| 1 | RELAY CHECK | All OK | Problems encountered | Operation |
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| Remove the horn relay feed and check that the horns stop making a sound. | Move on to Step 2 | 1. The horn continues to sound even without the relay.2. The horn stops working. | 1. Replace engine compartment junction unit Op. 5550A10 STALK UNIT ASSEMBLY - R+R 2. Replace the relay. |
| 2 | WIRING CHECK | All OK | Problems encountered | Operation |
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| Check the insulation of the connection between the clock spring on the steering column switch unit and earth. | Move on to Step 3 | 1. Wiring insulation not correct between clock spring and earth.2. Clock spring short circuited | 1. Restore the correct insulation.2. Replace the clock spring. |
| 3 | HORN ELECTRICAL CHECK | All OK | Problems encountered | Operation |
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| Check the button on the steering wheel is working properly. | End of diagnosis. | Button on steering wheel mechanically stuck. | Replace the horn control Op. 5550B30 L/H OR R/H HORN (ONE) - R+R |