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

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (AM2)

CHECK CONNECTORS

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

INSPECT COWL SIDE JUNCTION BLOCK RH (ACC RELAY, PWR POINT RELAY)

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU OR BATTERY - COWL SIDE J/B RH)

INSPECT POWER SOURCE CONTROL ECU

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

  1. Disconnect the 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 COWL SIDE JUNCTION BLOCK RH (ACC RELAY, PWR POINT RELAY)


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


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

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    RD-2 - RA-5 or RD-7
    		Always
    		68 to 250 Ω at 20°C (68°F)
    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


NG
Go to step 7
OK


5.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU OR BATTERY - COWL SIDE J/B RH)


  1. Measure the resistance of the wire harness side connector.


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

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

  1. Measure the voltage of the wire harness side connector.

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


NG
Go to step 8
OK


6.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 (Acc)

  1. Reconnect the connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    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)

7.REPLACE FAULTY 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 (Acc)

  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
    J55-11 (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

END

8.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 (Acc)

  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
    J55-11 (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

END