This error may be signalled if there is an open circuit or short circuit (positive or earth) for the wiring or the brake lights switch, if the pressure sensor, the reading circuit or the brake lights switch is damaged, if the sensor does not receive the correct power supply or if the brake lights switch is not correctly calibrated

		Test results
1	ELECTRICAL CHECKS	All OK	Problems encountered	Operation
	Check that the electrical connections for the brake lights circuit are correct. Check the continuity of the wiring between the pressure sensor and control unit See E7023 ESP	Move on to Step 2	Wiring faulty	Restore the correct wiring.
2	BRAKE PEDAL STATUS CHECK	All OK	Problems encountered	Operation
	Connect the diagnostic equipment and, in the "PARAMETERS" mode, check the "BRAKE PEDAL STATUS" parameter. Press the brake pedal and read "PRESSED". Release the brake pedal and read "RELEASED"	Move on to Step 4	Incorrect reading	Move on to Step 3
3	BRAKE PEDAL SWITCH CHECK	All OK	Problems encountered	Operation
	Check the condition of the brake pedal switch See Test 5550DA BRAKE PEDAL SWITCH OPERATION CHECK	Move on to Step 4	Switch faulty	Replace the brake pedal switch Op. 5550D10 BRAKE LIGHT SWITCH - R+R
4	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Delete the errors using the diagnostic equipment. Road test See Test 3350EA ESP SYSTEM INTERVENTION CHECK to ensure that the control unit checks whether the errors are still present. Return to the workshop and check that the fault is no longer present using the diagnostic equipment	End of diagnosis	The fault persists	Replace the ABS electrohydraulic control unit Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R.