199000848 - K072 HANDBRAKE APPLIED WARNING LIGHT

The warning light is on constantly even with the handbrake released.
The command to switch on the handbrake warning light is sent by the switch on the lever to the Body Computer Node which makes it available on the B-CAN to the Instrument Panel Node.
Results of the tests
0PRELIMINARY CHECKSAll OKProblems encounteredOperation
Check that the ABS warning light comes on and goes out during the initial testMove on to Step 1The ABS warning light also remains onContinue as indicated    See table K062 ABS AND HANDBRAKE WARNING LIGHTS BOTH ON
1ELECTRICAL SYSTEM CHECKAll OKProblems encounteredOperation
Check the insulation to earth of the wiring between the Handbrake lever switch and the Body ComputerMove on to Step 2Wiring not insulatedRestore the correct wiring    See E4010 INSTRUMENT PANEL
2SWITCH CHECKAll OKProblems encounteredOperation
Check the condition of the switch on the handbrake leverMove on to Step 3Switch defectiveReplace the switch    Op. 5550D18 HANDBRAKE ON WARNING LIGHT SWITCH - R+R
3ACTIVE DIAGNOSIS CHECKAll OKProblems encounteredOperation
With the Examiner in the Instrument Panel Node ambient check that the handbrake warning light is correctly activated in Active Diagnosis.Move on to Step 51. The handbrake warning light does not flash2. Impossible to connect with the Instrument Panel Node3. Presence of errors1. Replace the Instrument Panel2. Move on to Step 43. Continue by following the instructions on the diagnostic instrument
4ELECTRICAL POWER SUPPLY CHECKAll OKProblems encounteredOperation
Check the electricity supply to the Instrument Panel Node is correct.Move on to Step 5Fault in positive electrical supply and/or earthReplace defective component (in the case of a fuse, find out what caused it to blow)
5CHECK ELECTRICAL CONNECTIONSAll OKProblems encounteredOperation
Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected.Move on to Step 6Electrical connections not operationalRenew the damaged electrical connections
6CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Using the Examiner check, in the Body Computer ambient, that there are no errors and that the parameter specified variesEnd of diagnosis1. Impossible to connect to the Body Computer control unit.2. Presence of errors3. The parameters do not change1. Move on to Step 72. Continue by following the instructions on the diagnostic instrument3. Move on to Step 8
7ELECTRICAL POWER SUPPLY CHECKAll OKProblems encounteredOperation
Check the electricity supply to the Body Computer Node is correct.Move on to Step 8Fault in positive electrical supply and/or earthReplace defective component (in the case of a fuse, find out what caused it to blow).
8CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Use an Examiner to check the possibility of connection to the Body Computer NodeEnd of diagnosisImpossible to connect to the Body Computer control unit.Replace Body Computer    Op. 5505A32 BODY COMPUTER - R.R