Circuit Description

WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

For circuit diagram, see Fig 1.

DTC Detecting Condition - B2785/99: Short circuit in IG switch circuit and/or IG switch adheres to ON position. B2786/99: Open circuit in IG switch circuit and/or IG adheres to OFF position.
Trouble Area - Ignition switch, EFI main relay or wiring harness.

Fig 1: Identifying Ignition Switch ON Malfunction & Ignition Switch OFF Malfunction Circuit (DTC B2785 & B2786)