323000838 - K141 MODE BUTTON NOT WORKING

The Instrument Panel Node receives information directly from the keypad "Mode", "+" and "-" keys.
TEST RESULTS
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Connect the Examiner diagnostic equipment and check, in Instrument Panel Node mode, that there are no errors and that the parameters are present.Move on to Step 31. Impossible to connect to the Instrument Panel Node.2. Presence of errors.1. Move on to Step 22. Continue as instructed by the diagnostic equipment
2ELECTRICAL POWER SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the electricity supply to the Instrument Panel Node is correct.    See E4010 INSTRUMENT PANEL Move on to Step 3Fault in positive electrical supply and/or earth.Renew and/or replace the defective component (in the case of a fuse, find out what caused it to blow).
3ELECTRICAL CONNECTIONS CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the correct operation of the following components:- Wiring between instrument panel and control panel    See E4010 INSTRUMENT PANEL Also check that the control panel is working correctly.End of diagnosis1.Electrical wiring and/or connections not operational.2.MODE keypad defective1.Restore damaged wiring and/or electrical connections.2.Replace the control panel    Op. 7040A82 SWITCH UNIT ON LEFT SIDE OF DASHBOARD - R.R.