184000538 - 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
0PRELIMINARY CHECKSAll OKProblems metOperation
Check that the ABS warning light comes on and goes out properly during the initial testContinue to Step 1The ABS warning light remains onContinue as instructed See table K62 ABS AND HANDBRAKE WARNING LIGHTS BOTH ON
1CHECKING ELECTRICAL EQUIPMENTAll OKProblems metOperation
Check the earth insulation of the wiring between Parking Brake lever switch and Body Computer.Continue to Step 2Wiring not insulatedRenew the wiring See E4010 INSTRUMENT PANEL
2SWITCH CHECKAll OKProblems metOperation
Check the condition of the switch on the parking brake leverContinue to Step 3Faulty switchReplace switch Op. 5550D18
3CHECK WITH ACTIVE DIAGNOSISAll OKProblems metOperation
With the Examiner in the Instrument Panel Node ambient, check, in active diagnosis, that the handbrake warning light is correctly activatedContinue to Step 6The handbrake warning light does not flashReplace the instrument panel Op. 5560B11
Impossible to connect with the Instrument Panel NodeContinue to Step 4
4CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and the following parameters are presentContinue to Step 5There are errorsContinue in accordance with the instructions for the diagnostic equipment
5ELECTRICAL POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Instrument Panel Node electrical power supply is correctContinue to Step 3Positive and/or earth electrical power supply faultyReplace the component involved (if a fuse is involved, search for the cause of the problem)
6CHECK ELECTRICAL CONNECTIONSAll OKProblems metOperation
Check the electrical connections between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connectedContinue to Step 7Electrical connections not workingRestore damaged electrical connections
7CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check, in the Body Computer Node ambient, that there are no errors and the specific parameter variesContinue to Step 10Impossible to connect with the Body Computer control unitContinue to Step 8
There are errorsContinue in accordance with the instructions for the diagnostic equipment
The parameter values do not changeContinue to Step 10
8ELECTRICAL POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Body Computer Node electrical power supply is correctContinue to Step 9Positive and/or earth electrical power supply faultyReplace the component involved (if a fuse is involved, search for the cause of the problem)
9CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check the possibility of connecting with the Body Computer NodeContinue to Step 7Impossible to connect with the Body Computer control unitReplace the Body Computer Op. 5505A32
10CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persistsReplace the Body Computer Op. 5505A32