| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check that the volume knob in the centre console is correctly adjusted. | Move on to Step 1 | Volume knob turned completely in an anti-clockwise direction. | Adjust the volume correctly. |
| 1 | ELECTRICAL CHECKS | All OK | Problems encountered | Operation |
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| Check that the speaker connections are correctly connected. | Move on to Step 2 | Speaker connections broken. | Restore the correct continuity. |
| 2 | CONTROLS ON THE STEERING WHEEL CHECK | All OK | Problems encountered | Operation |
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| Check, by connecting the Examiner to the Convergence control unit, that the controls on the steering wheel for adjusting the volume which can increase/decrease the audio volume are working properly see wiring diagram See E3510 RADIO If necessary, disconnect the controls on the steering wheel from the centre console and check that the fault disappears. | End of diagnosis. | Audio volume controls on the sterring wheel defective. | Replace the controls on the steering wheel Op. 5570T66 MODULE (ONE) ON STEERING WHEEL FOR RADIO CONTROL - R+R |