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Removed my bumper to install the PLM XL heat exchanger in my CLS55 and noticed these two yellow and brown wires with connectors and a hose that’s plugged by a bolt. I bought this car two and a half months ago so I have limited knowledge when it comes to the wiring. Any input will be appreciated
Edit to add: the hose might be for your headlight washer fluid.
The headlight washer hose explains why it isn't working, although I don't use it. My horn on the other hand works fine though. Are there multiple horn sirens?