Question about 2002 Mercedes-Benz C-Class

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My radio is working on the display, but no sound. Where is the fuse for the speakers.

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There is no fuse for speakers. check the wires that connect to them. they may be loose or unhooked.

Posted on Oct 04, 2010

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Got in my 09 Impala after work & no display or sound from my radio. Went to the gas station stopped opened the door no door chime? I have no clue what the problem is, the dash indicators work?


It seems to me you should check your fuses, they burn all the time. There inside your car most of the times under or near the steering wheel somewhere in that erea

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I want to check my radio speaker fuse on my 2003


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My Escape Radio, CD, and Aux input will not work. My temp gauge works, but all music controls do not, except for the load and eject buttons for the CD player. I replaced three fuses that according to my...


Which three fuse's did you replace ? You should check for B+ voltage on both side's of the fuse . Two little metal tabs on top of the fuse. Voltage on both , fuse is good .
Try radio self-diagnostic mode .
A fluctuating AC voltage audio signal is sent to the speakers directly from the audio unit to reproduce sound. The audio unit has a self-diagnostic mode that can be entered by pressing preset buttons 3 and 6 simultaneously.
Visual Inspection Chart Mechanical Electrical
  • Audio unit
  • Antenna or antenna cable
  • Speaker mounting/speaker cones
  • Radio ignition interference capacitor, radio frequency interference suppression bond, or radio receiver hood bonding strap
  • Smart junction box (SJB) fuse(s):
    • 7 (10A)
    • 12 (5A)
    • 16 (15A)
  • Battery junction box (BJB) fuse(s):
    • 7 (40A)
    • 15 (20A) (Hybrid)
    • 16 (25A)
    • 21 (40A)
    • 22 (40A) (Hybrid)
    • 23 (40A) (Hybrid)
  • Subwoofer amplifier
  • Circuitry
  • Audio unit

  1. If the concern is visually evident, GO to Symptom Chart .
  1. If the concern is not visually evident, proceed to the Speaker Walk-Around Test and the Audio Unit Self-Diagnostic Mode.

Speaker Walk-Around Test (Except Premium CD6)
NOTE: To enter the speaker walk-around test or audio unit self-diagnostic mode, the audio unit must be turned on and in the radio tuner mode (AM/FM).
  1. To enter the speaker walk-around test, simultaneously press the audio unit preset buttons 3 and 6.
  1. The speaker walk-around test stops at each speaker and applies sound to each speaker for about 1-2 seconds. Each speaker is tested and displayed on the audio unit in the following sequence: RF, LF, LR, RR and SUBWOOFER.
  1. To exit the speaker walk-around test, turn the ignition switch off, turn the audio unit off, or press preset button 1 for diagnostics (DIA).

Audio Unit Self-Diagnostic Mode (Except Premium CD6)
NOTE: To enter the speaker walk-around test or audio unit self-diagnostic mode, the audio unit must be turned on and in radio tuner mode (AM/FM).
  1. To enter the following tests, press the desired preset button while in the speaker walk-around test or while in the audio unit self-diagnostic mode.
  1. To exit the audio unit self-diagnostic mode, turn the ignition switch or the audio unit off.
  1. If the concern remains and the fault is not detected, GO to Symptom Chart to continue diagnostics.
  1. The self-diagnostic mode has 6 manual tests available:
    • Preset button 1 = ENTER DIAGNOSTICS. This test enters diagnostics from the speaker walk-around test. Metrics are available with SEL and ON buttons indicating time played in AM/FM, media, number of buttons pressed, etc.
    • Preset button 2 = EEPROM BLOCK STATUS. This test shows the validity of memory to calibrate the clock, and seek sensitivity.
    • Preset button 3 = EXIT DIAGNOSTICS.
    • Preset button 4 = Software configuration level. This test queries each radio system controller for its software configuration level.
    • Preset button 5 = DISPLAY TEST. This test lights all the display segments for five seconds and then turns all segments off.
    • Preset button 6 = RAM CONTENTS READOUT. To enter these tests, press preset button 1 while in the speaker walk-around test, then the desired preset button.
  1. To exit the self-diagnostic mode, turn the audio unit or the ignition switch off.
  1. If the concern remains and the fault is not detected, GO to Symptom Chart to continue diagnostics.

Oct 06, 2017 | 2008 Ford Escape

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Radio no audio 1990 bmw 535i


What happens if you turn the VOLUME to MAXIMUM?

If still no sound , then suspect problem with the speaker , connections or wiring

If loud hissing etc. then speakers appear OK so suspect a radio fault

Jun 15, 2010 | 1990 BMW 5 Series

1 Answer

No sound is coming out of the speakers when I turn the radio on. Is there a fuse that might need to be replaced? The radio display is working so I think it might be the speakers.


The radio has a amp. fuse built into the back of the radio. Cant tell you how to remove the radio without
more info about the car and the radio. The fuse is blade type located next to the control plug.
This could be your problem as blown speekers still make some noise normal sound is crackling if blown
hope this helps
please leave feed back

Dec 03, 2009 | 2003 Mini Cooper

1 Answer

MY RADIO AND CD PLAYER DISPLAYS SHOWS TO BE WORKING, HOWEVER THERE IS NO SOUND. THE FUSE BOX FUSES ARE ALL GOOD. THE SPEAKER WIRES ARE ALL CONNECTED. WHAT COULD POSSIBLY BE THE PROBLEM.


Some high-power players have an internal fuse in line with the speakers so that an external short will not blow the output transistors. Have someone skilled look for this.

Also, check that your speakers are not wired backwards; some speakers will connect one side of the voice coil to ground. If you connect the hot side of your CD player to the ground side of the speaker, you kill the sound.

Mar 07, 2009 | 2002 Suzuki XL-7

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My van radio runs on 2 different fuses- both in the fuse box under the dash. One runs the lights the other the sound. Hope this helps.

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