Lexus IS250 · Service Manual RESTRAINTS

B2063

Diagnostic trouble codes

DESCRIPTION

  1. This circuit consists of the front seat inner belt assembly (driver side), front seat inner belt assembly passenger side), center airbag sensor assembly and seat belt control ECU.
  2. When the driver side seat belt is fastened to the front seat inner belt assembly (driver side), the center airbag sensor assembly detects malfunctions in the circuit.
  3. When the passenger side seat belt is fastened to the front seat inner belt assembly (passenger side), the seat belt control ECU detects malfunctions in the circuit.
  4. The center airbag sensor assembly sends information about the seat belt fastened/unfastened condition and circuit malfunctions through CAN communication to the seat belt control ECU.
  5. The seat belt control ECU uses information from the center airbag sensor assembly to control the pre-crash safety system.
DTC No.
 DTC Detection Condition
 Trouble Area
B2063
  1. Open, short, +B short or body ground short between terminals of center airbag sensor assembly and front seat inner belt assembly LH
  2. Open, short, +B short or body ground short between terminals of seat belt control ECU and front seat inner belt assembly RH
  1. Front seat inner belt assembly RH
  2. Front seat inner belt assembly LH
  3. Center airbag sensor assembly
  4. Seat belt control ECU

WIRING DIAGRAM

B124184E02

INSPECTION PROCEDURE

NOTICE:
When the seat belt control ECU is replaced with a new one, INITIALIZATION must be performed (Click here).


1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

  1. Delete the DTC (Click here).

  1. Check that DTC U0151 is not output.

    OK:
    DTC U0151 is not output.



 NG
GO TO CAN COMMUNICATION SYSTEM
OK


2. CHECK DTC OUTPUT (SUPPLEMENTAL RESTRAINT SYSTEM)

  1. Delete the DTC (Click here).

  1. Check that DTC B1655 is not output.

    OK:
    DTC B1655 is not output.



 NG
GO TO SUPPLEMENTAL RESTRAINT SYSTEM
OK


3. READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and the turn the intelligent tester main switch on.

  1. Select P Bk SW in the Data List and read the value displayed on the intelligent tester.

    Item
    		 Measurement Item/Range (Display)
    		 Normal Condition
    		 Diagnostic Note
    P Bk SW
    		 Buckle switch status of passenger's seat/
    UNSET: Passenger side seat belt is unfastened
    SET: Passenger side seat belt is fastened
    NG: Indeterminate date
    		 UNSET / SET
    		 -

    OK:
    SET (Passenger side seat belt is fastened) appears on the tester.



 OK
REPLACE SEAT BELT CONTROL ECU
NG


4. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - FRONT SEAT BELT ASSEMBLY)

  1. B124167E01
    Disconnect the negative (-) battery terminal and wait at least 90 seconds.

HINT:
Make sure that the engine switch is off before disconnecting the cable.

  1. Disconnect the P4 (LHD) or O6 (RHD) belt and O38 ECU connectors.

  1. Using a service wire, connect terminals PBK+ and PBK- of connector P4.

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

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    O38-14 (PBK+) - O38-12 (PBK-)
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - FRONT SEAT INNER BELT ASSEMBLY)

  1. B124168E01
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    O38-14 (PBK+) - Body ground
    		 Always
    		 1kΩ or higher
    O38-12 (PBK-) - Body ground
    		 Always
    		 1kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - FRONT SEAT INNER BELT ASSEMBLY)

  1. B124168E01
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		 Condition
    		 Specified Condition
    O38-14 (PBK+) - O38-12 (PBK-)
    		 Always
    		 1 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - FRONT SEAT INNER BELT ASSEMBLY)

  1. Connect the negative (-) battery terminal, and turn the engine switch on (IG).

  1. B124168E01
    Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection
    		 Condition
    		 Specified Condition
    O38-14 (PBK+) - Body ground
    		 Always
    		 Below 1 V
    O38-12 (PBK-) - Body ground
    		 Always
    		 Below 1 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8. CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

  1. Disconnect the negative (-) battery terminal and wait at least 90 seconds.

  1. Connect the connectors from the seat belt control ECU and front seat inner belt assembly (passenger side).

  1. Connect the cable to the negative (-) battery terminal and turn the engine switch on (IG). Then wait 60 seconds.

  1. Delete the DTC (Click here).

  1. Recheck for DTC.

    OK:
    DTC B2063 is not output.



 OK
USE SIMULATION METHOD TO CHECK
NG


9. REPLACE FRONT SEAT INNER BELT ASSEMBLY (PASSENGER SIDE)

  1. Disconnect the negative (-) battery terminal and wait at least 90 seconds.

  1. Replace the front seat inner belt assembly of passenger side (Click here).


NEXT


10. CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

  1. Connect the negative (-) battery terminal and turn the engine switch on (IG). Then wait 60 seconds.

  1. Delete the DTC (Click here).

  1. Recheck for DTC.

    OK:
    DTC B2063 is not output.



 NG
REPLACE SEAT BELT CONTROL ECU
OK

END


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