| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Connect the Examiner equipment to the diagnostic socket.Check warning light operation in active diagnosis mode | Move on to Step 2 | Warning light does not come on | Replace the instrument panel    Op. 5560B10  CONTROL PANEL - R+R | 
| 2 | ELECTRICAL SYSTEM CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check the correct power supply to the body computer and in particular the "D+" signal by carrying out    See Test 5530AA ALTERNATOR TERMINAL D+ CHECK | Move on to Step 3 | 1.Body Computer power supply incorrect | 1.Restore correct power supply | 
| 2.D+ signal between alternator and Body Computer interrupted due to defective wiring | 2.Renew the correct wiring | 
| 3.Alternator defective | 3.Replace the alternator    Op. 5530A10  ALTERNATOR - R+R | 
| 3 | CORRECT OPERATION CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
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|  | Check that the fault is no longer present | End of diagnosis |  |  |