Next, turn the unit off and check the end of the cable (connector) if it blinks, and if this one blinks red light, it tells us that fiber is working. This tells us that the fiber optic from this unit is working. You will see the red light blinking in the opening where the connector is removed we should have a red blinking light. Start by removing the radio and the fiber optic in the back of the radio (orange cables). Troubleshooting S-Class W221 No Sound Problem You may have a noisy amplifier fan in the boot after you turn off the car for a few minutes Common Causes Sometimes, commands do not function and the screen will freeze.Īlso, a bad amplifier can lead to battery discharge. While on a call with someone, it will display a blank screen. There may also be a sound interruption, no radio station, and the radio will turn on and off every few minutes.
You will have issues like moving the joystick on the MMI unit, the needle does not change, and you won’t have audio or sound in the car. The amplifier problem in Mercedes Benz is widespread. The needle on the radio does not move from the joystick.Let’s look at this common issue, its symptoms, and how it can be diagnosed. One of the most common problems with the Mercedes-Benz S-Class W221 chassis is the amplifier’s failure, resulting in the unit not turning on or having no sound. Troubleshooting S-Class W221 No Sound Problem.
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