P0571/52 Brake Switch "A" Circuit

DTC P0571 BRAKE SWITCH "A" CIRCUIT

CIRCUIT DESCRIPTION

DTC Detection Condition:

When the brake pedal is depressed, the stop lamp switch assembly sends a signal to the ECM. When the ECM receives the signal, it cancels the cruise control.

Even if a malfunction occurs in the stop lamp signal circuit, a normal vehicle operation can be maintained by the fail-safe function.

The cancel condition occurs when positive battery voltage is supplied to terminal STP.

When the brake pedal is on, positive battery voltage is normally applied through the STOP fuse and the stop lamp switch assembly to terminal STP of the ECM, and then the ECM turns the cruise control OFF.

Wiring Diagram:

Step 1 - 3:

Step 3 (Continued):

INSPECTION PROCEDURE