| | Results of the tests |
| 1 | CHECK ON FRONT FOG LIGHT RELAY (POWER CIRCUIT) | All OK | Problems met | Operation |
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| On the engine compartment control unit, swap the front fog light relay with the horn relay (it is the third on the same row), and check that the front fog light works properly after the swap. | Continue to Step 2 | Even after the swap, the front fog lights still do not work | Continue to Step 3 |
| 2 | REPLACING HORN RELAY (POWER CIRCUIT) | All OK | Problems met | Operation |
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| Replace the horn relay (which was previously the front fog light relay) and check that they are working properly | End of diagnosis | . | |
| 3 | CHECKING FRONT FOG LIGHT RELAY SUPPLY (POWER CIRCUIT) | All OK | Problems met | Operation |
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| Refit the two relays in their original positions.With the ignition on, check that the front fog light is correctly supplied by the battery.Then connect to the relay supply from the Body Computer and check that when the front fog lights are switched on, the supply is sent to the relay.Also check that the electrical connections between the Body Computer, battery and relay are not faulty See E2030 FOG LIGHTS  | Do not connect the relay |
| Continue to Step 4 | No supply from battery | Restore the correct supply to the relay. If necessary replace the faulty components (if a fuse is involved, search for the cause of the problem) |
| Supply enablement not provided by the Body Computer | Continue to Step 6 |
| Connections faulty | Restore the correct connections See E2030 FOG LIGHTS |
| 4 | CHECKING WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
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| Connect the Examiner to the diagnostic socket.Check that there are no faults in the Body ComputerCheck light operation while in active diagnosis mode. | Continue to Step 5 | Fog lamp relay error | Continue to Step 6 |
| Lights not activated | Continue to Step 5 |
| 5 | CHECK ON INDIVIDUAL LIGHTS | All OK | Problems met | Operation |
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| Check the condition of individual bulbs and lamps | Continue to Step 6 | Bulb damaged | Change the bulb Op. 5540B22 |
| Left light cluster faulty | Repair or change the light unit Op. 5540B78 |
| Right light cluster faulty | Repair or change the light unit Op. 5540B79 |
| 6 | CHECK FOG LAMP ELECTRIC CIRCUIT | All OK | Problems met | Operation |
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| Check, in order: - front fog lamp fuse;
- connections between Body Computer and engine bay control unit;
- connections between engine bay control unit and bulbs;
- connections between Body Computer and fog lights switch;
- bulb earth See E2030 FOG LIGHTS
| Continue to Step 7 | Defective component | Replace the component involved (if a fuse is involved, search for the cause of the problem) |
| Connections broken | Restore the connections See E2030 FOG LIGHTS |
| 7 | CHECK ON FRONT FOG LAMPS SWITCH | All OK | Problems met | Operation |
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| Check the operation of the fog lights switch See E2030 FOG LIGHTS | Continue to Step 8 | Fog lights switch faulty | Replace the control panel Op. 7040A56 |
| 8 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
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| Check that the fault is no longer present | End of diagnosis | The fault persists | Replace the Body Computer Op. 5505A32 |