY, ACC RELAY, PWR POINT RELAY)

CHECK WIRE HARNESS

INSPECT POWER SOURCE CONTROL ECU

INSPECT ENGINE SWITCH

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU AND BODY GROUND - ENGINE SWITCH)

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


DESCRIPTION

When the engine switch is pushed with the electrical key in the cabin, the power source control ECU receives signals to switch the power source mode.
HINT:
To allow use of the intelligent tester to inspect the entry and start system when the engine switch is off, repeat opening and closing any of the doors. Opening and closing a door establishes communication between the intelligent tester and the power source control ECU. (Opening and closing a door can also be simulated by operating a door courtesy light switch.)

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)


Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)


INSPECTION PROCEDURE

1.INSPECT FUSE (AM2)

  1. Remove the AM2 fuse from the cowl side J/B RH.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


2.CHECK CONNECTORS

  1. Check that the connectors are securely connected and the terminals are not deformed or loose.

    OK:
    The connectors are securely connected and the terminals are not deformed or loose.


NG
REPAIR OR REPLACE CONNECTORS
OK


3.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

  1. Disconnect the J55 ECU connector.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-33 (AM1) - Body ground
    		Always
    		10 to 14 V
    J55-12 (AM2) - Body ground
    		Always
    		10 to 14 V

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-6 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK FOR DTCS

  1. Delete the DTCs (Click here).

    HINT:
    After all the DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG).

  1. Check for DTCs again.

    OK:
    No DTC is output.


NG
GO TO DTC CHART
OK


5.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Check the DATA LIST for proper functioning of the start switches 1 and 2.

    Power Source Control:
    Item
    		Measurement Item/Display (Range)
    		Normal Condition
    		Diagnostic Note
    St SW1
    		Start Switch 1/ ON or OFF
    		ON: Engine switch on (IG)
    OFF: Engine switch OFF
    		-
    St SW2
    		Start Switch 2/ ON or OFF
    		ON: Engine switch on (IG)
    OFF: Engine switch OFF
    		-
    OK:
    ON (engine switch on (IG)) and OFF (engine switch off) appear on the screen.


NG
Go to step 10
OK


6.INSPECT RELAY (IG2)


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

  1. Remove the IG2 relay from the engine room R/B No. 2.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 5
    		10 kΩ or higher
    3 - 5
    		Below 1 Ω
    (When battery voltage is applied to terminals 1 and 2)


NG
REPLACE RELAY (IG2)
OK


7.INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY, ACC RELAY, PWR POINT RELAY)


  1. RH-IG relay:


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

    1. Disconnect the cowl side J/B RH connectors.

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

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      RD-6 - RA-5 or RD-7
      		Always
      		136 to 250 Ω at 20°C (68°F)
      RD-6 - Body ground
      		Always
      		10 kΩ or higher
      RD-2 - RA-5 or RD-7
      		Always
      		68 to 250 Ω at 20°C (68°F)
      RD-2 - Body ground
      		Always
      		10 kΩ or higher
      RD-6 - RD-12
      		Always
      		Below 1 Ω
      RM-1 - RD-14
      		When battery voltage is applied to terminals RD-6 and RA-5 or RD-7
      		Below 1 Ω
      RM-1 - RD-27
      		When battery voltage is applied to terminals RD-2 and RA-5 or RD-7
      		Below 1 Ω
      RM-1 - RJ-16
      		When battery voltage is applied to terminals RD-2 and RA-5 or RD-7
      		Below 1 Ω


  1. LH-IG relay:


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

    1. Disconnect the cowl side J/B LH connectors.

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

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      LD-13 - LD-8 or LD-9
      		Always
      		68 to 250 Ω at 20°C (68°F)
      LD-13 - Body ground
      		Always
      		10 kΩ or higher
      LM-1 - LK-6
      		When battery voltage is applied to terminals LD-13 and LD-8 or LD-9
      		Below 1 Ω
      LM-1 - LD-29
      		When battery voltage is applied to terminals LD-13 and LD-8 or LD-9
      		Below 1 Ω


NG
REPLACE JUNCTION BLOCK
OK


8.CHECK WIRE HARNESS


  1. Inspect the resistance and voltage (Power source control ECU or battery - IG2 relay).


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

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

      Standard resistance:
      Tester Connection (Symbols)
      		Condition
      		Specified Condition
      J55-35 (IG2D) - IG2 relay terminal 2
      		Always
      		Below 1 Ω
      IG2 relay terminal 1 - Body ground
      		Always
      		Below 1 Ω
      J55-35 (IG2D) or IG2 relay terminal 2 - Body ground
      		Always
      		10 kΩ or higher

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

      Standard voltage:
      Tester Connection
      		Condition
      		Specified Condition
      IG2 relay terminal 5 - Body ground
      		Always
      		10 to 14 V


  1. Inspect the resistance and voltage (Power source control ECU or battery - Cowl side J/B RH).


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

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

      Standard resistance:
      Tester Connection (Symbols)
      		Condition
      		Specified Condition
      J55-34 (IG1D) - RD-6
      		Always
      		Below 1 Ω
      J55-11 (ACCD) - RD-2
      		Always
      		Below 1 Ω
      RD-7 - Body ground
      		Always
      		Below 1 Ω
      RA-5 - Body ground
      		Always
      		Below 1 Ω
      J55-34 (IG1D) or RD-6 - Body ground
      		Always
      		10 kΩ or higher
      J55-11 (ACCD) or RD-2 - Body ground
      		Always
      		10 kΩ or higher

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

      Standard voltage:
      Tester Connection
      		Condition
      		Specified Condition
      RM-1 - Body ground
      		Always
      		10 to 14 V


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

  1. Inspect the resistance (Cowl side J/B RH - Cowl side J/B LH).

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

      Standard resistance:
      Tester Connection (Symbols)
      		Condition
      		Specified Condition
      RD-12 - LD-13
      		Always
      		Below 1 Ω
      LD-8 - Body ground
      		Always
      		Below 1 Ω
      LD-9 - Body ground
      		Always
      		Below 1 Ω


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

  1. Inspect the voltage (Battery - Cowl side J/B LH).

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

      Standard voltage:
      Tester Connection
      		Condition
      		Specified Condition
      LM-1 - Body ground
      		Always
      		10 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.INSPECT POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

  1. Reconnect the J55 ECU connector.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-34 (IG1D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.
    J55-35 (IG2D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.
    J55-11 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (ACC)
    		Output voltage at terminal AM2 is -2 V or more.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (COWL SIDE J/B - EACH SYSTEM)

10.INSPECT ENGINE SWITCH


  1. Remove the engine switch.


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

  1. Measure the resistance of the switch.

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


NG
REPLACE ENGINE SWITCH
OK


11.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU AND BODY GROUND - ENGINE SWITCH)


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig And Acc)

  1. Disconnect the J55 ECU connector.

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J31-7 (SS1) - J55-14 (SSW1)
    		Always
    		Below 1 Ω
    J31-2 (SS2) - J55-37 (SSW2)
    		Always
    		Below 1 Ω
    J31-5 (GND) - Body ground
    		Always
    		Below 1 Ω
    J31-7 (SS1) or J55-14 (SSW1) - Body ground
    		Always
    		10 kΩ or higher
    J31-2 (SS2) or J55-37 (SSW2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER SOURCE CONTROL ECU