|  | TEST RESULTS | 
| 1 | RADIO CONNECTIONS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Release the radio from the dashboard and check:- connections correctly inserted- condition of radio fuse | Move on to Step 2 | 1. Connections not correctly fitted2. Speaker wiring interrupted/short circuited3. Fuse blown | 1. Refit connections2. Restore the correct wiring    See E3510  RADIO 3. Replace the fuse after having identified the cause | 
| 2 | ELECTRICAL SUPPLY CONNECTIONS CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Release the radio from the dashboard and check that it is receiving the correct power supply- Check that the supply from the +30 is correct- Check that the supply from the +15 is correct - Check that the earth connection is correct    See Test 5580PD CENTRAL CONSOLE OPERATION CHECK | Move on to Step 3 | 1. +30 power supply from dashboard control unit interrupted2. +15 power supply from dashboard control unit interrupted3. Earth power interrupted | 1. Restore +30 power supply replacing fuse F51 in the CPL after having identified the cause2. Restore +15 power supply replacing fuse F39 in the CPL after having identified the cause3. Restore the earth connection on the tunnel. | 
| 3 | AUDIO CONTROLS ON STEERING COLUMN SWITCH UNIT CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check that the audio controls on the steering column switch unit are working properly (if fitted)    See E3510  RADIO | Move on to Step 4 | Controls on steering wheel defective | Replace the controls on the steering wheel. | 
| 4 | CHECK AUDIO SIGNALS | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check for audio signals at the radio final output stage    See Test | 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 |