April 5, 2026: LEMON Manuals is launched! Read the announcement.

Possible Causes

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

For DTC detection conditions and possible causes, see Fig 1.

Fig 1: Brake Switch "A"/"B" Circuit Wiring Diagram & DTC Detection Conditions & Possible Causes