2398851 - K100 MIL WARNING LIGHT DOES NOT WORK

With key on, the MIL warning light does not come on;
The MIL warning light is turned on via a direct earth control supplied by the engine control node. When everything is working normall, the MIL warning light should come on with the ignition on and go out once the engine has started;
Results of the tests
1CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment to the diagnostic socket and check the operation of the MIL warning light at the engine management node through active diagnosis.Continue to Step 5The warning light does not come onContinue to Step 2
2CHECKING WARNING LIGHT OPERATIONAll OKProblems metOperation
Check that the MIL warning light is working See   E4010  INSTRUMENT PANEL Continue to Step 5The warning light does not come onContinue to Step 3
3CHECKING ELECTRICAL EQUIPMENTAll OKProblems metOperation
Check the continuity and the insulation of the wires between the engine control node and the instrument panel node. See   E4010  INSTRUMENT PANEL Continue to Step 4Cable broken Renew the electrical connections See   E4010  INSTRUMENT PANEL
4INSTRUMENT PANEL REPLACEMENTAll OKProblems metOperation
Replace instrument panel Op. 5560B11End of diagnosis
5CHECK ON CORRECT OPERATIONAll OKProblems metOperation
1.2 16v 1.4 16vCheck that the fault is no longer present End of diagnosisFault persists Replace the engine management control unit Op.   1056B82 
1.3 JTD 16vCheck that the fault is no longer present End of diagnosisFault persists Replace the engine management control unit Op.   1060G80