A functioning horn is one of a vehicle’s most critical safety features. If your Ford Mondeo’s horn isn’t working, there are a few potential causes. We’ll cover each of them, starting with the easiest and most likely issues and working from there. A test light can make diagnosing a horn that isn’t working much easier. They're a straight swap, even between Mk4.0 and Mk4.5 (which is the one you're looking at on eBay there). Mondeo Mk4 2008 (BA7) saloon 2.0 TDCi 130 PS (well, 152 PS with the Bluefin installed) Zetec Auto (TF-80/81SC) Speedo cluster type 1, firmware: 0246. Audio system: Alpine iLX-700 (aftermarket) Mike, It sounds like you have an intermittent connection in your fuse box not the switch. If you removed the fuse and the re-entered it and the lights started to work it must be related to the fuse. 1. The fuse socket has corrosion and needs cleaning or is too wide to receive the fuse blade. 2. You would have to trace the wiring, or see if the Haynes manual had a diagram. The switch may not go directly to the light, the BCM (electronic module in the interior fuse box) is usually involved. Other equipment (park sensors, trailer box) get the reverse status from the BCM over the CAN bus. Sometimes there is also a relay in the circuit. 3213 posts · Joined 2007. #6 · Jan 24, 2017. "Hi I have the similar problem my front passenger side light and the back side light are both gone wood that be a fuse or something els". As suggested check fuses F63&64 in passenger side fuse box. And test each bulb to see if it's blown. 72 posts · Joined 2011. #9 · Feb 11, 2013. I have heard that this issue stems from a poor battery unable to start all the cars equipment at once. There is possibly a software update that delays booting up the forward alert system until the engine has started. Mines in for a diagnostic check next week so we shall see. I'm not sure if number 1 is possible but I've done 2 & 3 on my UK 2015 mk5. I added reverse camera, rear DRLs, brake light flashes with indicator, 5 fashes of indicator and 12v socket time delay to 1s. 46. Name: Simon. Ford Model: Focus ST Line X. Ford Year: 2020. UK/Ireland Location: Worcestershire. Author. Posted February 22, 2022. On 2/21/2022 at 2:56 PM, unofix said: Never known of anyone else with problems of the puddle lights on a Mk4 Focus. .

mondeo mk4 dash lights not working