Lexus IS250 · Service Manual RESTRAINTS

B2035

Diagnostic trouble codes

DESCRIPTION

The DTC is output during the power supply relay adherence malfunction in the seat belt control ECU.
DTC No.
 DTC Detection Condition
 Trouble Area
B2035
 Adherence in power supply relay
  1. Wire harness
  2. Seat belt control ECU

WIRING DIAGRAM

E107845E04

INSPECTION PROCEDURE

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


1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY RH

  1. G025196E05
    Disconnect the P8 connector of the front seat outer belt assembly RH.

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

    Standard voltage:
    Tester Connection
    		 Condition
    		 Specified Condition
    P8-1 - Body ground
    		 Engine switch on (IG)
    		 Below 1 V
    P8-2 - Body ground
    		 Engine switch on (IG)
    		 Below 1 V



NG
REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH
OK


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

  1. H045168E07
    Disconnect the negative (-) battery terminal .

  1. Disconnect the O38 connector of the seat belt control ECU.

  1. Connect the negative (-) terminal to the battery.

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

    Standard voltage:
    Tester Connection
    		 Condition
    		 Specified Condition
    P8-1 - Body ground
    		 Engine switch on (IG)
    		 Below 1 V
    P8-2 - Body ground
    		 Engine switch on (IG)
    		 Below 1 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. CHECK DTC OUTPUT

  1. Turn the engine switch on (IG).

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG).

  1. Check for the DTCs (Click here).

    OK:
    No DTC is output.



 NG
REPLACE SEAT BELT CONTROL ECU
OK

USE SIMULATION METHOD TO CHECK


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