| | Test results |
| 1 | ELECTRICAL SYSTEM CHECK | All OK | Problems encountered | Operation |
|---|
| Check the third brake light earth is efficient See E2021 BRAKE LIGHTS | Move on to Step 2 | Earth inefficient. | Restore correct earth See E2021 BRAKE LIGHTS |
| 2 | ELECTRICAL SYSTEM CHECK | All OK | Problems encountered | Operation |
|---|
| Check the continuity of the connection between the third brake light and the engine compartment junction unit See E2021 BRAKE LIGHTS | Move on to Step 3 | Connection broken. | Restore the correct connection See E2021 BRAKE LIGHTS |
| 3 | CHECK ON CONNECTION AT THIRD BRAKE LIGHT | All OK | Problems encountered | Operation |
|---|
| Check that the cables are correctly positioned in the connector. | Move on to Step 4 | Cables incorrectly positioned. | Fit the wires in the correct position. |
| 4 | CORRECT OPERATION CHECK | All OK | Problems encountered | Operation |
|---|
| Check that the third brake light comes on. | Move on to Step 5 | Does not come on. | Replace the third brake light Op. 5550D16 THIRD BRAKE LIGHT - R+R |
| 5 | CHECK ON CORRECT OPERATION OF ENGINE COMPARTMENT JUNCTION UNIT | All OK | Problems encountered | Operation |
|---|
| Check that the engine compartment junction unit is working properly. | End of diagnosis. | Engine compartment junction unit defective. | Replace the engine compartment junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |