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Malfunctions in radio system

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  1. Check error and customer complaint.
  2. Switch ignition off and remove ignition key.
  3. Remove radio fuses (ignition and memory).
  4. Wait approx. 3 minutes until all components are free of tension.
  5. Insert fuses again.
  6. Check error and customer complaint again.
    MALFUNCTIONS IN RADIO SYSTEM DIAGNOSIS

    Work instruction Yes No
    1 Check error and customer complaint again. Radio function OK? Check battery charging condition and battery cables for perfect contacts.
    If the problem persists, contact radio manufacturer
    End    		 Does radio have a CD player or a magnetic-tape drive?
    Yes Check signal lead
    No Go to Step 2
    2 Does radio have a display? If an audio signal can be heard, connect a functional radio.
    Step 3
    If no audio signal can be heard Step 5    		 Step 6
    3 Does the system now function perfectly? Replace radio
    End    		 See INTERFERENCE NOISES  End
    4 1. Check all radio connections. 2. Check voltage at the connections battery  and ignition  . 3. Check ground connection of radio.
    Radio function OK?    		 Repair wiring harness or plug connection
    End    		 Connect functional radio
    Step 3
    5 1. Disconnect audio connections from radio. 2. At maximum volume setting, measure the alternating voltage at the outputs. 3. Is the voltage between 8.4 and 11.0V?
    Radio function OK?    		 1. Check connection between the radio and the amplifier with an ohmmeter. 2. Check the audio connections (+) and (-) for short circuits or ground connections. 3. Check polarity of the entire wiring. 4. Repair any detected damage.
    End    		 Connect functional radio
    Step 3
    6 Is a short circuit present? Repair the cable connection and check the system
    End    		 Step 4
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