Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When the seat belt control ECU is replaced with a new one, Initialization must be performed (See INITIALIZATION ).

INSPECT FRONT SEAT OUTER BELT ASSEMBLY LH

Disconnect the Q13 connector of the front seat outer belt assembly LH

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

Standard Voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
Q13-1 - Body ground	Engine switch on (IG)	Below 1 V
Q13-2-Body ground	Engine switch on (IG)	Below 1 V

Fig 1: Identifying Q13 Front Seat Outer Belt Connector Terminal

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NG: REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH (See REMOVAL )

OK: Go to next Step

CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - SEAT BELT CONTROL ECU)

Disconnect the cable from the negative (-) battery terminal.
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See INITIALIZATION ).
Disconnect the Q38 connector of the seat belt control ECU.
Connect the cable to the negative battery terminal

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

Standard Voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
Q13-1 - Body ground	Engine switch on (IG)	Below 1 V
Q13-2 - Body ground	Engine switch on (IG)	Below 1 V

Fig 2: Identifying Q13 Front Seat Outer Belt Connector Terminal

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE SEAT BELT CONTROL ECU (See SEAT BELT CONTROL ECU )