| 1 | RADIO CONNECTIONS CHECK | All OK | Problems encountered | Operation |
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| Release the radio from the dashboard and check that the connections are correctly fitted. | Move on to Step 2 | 1. Connections not correctly fitted.2. Speaker wiring interrupted/short circuited. | 1. Refit connections.2. Restore wiring See E3510 RADIO |
| 2 | ELECTRICAL CONNECTION CHECK | All OK | Problems encountered | Operation |
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| Release the radio from the dashboard and check that it is receiving the correct power supply by carrying out the Test See Test 5580PD CENTRAL CONSOLE OPERATION CHECK | Move on to Step 3 | 1. Positive ignition-controlled power supply interrupted.2. + 30 power supply interrupted.3. Earth power interrupted. | 1. Restore +15 power supply.2. Restore +30 power supply.3. Restore the correct earth connection. |
| 3 | AUDIO CONTROLS ON STEERING WHEEL CHECK | All OK | Problems encountered | Operation |
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| Check that the audio controls on steering wheel are working properly (if fitted) See E3510 RADIO | Move on to Step 4 | Controls on steering wheel defective. | Repair/replace the controls on the steering wheel Op. 5570T66 MODULE (ONE) ON STEERING WHEEL FOR RADIO CONTROL - R+R |
| 4 | CHECK AUDIO SIGNALS | All OK | Problems encountered | Operation |
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| Check for audio signals at the radio final output stage by carrying out the Test See Test 5570TF SPEAKER OPERATION CHECK | End of diagnosis. | Audio signals at the radio output interrupted because the final audio stage is interrupted. | Replace the radio Op. 5570T80 CAR RADIO EQUIPMENT - R+R |