What is the reason for no sound from the speakers in the two rear doors of the car?
4 Answers
The lack of sound from the speakers in the two rear doors of the car is due to the vehicle's sound field adjustment being set to only produce sound from the front. You can operate the vehicle's multimedia system, enter the sound settings interface, and then make the necessary adjustments. Relevant information about the car music player is as follows: 1. Indicators: The car music player has single-loop and random play modes, where random play is denoted as 'rdm', an abbreviation of the English word 'Random'. 2. Function: The music player in the car not only provides music enjoyment and radio listening for passengers during daily driving and traffic jams but also enriches the driving atmosphere inside the car, thereby alleviating the boredom of passengers who spend long periods inside the vehicle, offering musical joy, and enhancing the pleasure of driving.
I just helped a neighbor check a similar issue last week. There are usually several possibilities when the rear speakers have no sound. First, check if you accidentally pressed the sound field settings and adjusted all the sound to the front seats. If the settings are fine, then you need to see if the speakers are blown or if there’s a wiring issue. In some car models, the rear wiring runs through the sill panels, where water can easily corrode the connectors. Also, check if the wiring harness near the door hinges is broken—frequent door openings can cause wear and tear on the wires there. If all else fails, you’ll need to remove the door panel and test the amplifier’s output voltage. Last time, I found that my neighbor’s amplifier had a dead rear sound field channel. Don’t try to fix such issues on your own—it’s safest to visit a professional audio shop and spend around a hundred bucks for a diagnosis.
This issue stems from the audio system structure. The car audio system powers and sends signals to the front and rear speakers via wiring harnesses from the head unit. When there's no sound from the rear, the fault could lie in the head unit output, wiring, or the speakers themselves. Test by connecting a mobile player to the AUX port—if sound comes from both front and rear, the head unit is functioning, indicating the problem is with the wiring harness or speakers. Focus on checking for loose connections at the B-pillar wiring harness connector, a common failure point. For vehicles with independent amplifiers, inspect the amplifier fuse and rear channel output signals. Also, check if the door wiring harness waterproof cover is damaged, leading to corrosion. Don't overlook connector corrosion—80% of faults in my clients' cases are due to oxidation causing poor contact.
The issue of no sound in the rear speakers could be quite straightforward. First, try restoring the factory settings in the audio configuration, as accidental operations might have muted the channels. If the settings are confirmed correct, unplug the speaker connector and use a multimeter to measure the coil resistance, which is typically around 4 ohms. If there's no continuity, the coil is likely burnt out. If there's resistance but no sound when powered, the crossover capacitor might be short-circuited. For wiring inspection, locate the rear speaker output wires (usually purple or green-purple) at the back of the audio unit and trace them to find any breaks. For older vehicles, pay special attention to aged or damaged wiring harnesses in the door panels, which can cause a short to ground. A common issue with a certain German brand is the design flaw in the hinge wiring harness, with over 80% of models older than three years experiencing this problem.
