| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Connect an EXAMINER and check the following on CAN NETWORK INFORMATION: No control units inactiveNo faulty control unitsno control units with faulty CAN
 | Move on to Step 1 | 1. Fault on CAN network | 1. Continue following the instructions for the diagnostic equipment | 
| 2. Communication impossible with the Body Computer | 2. Move on to Step 2 | 
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are present | Move on to Step 4 | 1. Presence of errors | 1. Continue following the instructions on the diagnostic instrument | 
| 2. Communication impossible with the instrument panel | 2. Move on to Step 3 | 
| 2 | ELECTRICAL POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check the electricity supply to the Instrument Panel Node is correct by carrying out the testSee Test 5560BV INSTRUMENT PANEL POWER SUPPLY CHECK | 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 | 
|---|
|  | Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected | Move on to Step 4 | Electrical connections not operational | Renew the damaged electrical connections | 
| 4 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Using an Examiner check, in Body Computer Node mode, that there are no errors | Move on to Step 7 | 1. Impossible to connect to the Body Computer control unit. | 1. Move on to Step 5 | 
| 2. Presence of errors | 2. Continue by following the instructions on the diagnostic instrument | 
| 5 | ELECTRICAL POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check the electricity supply to the Body Computer Node is correct. | Move on to Step 6 | Fault in positive electrical supply and/or earth | Replace defective component (in the case of a fuse, find out what caused it to blow). | 
| 6 | 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 7 | Impossible to connect to the Body Computer control unit. | Replace Body Computer    Op. 5505A32  BODY COMPUTER - R.R | 
| 7 | CHECK ON CORRECT OPERATION | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check that the fault is no longer present | End of diagnosis | The fault persists | Replace the Instrument Panel    Op. 5560B10  CONTROL PANEL - R+R |