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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 110 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0571: Brake Switch "A" Circuit >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Brake switch may also be referred to as stop light switch.

When brake pedal is depressed, stop light switch sends a signal to ECM. When ECM receives this signal, it cancels cruise control. A fail-safe function is provided so cruise control is cancelled normally when there is a malfunction in stop light signal circuit. Cancellation occurs when battery positive voltage is applied to terminal STP or ST1-. When brake is on, battery positive voltage is applied to terminal STP and ST1- of ECM via stop fuse and stop light switch. Then, ECM turns cruise control off. Even if harness connected to terminal STP or ST1- has an open circuit, cruise control will be turned off. DTC will set when stop light switch does not turn off even once vehicle is driven. Possible causes are:

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