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

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse 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)

INSPECT RELAY (IG2 RELAY)

INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY)

CHECK WIRE HARNESS

INSPECT POWER SOURCE CONTROL ECU

REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU

REPLACE FAULTY WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU

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


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 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)


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 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

  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.INSPECT RELAY (IG2 RELAY)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

  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
Go to step 8
OK


5.INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY)


  1. RH-IG relay:


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

    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 - RD-12
      		Always
      		Below 1 Ω
      RD-6 - Body ground
      		Always
      		10 kΩ or higher
      RM-1 - RD-14
      		When battery voltage is applied to terminals RD-6 and RD-12 or RA-5 or RD-7)
      		Below 1 Ω


  1. LH-IG relay:


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

    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
Go to step 8
OK


6.CHECK WIRE HARNESS


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


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

    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 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

    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
      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

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

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


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

  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-3
      		Always
      		Below 1 Ω
      RD-12 - Body ground
      		Always
      		10 kΩ or higher
      LD-18 - Body ground
      		Always
      		Below 1 Ω
      LD-9 - Body ground
      		Always
      		Below 1 Ω


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

  1. Inspect the voltage (Battery - Cowl side J/B LH).
    Measure the voltage according to the value(s) in the table below.

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


NG
Go to step 9
OK


7.INSPECT POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

  1. Reconnect the connectors.

  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.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

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

8.REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

  1. Replace a faulty relay or J/B and then connect the power source control 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.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

END

9.REPLACE FAULTY WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.Entry And Start System Power Source Mode Does Not Change To On (Ig)

  1. Repair or replace a faulty wire harness or connector and then connect the power source control 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


NG
REPLACE POWER SOURCE CONTROL ECU
OK

END