|  |  | Results of the tests | 
| 1 | CHECKING REVERSING LIGHT SWITCH | All OK | Problems met | Operation | 
|---|
|  | Check
reversing light switch operation | Continue to Step 2 | Switch always closed | Replace switch  Op.   5550D22 | 
| 2 | CHECKING ELECTRICAL EQUIPMENT | All OK | Problems met | Operation | 
|---|
|  | Check
wires of lead from switch to intermediate connection are insulated
from one another See   E2022  REVERSING LIGHTS | Continue to Step 3 | Wiring s.c. | Renew the wiring See   E2022  REVERSING LIGHTS | 
| 3 | CHECKING ELECTRICAL EQUIPMENT | All OK | Problems met | Operation | 
|---|
|  | Check
wires of lead from facia control unit to intermediate connection
are insulated from one another   See   E2022  REVERSING LIGHTS | Continue to Step 4 | Wiring s.c. | Renew the wiring  See   E2022  REVERSING LIGHTS | 
| 4 | CHECKING ENGINE BAY CONTROL UNIT | All OK | Problems met | Operation | 
|---|
|  | Check
insulation of engine bay control unit internal circuit See   E2022  REVERSING LIGHTS | Continue to Step 5 | Circuit s.c. | Change engine bay junction
unit  Op. 5505A13 | 
| 5 | CHECK CORRECT OPERATION | All OK | Problems met | Operation | 
|---|
|  | Check
that the fault is no longer present |  | The fault persists | Search for the
fault starting from another symptom' |