P0504

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

DESCRIPTION

DTC Detection Condition:

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. The signals can be read using the intelligent tester.

Wiring Diagram:

Step 1-2:

Step 3-4:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.