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.

CHECK FOR DTC S

Clear the DTC s (See DTC CHECK / CLEAR )
Recheck for DTC.

Proceed to the next step based on the inspection result.

Result

RESULT REFERENCE

Result	Proceed to
DTC output does not occur	A
Multiplex communication system DTC output occurs	B
CAN communication system DTC output occurs	C
Airbag system DTC output occurs	D
Occupant classification system DTC output occurs	E

B: GO TO MULTIPLEX COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (See DIAGNOSTIC TROUBLE CODE CHART )

C: GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (See FAIL-SAFE CHART )

D: GO TO AIRBAG SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (See DIAGNOSTIC TROUBLE CODE CHART )

E: GO TO OCCUPANT CLASSIFICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (See DIAGNOSTIC TROUBLE CODE CHART )

A: Go to next Step

INSPECT FUSE (ECU-IG RH)

Remove the ECU-IG RH fuse from the main body ECU RH (cowl side junction block RH)

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

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
ECU-IG RH fuse	Always	Below 1 Ω

NG: REPLACE FUSE

OK: Go to next Step

PERFORM ACTIVE TEST USING TECHSTREAM

Operate the Techstream according to the steps on the display and select "Active Test".

Combination Meter

COMBINATION METER REFERENCE

Tester Display	Test Part	Control Range	Diagnostic Note
Front Passenger Side Seat Belt Remind	Passenger seat belt warning light	ON or OFF	-

Result

RESULT REFERENCE

Result	Proceed to
Passenger seat belt warning light condition cannot be switched by "Active Test" (w/o Navigation system)	A
Passenger seat belt warning light condition cannot be switched by "Active Test" (w/ Navigation system)	B
Passenger seat belt warning light condition can be switched by "Active Test"	C

B: Go to step 6

C: Go to step 8

A: Go to next Step

CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL AND PANEL ASSEMBLY - COMBINATION METER)

Disconnect the J54 integration control and panel assembly connector
Disconnect the J35 combination meter connector

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

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
J54-13 (PBEW) - J35-3 (PBLT)	Always	Below 1 Ω.
J54-8 (E) - Body ground	Always	Below 1 Ω
J54-13 (PBEW) or J35-3 (PBLT) - Body ground	Always	10 kΩ or higher

Standard Voltage

STANDARD VOLTAGE

Tester Connection	Switch Condition	Specified Condition
J54-4 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V

Fig 1: Identifying J54 Integration Control And Panel Assembly Connector And J35 Combination Meter Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next Step

CHECK INTEGRATION CONTROL AND PANEL ASSEMBLY

Remove the integration control and panel assembly with the connector still connected (See REMOVAL ).

Apply battery voltage from the wire harness back side between the terminals of the indicator, and check the lighting condition of the front passenger side seat belt warning light

Standard

STANDARD REFERENCE

Measurement Condition	Specified Condition
Battery position (+) → Terminal J54-4 (IG+) Battery position (-) → Terminal J54-13 (PBEW)	Front passenger side seat belt light comes on

Fig 2: Identifying J54 Integration Control And Panel Assembly Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY (See REMOVAL )

OK: REPLACE COMBINATION METER (See REMOVAL )

CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER)

Disconnect the J53 clock assembly connector.
Disconnect the J35 combination meter connector.

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

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
J53-8 (PBEW) - J35-3 (PBLT)	Always	Below 1 Ω
J53-2 (E) - Body ground	Always	Below 1 Ω
J53-8 (PBEW) - Body ground	Always	10 kΩ or higher
J35-3 (PBLT) - Body ground	Always	10 kΩ or higher

Standard Voltage

STANDARD VOLTAGE

Tester Connection	Switch Condition	Specified Condition
J53-11 (IG+) - Body ground	Engine switch on (IG)	11 to 14 V

Fig 3: Identifying J53 Clock Assembly Connector And J35 Combination Meter Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next Step

CHECK CLOCK ASSEMBLY

Remove the clock assembly with the connector still connected (See REMOVAL ).

Apply battery voltage from the wire harness back side between the terminals of the indicator, and check the lighting condition of the front passenger side seat belt warning light

Standard

STANDARD REFERENCE

Measurement Condition	Specified Condition
Battery position (+) → Terminal J53-11 (IG+) Battery position (-) → Terminal J53-8 (PBEW)	Front passenger side seat belt light comes on

Fig 4: Identifying J53 Clock Assembly Connector

NG: REPLACE CLOCK ASSEMBLY (See REMOVAL )

OK: REPLACE COMBINATION METER (See REMOVAL )

REPLACE GATEWAY ECU
1. Replace the gateway ECU (See NETWORK GATEWAY ECU )
CHECK PASSENGER SEAT BELT WARNING LIGHT
1. Check that the passenger seat belt warning light operates normally (see ON-VEHICLE INSPECTION )
  OK: The front passenger seat belt warning light normally operates.
NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY (See REMOVAL )

OK: END