(PD) Response Code 1-2-4

PD. 1-2-4 Disconnected Stop (brake) Light Circuit

Response code information
Response code 1-2-4 is posted if the cruise control system is disengaged by the brake pedal being pressed and activating the stop light switch. If this did not occur during the test drive, terminal 6B was not connected to the body through the stop lights at the moment of disengagement.

If the code was posted without disconnection of the cruise control system by the brake pedal being pressed and activating the brake light switch:
Fault trace according to LE. Response code 1-3-2 Stop (brake) light switch.(L) Diagnostic Test Mode (DTM) 2, Component Test