169000587 - Z77 WARNING LIGHTS CONTROL LINE ERROR

The diagnostic equipment signals the following error: "C1108 - Warning light serial line"
this error is indicated if the control unit cannot communicate with the instrument panel
1CHECK PANEL INITIAL CHECKAll OKProblems encounteredOperation
Turn the key ON and check that the instrument panel carries out the initial check on the warning lightsMove on to Step 3 1Failure to carry out the initial checkMove on to Step 2 1
3ELECTRICAL CONNECTION CHECKAll OKProblems encounteredOperation
Check the electrical continuity of the serial line between the ABS control unit and the body computer See E7023 ESP Move on to Step 4 1Electrical continuity failure between the ABS control unit and the body computerRestore the correct connection and move on to Step 4
4CHECK ON CORRECT OPERATIONAll OKProblems encounteredOperation
Clear the errors using the ExaminerTurn the key OFF and then ON to ensure that the control unit checks whether the errors are still present.Check that the fault is no longer presentEnd of diagnosisThe fault persistsMove on to Step 1