|  |  | Results of the tests | 
| 1 | CHECKING BULB | All OK | Problems met | Operation | 
|---|
|  | Check
LH or RH bulb efficiency/condition | Continue to Step 2 | Bulb defective | Change bulb  Op. 5550D26 | 
| 2 | CHECKING ELECTRICAL EQUIPMENT | All OK | Problems met | Operation | 
|---|
|  | Check
the continuity of the wiring from facia control unit to RH and LH
reversing light   See   E2022  REVERSING LIGHTS | Continue to Step 3 | Wiring with o.c. | Renew the wiring See   E2022  REVERSING LIGHTS | 
| 3 | CHECKING FACIA CONTROL UNIT | All OK | Problems met | Operation | 
|---|
|  | Check
the continuity of the facia control unit internal circuit | Continue to Step 4 | Circuit defective | Change the facia junction
unit  Op. 5505A10 | 
| 4 | CHECK CORRECT OPERATION | All OK | Problems met | Operation | 
|---|
|  | Check
that the fault is no longer present |  | Fault persists | Change light  Op. 5550D24Search
for the fault starting from another symptom' |