Engine Control System

DTC P0504 Brake Switch "A" / "B" Correlation
DTC P0571 Brake Switch "A" Circuit

DESCRIPTION

DTC Detection Conditions:

In addition to turning on the stop lights, the stop light switch signals are used for a variety of engine, transmission and suspension functions. The stop light switch is designed with 2 complementary signal outputs, STP and ST1-. The ECM analyzes these signal outputs to detect malfunctions in the stop light switch.

HINT: Normal condition is as shown in the table below. The signals can be read using the intelligent tester.

Wiring Diagram:

Step 1-2:

Step 3-4:

INSPECTION PROCEDURE