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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 269 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC B1785: Occupant Classification Left Front Sensor Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform occupant classification ECU zero point calibration. See step  1, Zero point calibration, under . If COMPLETE is displayed at end of zero point calibration, go to next step. If COMPLETE is not displayed at end of zero point calibration, go to step  4.
  2. Perform occupant classification ECU sensitivity check. See step 2 , Sensitivity check under . If sensitivity check is within standard, go to next step. If sensitivity check is not within standard, go to step  4.
  3. Turn ignition switch to ON position. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. Turn ignition switch to LOCK position. Turn ignition switch to ON position. Retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. If DTC B1785 is displayed, go to next step. If DTC B1785 is not displayed, test is complete.
  4. Turn ignition switch to LOCK position. Wait at least 90 seconds. Replace left front seat adjuster. See FRONT SEAT ADJUSTER FRAME  under REMOVAL & INSTALLATION. Perform occupant classification ECU zero point calibration. If COMPLETE is displayed at end of zero point calibration, go to next step. If COMPLETE is not displayed at end of zero point calibration, go to step  7.
  5. Perform occupant classification ECU sensitivity check. If sensitivity check is within standard, go to next step. If sensitivity check is not within standard, go to step  7.
  6. Connect occupant classification ECU and occupant classification left front sensor connectors, if necessary. Using Lexus hand-held tester, clear DTCs in occupant classification ECU. See CLEARING PASSENGER OCCUPANT CLASSIFICATION SYSTEM DTCS USING LEXUS HAND-HELD TESTER  under DIAGNOSTICS. Clear DTCs in air bag sensor assembly. Turn ignition switch to LOCK position. Turn ignition switch to ON position. Retrieve DTCs. If DTC B1785 is retrieved, go to next step. If DTC B1785 is not retrieved, test is complete.
  7. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. replace occupant classification ECU. See OCCUPANT CLASSIFICATION ELECTRONIC CONTROL UNIT (ECU)  under REMOVAL & INSTALLATION. Perform occupant classification ECU initialization. See OCCUPANT CLASSIFICATION ELECTRONIC CONTROL UNIT (ECU) INITIALIZATION PROCEDURE  under DIAGNOSTICS.
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