Theft Deterrent System (W/O Intrusion Sensor) - Engine Hood Courtesy Switch Circuit

Lexus IS250 IS220d GSE20 ALE20 - THEFT DETERRENT

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT DTC

READ VALUE OF INTELLIGENT TESTER

INSPECT ENGINE HOOD COURTESY SWITCH

CHECK HARNESS AND CONNECTOR (ENGINE ROOM R/B NO. 2 - ENGINE HOOD COURTESY SWITCH)

CHECK HARNESS AND CONNECTOR (ENGINE HOOD COURTESY SWITCH - BODY GROUND)

THEFT DETERRENT SYSTEM (w/o Intrusion Sensor) - Engine Hood Courtesy Switch Circuit

DESCRIPTION

The engine hood courtesy switch is installed together with the hood lock. This switch turns on when the engine hood is opened and turns off when the engine hood is closed.


WIRING DIAGRAM

Theft Deterrent System (W/O Intrusion Sensor) - Engine Hood Courtesy Switch Circuit. THEFT DETERRENT. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.INSPECT DTC
  • HINT:
  • Front controller sends engine hood open/close signal to main body ECU RH through the multiplex communication.

Delete DTC .

Check the DTC B1214.

  • OK:
  • No DTC is output.
NG
Go to step 3
OK
REPLACE ENGINE ROOM NO. 2 RELAY BLOCK AND JUNCTION BLOCK (FRONT CONTROLLER)
3.INSPECT ENGINE HOOD COURTESY SWITCH
Theft Deterrent System (W/O Intrusion Sensor) - Engine Hood Courtesy Switch Circuit. THEFT DETERRENT. Lexus IS250 IS220d GSE20 ALE20

Remove the courtesy switch from the hood lock.

Disconnect the 2G R/B connector.

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

  • Standard resistance:
  • Tester ConnectionSwitch PositionSpecified Condition
    1 - 2Free (OFF)10 kΩ or higher
    Pushed (ON)Below 1 Ω
NG
REPLACE HOOD LOCK ASSEMBLY
OK
4.CHECK HARNESS AND CONNECTOR (ENGINE ROOM R/B NO. 2 - ENGINE HOOD COURTESY SWITCH)
Theft Deterrent System (W/O Intrusion Sensor) - Engine Hood Courtesy Switch Circuit. THEFT DETERRENT. Lexus IS250 IS220d GSE20 ALE20

Disconnect the 2G R/B connector and B8 switch connector.

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

  • Standard resistance:
  • Tester ConnectionSpecified Condition
    2G-3 - B8-2Below 1 Ω
    2G-3 or B8-2 - Body ground10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
5.CHECK HARNESS AND CONNECTOR (ENGINE HOOD COURTESY SWITCH - BODY GROUND)
Theft Deterrent System (W/O Intrusion Sensor) - Engine Hood Courtesy Switch Circuit. THEFT DETERRENT. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard resistance:
  • Tester ConnectionSpecified Condition
    B8-1 - Body groundBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE