| 0 | BULB CONTINUITY CHECK | All OK | Problems encountered | Operation |
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| Check the continuity of the bulb filament. | Move on to Step 1 | Bulb broken. | Replace the bulb Op. 5540A50 BULB FOR REAR LIGHT CLUSTER (ONE), LEFT OR RIGHT - REPLACE |
| 1 | WIRING CONTINUITY CHECK | All OK | Problems encountered | Operation |
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| Check:- Continuity of the wiring between the bulb and the engine compartment junction unit. | Move on to Step 2 | Wiring broken. | Restore wiring continuity. |
| 2 | CHECK ON OPERATION OF ENGINE COMPARTMENT JUNCTION UNIT | All OK | Problems encountered | Operation |
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| 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. |