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

Lexus IS250 IS220d GSE20 ALE20 4GR-FSE STARTING

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

Entry And Start System - Power Source Mode Does Not Change To On (Acc). 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.INSPECT FUSE (AM2)

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

Measure the resistance of the fuse.

  • Standard resistance:
  • Below 1 Ω
NG
Go to step 7
OK
5.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU OR BATTERY - COWL SIDE J/B RH)

Measure the resistance of the wire harness side connector.

Entry And Start System - Power Source Mode Does Not Change To On (Acc). 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-11 (ACCD) - RD-2AlwaysBelow 1 Ω
    J55-11 (ACCD) - Body groundAlways10 kΩ or higher
    RA-5 - Body groundAlwaysBelow 1 Ω
    RD-7 - Body groundAlwaysBelow 1 Ω

Measure the voltage of the wire harness side connector.

  • Standard voltage:
  • Tester ConnectionConditionSpecified Condition
    RM-1 - Body groundAlways10 to 14 V
NG
Go to step 8
OK
6.INSPECT POWER SOURCE CONTROL ECU
Entry And Start System - Power Source Mode Does Not Change To On (Acc). 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

Reconnect the connector.

Measure the voltage of the wire harness side connector.

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-11 (ACCD) - Body groundEngine switch offBelow 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
Entry And Start System - Power Source Mode Does Not Change To On (Acc). 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

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

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-11 (ACCD) - Body groundEngine switch offBelow 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
Entry And Start System - Power Source Mode Does Not Change To On (Acc). 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

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

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-11 (ACCD) - Body groundEngine switch offBelow 1 V
    Engine switch on (ACC)Output voltage at terminal AM2 is -2 V or more.
NG
REPLACE POWER SOURCE CONTROL ECU
OK
END