Lexus IS250 IS220d GSE20 ALE20 - SEAT BELT

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

CHECK WIRE HARNESS (INTEGRATION CONTROL & PANEL +B)

CHECK INTEGRATION CONTROL & PANEL

CHECK WIRE HARNESS (INTEGRATION CONTROL & PANEL - COMBINATION METER ASSEMBLY)

CHECK WIRE HARNESS (MULTI-MEDIA MODULE DISPLAY +B)

CHECK MULTI-MEDIA MODULE DISPLAY

CHECK WIRE HARNESS (MULTI-MEDIA MODULE DISPLAY - COMBINATION METER ASSEMBLY)

INSPECT SEPARATE TYPE FRONT SEAT CUSHION COVER (OCCUPANT DETECTION SENSOR)

CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - FRONT SEAT INNER BELT RH)

REPLACE FRONT SEAT INNER BELT ASSEMBLY (PASSENGER SIDE)

SEAT BELT WARNING SYSTEM - Front Passenger Side Seat Belt Warning Light Malfunction

DESCRIPTION

with Navigation System:


The combination meter assembly detects the state of the front seat inner belt assembly RH when the front passenger seat is occupied with the engine switch on (IG). If the front passenger seat belt is not fastened, the front seat belt warning light on the multi-media module display blinks. If the seat belt is fastened, the warning light goes off.


without Navigation System:


The combination meter assembly detects the state of the front seat inner belt assembly RH when the front passenger seat is occupied with the engine switch on (IG). If the front passenger seat belt is not fastened, the front seat belt warning light on the integration control & panel assembly blinks. If the seat belt is fastened, the warning light goes off.


WIRING DIAGRAM

Seat Belt Warning System - Front Passenger Side Seat Belt Warning Light Malfunction. SEAT BELT. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Operate the intelligent tester according to the steps on the display and select "ACTIVE TEST".

  • METER:
  • ItemTest DetailsDiagnostic Note
    Indicat. lamp P-seat BeltP-SEAT BELT indicator light (OFF/ON)Confirm that the vehicle is stopped with the engine idling
  • Result:
  • OK (without Navigation System)A
    OK (with Navigation System)B
    NGC
  • OK:
  • Switch condition (ON/OFF) can be switched by "ACTIVE TEST".
B
Go to step 5
C
Go to step 8
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
5.CHECK WIRE HARNESS (MULTI-MEDIA MODULE DISPLAY +B)
Seat Belt Warning System - Front Passenger Side Seat Belt Warning Light Malfunction. SEAT BELT. Lexus IS250 IS220d GSE20 ALE20

Disconnect the multi-media module display connector.

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

  • Voltage:
  • Tester ConnectionConditionSpecified Condition
    J50-3 (IG+) - Body groundEngine switch on (IG)10 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
6.CHECK MULTI-MEDIA MODULE DISPLAY
Seat Belt Warning System - Front Passenger Side Seat Belt Warning Light Malfunction. SEAT BELT. Lexus IS250 IS220d GSE20 ALE20

Disconnect the multi-media module display connector.

Apply battery voltage to the connector according to the table below.

  • Voltage:
  • ConditionSpecified Condition
    Battery positive (+) → Terminal 3 (IG)
    Battery negative (-) → Terminal 21(PBEW)    		Lights up (Seat belt warning light)
NG
REPLACE MULTI-MEDIA MODULE DISPLAY
OK
7.CHECK WIRE HARNESS (MULTI-MEDIA MODULE DISPLAY - COMBINATION METER ASSEMBLY)
Seat Belt Warning System - Front Passenger Side Seat Belt Warning Light Malfunction. SEAT BELT. Lexus IS250 IS220d GSE20 ALE20

Disconnect the combination meter assembly and multi-media module display connectors.

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

  • Resistance:
  • Tester ConnectionConditionSpecified Condition
    J35-3 (PBLT) - J50-21 (PBEW)AlwaysBelow 1 Ω
    J35-3 (PBLT) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
8.INSPECT SEPARATE TYPE FRONT SEAT CUSHION COVER (OCCUPANT DETECTION SENSOR)
Seat Belt Warning System - Front Passenger Side Seat Belt Warning Light Malfunction. SEAT BELT. Lexus IS250 IS220d GSE20 ALE20

Disconnect the occupant detection sensor connector.

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

  • Resistance:
  • Tester ConnectionConditionSpecified Condition
    A-1 - A-3The passenger seat is occupiedBelow 100 Ω
    A-1 - A-3The passenger seat is not occupiedBelow 1 MΩ
NG
REPLACE SEPARATE TYPE FRONT SEAT CUSHION COVER (OCCUPANT DETECTION SENSOR)
OK
9.CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - FRONT SEAT INNER BELT RH)

Disconnect the front seat inner belt RH connector.

Seat Belt Warning System - Front Passenger Side Seat Belt Warning Light Malfunction. SEAT BELT. Lexus IS250 IS220d GSE20 ALE20

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

  • Resistance:
  • Tester ConnectionConditionSpecified Condition
    J35-4 (P/SB) - T3-1 (WS+)AlwaysBelow 1 Ω
    J35-4 (E) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
10.REPLACE FRONT SEAT INNER BELT ASSEMBLY (PASSENGER SIDE)

Replace the front seat inner belt assembly (Passenger side).

  • OK:
  • Seat belt warning operation returns to normal.
NG
REPLACE COMBINATION METER
OK
END
LEXUS IS250, IS220d / GSE20 ALE20
SEAT BELT
Lexus IS250 IS220d GSE20 ALE20
SEAT BELT WARNING SYSTEM