2427564 - K72 HANDBRAKE APPLIED WARNING LIGHT

The warning light stays on even when the handbrake is off.

A parking brake warning light activation command is sent by the switch on the lever to the Body Computer Node, which makes it available to the Instrument Panel Node via the B-CAN network

		Results of the tests
0	PRELIMINARY CHECKS	All OK	Problems met	Operation
	Check that the ABS warning light comes on and goes out properly during the initial test	Continue to Step 1	The ABS warning light remains on	Continue as instructed See table   K62  ABS AND HANDBRAKE WARNING LIGHTS BOTH ON
1	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the earth insulation of the wiring between Parking Brake lever switch and Body Computer.	Continue to Step 2	Wiring not isolated	Renew the wiring See   E4010  INSTRUMENT PANEL
2	SWITCH CHECK	All OK	Problems met	Operation
	Check the condition of the switch on the parking brake lever	Continue to Step 3	Faulty switch	Replace switch Op.   5550D18
3	CHECK WITH ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	With the Examiner in the Instrument Panel Node ambient, check, in active diagnosis, that the handbrake warning light is correctly activated	Continue to Step 6	The handbrake warning light does not flash	Replace the instrument panel Op. 5560B11
			Impossible to connect with the Instrument Panel Node	Continue to Step 4
4	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and the following parameters are present	Continue to Step 5	There are errors	Continue in accordance with the instructions for the diagnostic equipment
5	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the Instrument Panel Node electrical power supply is correct	Continue to Step 3	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
6	CHECK ELECTRICAL CONNECTIONS	All OK	Problems met	Operation
	Check the electrical connections between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected	Continue to Step 7	Electrical connections not working	Restore damaged electrical connections.
7	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check, in the Body Computer Node ambient, that there are no errors and the specific parameter varies	Continue to Step 10	Impossible to connect with the Body Computer control unit	Continue to Step 8
			There are errors	Continue in accordance with the instructions for the diagnostic equipment
			The parameter values do not change	Continue to Step 10
8	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the Body Computer Node electrical power supply is correct	Continue to Step 9	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
9	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check the possibility of connecting with the Body Computer Node	Continue to Step 7	Impossible to connect with the Body Computer control unit	Replace the Body Computer Op. 5505A32
10	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace the Body Computer Op. 5505A32