PROCEDURE
(a) Check that conditions in the cabin are not likely to cause condensation. HINT: This problem occurs when the cabin is humid and the temperature changes rapidly. This may produce condensation, resulting in a short circuit. OK: Condensation is not likely to be produced.
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Toyota Tundra Service Manual > Cruise Control System: Brake Switch "A" Circuit (P0571)
DESCRIPTION When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. Upon receiving the signal, the ECM cancels the cruise control system. DTC No. Detection Item DTC Detection Condition Trouble Area P0571 Brake Switch "A" Circuit When voltage of STP terminal and t ...