PROCEDURE
(a) Check that the voice guidance settings are not off. OK: Voice guidance settings are not off.
(a) Check that sound can be heard from a front speaker. OK: Sound can be heard. Result
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Toyota Tundra Service Manual > Sfi System: Brake Switch "A" / "B" Correlation (P0504)
DESCRIPTION The 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 simultaneo ...