Circuit Description

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1785 is output when the occupant classification ECU receives a collision detection signal sent by the occupant classification sensor front LH if an accident occurs.

DTC B1785 is also output when the seat adjuster frame assy is subjected to a strong impact, even if an actual accident does not occur.

However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1785 can be cleared by "Zero point calibration" and "Sensitivity check".

Therefore, if DTC B1785 is output, first perform "Zero point calibration" and "Sensitivity check".

Fig 1: DTC B1785 Detection Condition & Trouble Area Table

HINT:

When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system, perform troubleshooting for DTC B1785 of the occupant classification system.