What Causes the Pre-Collision Braking System Failure in the 14th Generation Sylphy?

[AmyFitz]

14th Generation Sylphy pre-collision braking system failure is caused by malfunctions in the front camera, image processing control unit, lane change assist system, parking assist system, or navigation system. When the pre-collision system light illuminates, it alerts the driver to obstacles ahead, requiring attention to avoid excessive speed and potential collisions. The Sylphy is a compact sedan under Dongfeng Nissan, featuring a MacPherson strut front suspension and a torsion beam rear suspension. Its body dimensions are 4631mm in length, 1760mm in width, and 1503mm in height, with a wheelbase of 2700mm. Powering the vehicle is a 1.6L naturally aspirated engine paired with a 5-speed manual transmission.

[AsherRose]

We often encounter this issue during car repairs. For the 14th-generation Sylphy's pre-collision system failure, there are typically several possibilities: The most common is when the camera above the windshield gets blocked by dirt—bird droppings or heavy rain can cause it to malfunction. If the software hasn't been updated for a long time, it might suddenly act up, just like a lagging phone. If the dashboard warning light comes on, you should also check if the radar sensor is covered in mud. Once, I dealt with a car where the system gave false alarms because the wiring harness was disturbed during a dashcam installation. Now, in cold weather, we also need to watch out for condensation affecting sensor accuracy. For issues involving automatic emergency braking, don’t try to fix it yourself—use Nissan’s dedicated diagnostic tool to check the trouble codes immediately.

[HoldenLynn]

As someone who pays attention to automotive safety, I've noticed that pre-collision failures often occur in the sensor components. For example, if the dual-camera and radar modules in the Nissan Sylphy are misaligned with the millimeter wave or displaced due to long-term vibration, they may misjudge road conditions. Unstable power supply in electronic systems is also common—for instance, if the battery voltage drops below 12 volts, the control module may go into hibernation and stop functioning. Some owners have reported that overly thick window films can also block signals. Remember to check if the relevant fuses in the fuse box have blown. These safety features are quite delicate; even using a high-pressure car wash spray too aggressively can lead to water ingress and short circuits. It's recommended to clean the sensor areas with a soft cloth every six months—don't wait until an accident happens to regret it.

[TeaganAnn]

Pre-collision failure can only stem from three aspects: hardware issues like damaged sensors, software problems such as version bugs, or environmental factors like backlight interference. Focus on checking whether the radar cover near the front logo is dented and whether the wiring connectors are oxidized or loose. If the system self-check fails, first attempt a power cycle restart. If the warning light remains constantly lit, a professional workshop inspection is mandatory—don't rely solely on restarts to permanently resolve the issue.