Circuit Description

WARNING: This page is about a different car, the 2006 Toyota 4Runner. 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 front RH seat 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".

DTC TABLE

DTC No.	DTC Detecting Condition	Trouble Area
B1785	Seat adjuster frame assy malfunction Occupant classification ECU malfunction Occupant classification sensor front LH senses a large load	Front RH seat assy (Occupant classification sensor front LH) Occupant classification ECU

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.