939003679 - K141 MODE BUTTON NOT WORKING

The "Instrument Panel Node" receives information directly from the "Mode", "+" and "-" keys.
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 61. Impossible to connect to the NQS1. Move on to Step 2
2. Presence of errors.2. Move on to Step 5
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 earthRenew and/or replace the defective component (in the case of a fuse, find out what caused it to blow).
3CHECK ELECTRICAL CONNECTIONSALL OKPROBLEMS ENCOUNTEREDACTION
Check the electrical wiring/connections of the instrument Panel Node and those between node and steering wheel stalk. Check, in particular, that each pin is correctly connected and inserted in its seat.Move on to Step 4Electrical wiring and/or connections not operating.Restore damaged wiring and/or electrical connections.
4CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Use an Examiner to check the possibility of connection to the Instrument Panel NodeMove on to Step 5Impossible to connect to the control unit.Replace the instrument panel    Op. 5560B10 CONTROL PANEL - R+R
5ELECTRICAL CIRCUIT CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the correct operation of the following components:

  • Wiring between node and steering wheel stalk

  • Control keys, see wiring diagram
    See E4010 INSTRUMENT PANEL
Move on to Step 61. Wiring faulty1. Repair wiring.
2. Stalk controls malfunctioning.2. Replace the steering column switch unitOp. 5550A12
6CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer presentEnd of diagnosis