
221 Classic Sylphy has a horn sound when locking the car. The hidden functions of the 2021 Classic Sylphy are as follows: One-touch window lift: When the key is in the ON position, during startup or driving, pull up the switch of the left front window until the glass reaches the top and hold for 5 seconds to achieve one-touch window lift. After getting in the car, close all 4 doors and windows, shift to P, turn the key to the ON position but do not start the engine, press and hold the left door unlock button for more than 5 seconds until the hazard indicator flashes twice. The configuration of the 2021 Classic Sylphy is as follows: The 2021 Classic Sylphy is a compact car with a 1.6L L4 engine, naturally aspirated, with a maximum horsepower of 135ps and a maximum torque of 159nm. The car's length, width, and height are 4641mm, 1815mm, and 1450mm respectively, with a wheelbase of 2712mm. The body type is a 4-door, 5-seater sedan, with a CVT continuously variable transmission, and a top speed of 186 km/h.

I bought a 2021 classic Sylphy last year, and after driving it for so long, I realized that the factory settings really don’t include a horn sound when locking the car. When locking, there are only two flashes of the hazard lights as a prompt. At first, I thought it was broken and even went to the 4S store to ask the technician. He said this is how the series is designed, and if I wanted a horn sound, I’d have to modify it myself. I spent about a hundred yuan on Taobao to buy an OBD interface window-closer module, installed it myself, and now there’s a beep when locking the car, which is super convenient. However, you have to be careful not to plug it into the wrong interface during installation—I heard someone messed up and caused their windows to malfunction. Actually, not having a sound has its benefits too, like not disturbing the neighbors when locking the car at night.

I drove a taxi for five years and switched to the Sylphy Classic last year. This car doesn't have an audible horn prompt when locking—you have to watch for the light flash to confirm it's locked. Once in a rainy underground garage, it was too noisy to notice the light, and the door didn't lock properly. Luckily, nothing was stolen. Later, I installed an anti-theft module at an auto parts market for just over 200 yuan. Now, it beeps and closes the windows automatically when locking—totally worth it. Before installation, check compatibility with your car model, as some low-quality modules can interfere with the original wiring. The horn doesn’t need to be too loud—just audible enough to avoid disturbing neighbors at night and getting complaints.

There are several 2021 Sylphys in our neighborhood, and none of them make a sound when locking. Once, our neighbor Lao Wang said he was always worried that his car wasn't locked, so he simply installed an anti-theft device himself. Now his car emits two beeps when locked, which can be quite noisy at night. Personally, I've gotten used to checking the turn signal flashes and giving the door a pull to confirm after locking. This design in the Sylphy might be to reduce noise, but it's indeed a bit inconvenient in underground parking lots. If you want to add this feature, I recommend a dedicated OBD module designed for your car model. It doesn't require cutting any wires, is easy to install, and costs around a hundred yuan.

When I first got my 2021 Sylphy, I was also puzzled why there was no sound when locking the car. After asking the 4S store's after- service, they said the entire series doesn't come with this feature from the factory, as it's designed to reduce urban noise pollution. However, it can be retrofitted later, with the store quoting over 300 yuan to install a control module. Through my own research, I found that Taobao sells automatic window closers with a honking function, which can be used by simply plugging into the OBD port. Now, the car beeps once when locked and automatically closes the windows, which is especially practical in summer. Remember to test the sensitivity after installation, as some car owners have reported occasional malfunctions during rainy days.

My wife drives a Sylphy to pick up the kids and always complains that she feels uneasy because there's no sound when locking the car. The factory setting indeed doesn't include a horn beep feature, so every time she locks the car, she has to specifically check if the side mirrors fold or the lights flash. Later, we added a small accessory to the car, and now pressing the key results in a short beep, which can also automatically close the sunroof. The modification cost less than 200 yuan, and it took only half an hour to install by following a tutorial. It has been working stably for over a year, except for occasional delays in cold winter temperatures. Actually, many Japanese cars nowadays have eliminated the locking horn beep, mainly relying on light signals instead. You'll get used to it.


