| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check that the side lights are activated correctly using the steering column switch unit with the ignition ON | Move on to Step 1 | Not even the side lights are working | Continue as described by the diagnostic equipment | 
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and that the parameters are present. | Move on to Step 5 | 1. Impossible to connect with the Instrument Panel control unit | 1. Move on to Step 2 | 
| 2. Presence of errors | 2. Continue following the instructions on the diagnostic instrument | 
| 2 | ELECTRICAL POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check the electricity supply to the Instrument Panel Node is correct. | Move on to Step 3 | Fault in positive electrical supply and/or earth | Replace defective component (in the case of a fuse, find out what caused it to blow). | 
| 3 | CHECK ELECTRICAL CONNECTIONS | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected.    See E4010 INSTRUMENT PANEL | Move on to Step 4 | Electrical connections not operational | Renew the damaged electrical connections | 
| 4 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Use an Examiner to check the possibility of connection to the Instrument Panel Node | Move on to Step 5 | Impossible to connect with the Instrument Panel control unit | Replace the Instrument Panel    Op. 5560B10 CONTROL PANEL - R+R | 
| 5 | ACTIVE DIAGNOSIS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | With the Examiner in the Instrument Panel Node ambient check that the panel lighting is correctly activated in Active Diagnosis. | Move on to Step 6 | The panel lighting is not activated | Replace the Instrument Panel    Op. 5560B10 CONTROL PANEL - R+R | 
| 6 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Using the Examiner check, in the Body Computer ambient, that there are no errors and that the lighting parameter varies. | Move on to Step 7 | 1. Impossible to connect to the Body Computer control unit. | 1. Move on to Step 7 | 
| 2. Presence of errors | 2. Continue following the instructions on the diagnostic instrument | 
| 3. The parameters do not change | 3. Move on to Step 9 | 
| 7 | ELECTRICAL POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check the electricity supply to the Body Computer Node is correct. | Move on to Step 8 | Fault in positive electrical supply and/or earth | Replace defective component (in the case of a fuse, find out what caused it to blow). | 
| 8 | CONNECTIONS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check the continuity of the wiring between the control panel and the Body Computer Node    See E4010 INSTRUMENT PANEL | Move on to Step 9 | Electrical connections not operational | Renew the damaged electrical connections | 
| 9 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Use an Examiner to check the possibility of connection to the Body Computer Node | Move on to Step 10 | Impossible to connect to the Body Computer control unit | Replace Body Computer    Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R. | 
| 10 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check that the fault is no longer present | End of diagnosis |  |  |