| | Test results |
| 1 | ELECTRICAL SYSTEM CHECK | All OK | Problems encountered | Operation |
|---|
| Check the third brake light earth is efficient See E2021 BRAKE LIGHTS Check the conditino of the third brake light bulb | Move on to Step 2 | 1. Earth inefficient2.Bulb burnt out | 1. Restore correct earth.2. Replace the bulbOp. 5550D17 THIRD BRAKE LIGHT BULB(S) - R.R |
| 2 | ELECTRICAL SYSTEM CHECK | All OK | Problems encountered | Operation |
|---|
| Check the continuity of the connection between the third brake light and the switch See E2021 BRAKE LIGHTS | Move on to Step 3 | Connection broken | Restore the correct electrical connection. |
| 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 cables in the correct position |
| 4 | CORRECT OPERATION CHECK | All OK | Problems encountered | Operation |
|---|
| Check that the third brake light comes on | End of diagnosis | Does not come on | Replace the third brake light Op. 5550D16 THIRD BRAKE LIGHT - R+R |