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Discussion Starter · #1 ·
Hey guys, I bought a used 09 fa5 sedan a couple months ago

I’m currently having issues with some electrical stuff with the car and I’ve checked all the fuses and theyre All fine and non are burnt

first is the passenger window rolls down with the driver switch but won’t roll back up with the same driver switch.(it works just fine with the passenger switch so I’m always having to reach over to the passenger to roll it up)

second is the radio glitches up on me randomly, but it almost seems like if I speed up too fast or hit a bump (basically enough force to kinda move wires I guess) it glitches and it’ll change source (fm,xm,usb) and the radio lights will also go out and come back on randomly as well but they’re mostly off than on.

also something else I noticed is that whenever I hit any electrical button or switch or even turn up the radio, you can feel the engine idle down a little. And if there’s a song playing it’ll idle down to the same bea of the song. When no electorally button is pressed or switched (windows and stuff) and the radio isn’t playing, the car idles perfectly fine.

and just recently it seems like my passenger side speakers just went out as well. With no abuse to them whatsoever.

it just seems as if this car has a pretty big electrical problem and I’m just needing help figuring it out, thank you guys in advanced
 

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Discussion Starter · #2 ·
I don’t know much if anything about a cars electrical system which is why I only thought to check the fuses because I don’t know what else to check besides that.

i should also add that I have a check engine light for a ECT sensor and it also says “high voltage” with that code. Idk if that helps in any way
 

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Clean your ground connection from the battery, this should hopefully fix the light dimming/idle drop/radio restart problem, if the battery isn't getting a good grounding, then these will all be possible problems. Get the battery load tested and also test the alternator, if the alternator can't charge the battery well enough, idle drop/surge will occur as the engine is trying to produce more power for the alternator to perform better. As for the corner speakers going out, check in the trunk underneath the speakers in the deck, this is likely the sound system grounding out the component speakers, this happens when the metal of the connectors for the speakers touches the metal of the chassis of the vehicle, the sound system notices a ground and will stop playing music through them as a safety precaution. As for the engine idling at the same beat as the music, you might be dealing with a battery problem, as the music draws amperage from the battery if the battery doesn't have enough to give it will rev to charge the battery, refer to my explanation for testing the alternator/battery earlier, same reasoning. I presume by "to the beat of the music" you are referring to the bass of the music? If you have a subwoofer and amplifier hooked up this is most likely your main suspect for most of these problems. If not, like I said, test the battery, test the alternator, if all fuses are fine remove the head unit and check for if wires are stripped/corroded and possibly grounding, check for grounding connectors on the speakers, and clean your battery ground connections. And also make sure your leads to your battery are not corroded and are snug and large enough for a good connection. Only thing I didn't address is the window rolling up/down. My only thought on this is possibly the window regulator could be going going gone, or very possibly the switch is going bad on the drivers side panel. I am no expert in this situation, but I can say I have had almost all of the other problems happen before on my car.
 
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