Lexus IS250 · Service Manual BODY ELECTRICAL

Luggage Compartment Door Open Switch Circuit

Circuit diagnosis

DESCRIPTION

If the certification ECU detects that the luggage compartment open switch is pressed when the driver is carrying the electrical key or when the electrical key is locked in the luggage compartment door, the certification ECU sends a luggage compartment door open motor drive request signal to the main body ECU LH.

WIRING DIAGRAM

B112474E01

INSPECTION PROCEDURE


1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - LUGGAGE COMPARTMENT OPENER SWITCH)

  1. B128438E02
    Disconnect the Q3 ECU connector.

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

    Standard resistance:
    Tester Connection (Symbols)
    Condition
    Specified Condition
    LPSW (Q3-13) - Body ground
    Luggage compartment open switch not pushed
    10 kΩ or higher
    Luggage compartment open switch pushed
    Below 1 Ω



OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG


2. INSPECT LUGGAGE COMPARTMENT OPENER SWITCH

  1. B112503E01
    Disconnect the switch connector.

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

    Standard resistance:
    Tester connection
    Condition
    Specified condition
    Q45-1 - Q45-2
    Luggage compartment open switch not pushed (OFF)
    10 kΩ or higher
    Luggage compartment open switch pushed (ON)
    Below 1 Ω



NG
REPLACE LUGGAGE COMPARTMENT OPENER SWITCH
OK

REPLACE MAIN BODY ECU LH


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