| 0 | PRELIMINARY CHECKS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| With the panel off, lift up the wiper blades and check that the pins are correctly fastened to the arm holders. | Move on to Step 1 | The arms are not correctly fastened (nut defective or not correctly tightened). | Replace and/or tighten the fixing nut to torque. |
| 1 | WINDSCREEN WIPER FUSE CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the condition of the windscreen wiper fuse. | Move on to Step 2 | The fuse is broken. | Replace the fuse (and find out what could have caused it to blow). |
| 2 | VEHICLE WIRING CONNECTIONS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Following the removal of the wiper arms and trim, check the condition of the vehicle wiring connector and make sure it is correctly inserted in the windscreen wiper socket.Op. 5050B34 WINDSCREEN WIPER ARM/S COMPLETE WITH BLADE - R+R | Move on to Step 3 | 1.Connector damaged. | 1. Replace the connector. |
| 2.Connector not correctly inserted. | 2. Restore correct connection. |
| 3 | CHECK ON TENSION AT WIRING TERMINALS | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Disconnect the connector from the windscreen wiper and switch on the panel and select the various functions using the steering column switch unit checking the tension at the wiring terminals (correct tension at battery terminals 13.5 V). | End of diagnosis | 1. The voltage measured is not correct (the wiring is broken or the steering column switch unit is not working properly). | 1. Restore the correct connections and/or replace the steering column switch unit. Op. 5550A10 STALK UNIT ASSEMBLY - R+R |
| 2. The voltage measured is the same as that of the battery (windscreen wiper defective) | 2. Move on to Step 4. |
| 4 | WINDSCREEN WIPER MOTOR POWER SUPPLY CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check the following, in order:- Connection to earth of motor;
- Motor power supply line
See E3020 WINDSCREEN WASH/WIPE | Move on to Step 5 | Connection broken. | Restore the correct connections. |
| 5 | WINDSCREEN WIPER MOTOR CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION |
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| Check that the windscreen wiper motor is working properly and, in particular, the internal electronic device. | End of diagnosis | 1.Motor intermittent electronic device faulty. | 1. Replace the intermittent electronic device. Op. 5050B38 WINDSCREEN WIPER ASSEMBLY - R+R OR REPAIR |
| 2. Windscreen wiper motor faulty. | 2. Replace the windscreen wiper motor. Op. 5050B38 WINDSCREEN WIPER ASSEMBLY - R+R OR REPAIR |
