P0504 2006 TOYOTA CAMRY - Brake Switch Circuit 'A' / 'B' Correlation
- Faulty stop lamp switch
- Blown stop lamp bulb
- Brake switch harness open or shorted
- Brake switch circuit poor electrical connection
- STOP fuse
- IGN fuse
Tech notesCheck to see if the bulbs are good if they are good check the STOP fuse and IGN fuse, if they are good most likely the STOP light switch (near the brake pedal) is bad if there is no wiring issues.
- Engine Light ON (or Service Engine Soon Warning Light)
P0504 2006 Toyota Camry DescriptionThe stop light switch is a duplex system that transmits two signals: STP and ST1-. These two signals are used by the ECM to monitor whether or not the brake system is working properly. If the signals, which indicate the brake pedal is being depressed and released, are detected simultaneously, the ECM interprets this as a malfunction in the stop light switch and sets the DTC.
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