LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2005 >> Prius >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Push Button Start System - Diagnostics >> DTC B2278: Main Switch (Power Switch) Malfunction >> Circuit Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit Description

This DTC is output when 1) a malfunction is detected between the power source control ECU and the power switch; or 2) either of the switches inside the power switch is malfunctioning.

Fig 1: DTC B2278 Main Switch (Power Switch) Malfunction - DTC Detection Condition
G02617856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals