P0571
DTC P0571 Stop Light Switch Circuit MalfunctionDESCRIPTION
DTC Detected Conditions:
The cruise control system cancels cruising when the ECM detects that the brake pedal is depressed while cruise control driving. The stop light switch assembly sends signals to the ECM according to the brake pedal conditions. When the brake pedal is free, terminal ST1- is the positive (+) battery voltage, and terminal STP voltage is below 1 V. While depressing the brake pedal, terminal ST1- is below 1 V, and STP is positive (+) battery voltage. Under braking, the ECM cancels cruise control as one of the manual cancel functions.
The ECM outputs this trouble code when the voltage of terminals ST1- and STP are both below 1 V for 0.5 seconds or more at the same moment.
The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit.
Wiring Diagram:
INSPECTION PROCEDURE
Step 1:
Step 1(Continued)-3:
Step 3(Continued):
