LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> IS 250 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Supplemental Restraint System) >> Occupant Classification System >> Diagnostic Trouble Code Chart
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Chart

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.

HINT

When DTC B1650/32 is detected as a result of troubleshooting for the airbag system, perform troubleshooting for the occupant classification system as shown in the chart below

Occupant Classification System 

DIAGNOSTIC TROUBLE CODE CHART

DTC Code Detection Item Trouble Area Passenger Airbag ON/OFF Indicator (OFF Indicator)
B1771  Passenger Side Buckle Switch Circuit Malfunction
  1. Front seat wire RH
  2. Front seat inner belt assembly RH (Passenger side buckle switch)
  3. Occupant classification ECU
 ON
B1773  Belt Tension Sensor Circuit Malfunction
  1. Floor wire
  2. Front seat wire RH
  3. Front seat outer belt assembly RH (Seat belt tension sensor)
  4. Occupant classification ECU
 ON
B1774  Pressure Sensor Circuit Malfunction
  1. Front seat wire RH
  2. Occupant classification sensor
  3. Occupant classification ECU
 ON
B1775  Pressure Sensor Power Source Circuit Malfunction
  1. Front seat wire RH
  2. Occupant classification sensor
  3. Occupant classification ECU
 ON
B1776  Seat Belt Tension Sensor Power Source Circuit Malfunction
  1. Floor wire
  2. Front seat wire RH
  3. Front seat outer belt assembly RH (Seat belt tension sensor)
  4. Occupant classification ECU
 ON
B1790  Center Airbag Sensor Assembly Communication Circuit Malfunction
  1. Floor wire
  2. Front seat wire RH
  3. Occupant classification ECU
  4. Center airbag sensor assembly
 ON
B1795  Occupant Classification ECU Malfunction Occupant classification ECU ON
B1797  Calibration Malfunction
  1. There is no malfunction if this DTC is not output again after performing occupant classification system zero point calibration
  2. Occupant classification sensor
  3. Occupant classification ECU
 ON
scientia non olet · About LEMON Manuals