Why do the hazard lights flash when braking in a Great Wall C30?

[VonCarson]

When the hazard lights flash while braking in a Great Wall C30, it is due to the brake strobe mode feature of Great Wall vehicles. Below is an introduction to the Great Wall C30: Dimensions: The Great Wall C30 is a compact sedan under the Great Wall brand, with a wheelbase of 2610 mm, and length, width, and height of 4471 mm, 1705 mm, and 1480 mm respectively. Powertrain: The Great Wall C30 is equipped with a 1.5-liter naturally aspirated engine across all variants, delivering 106 horsepower and a maximum torque of 138 Nm. This engine reaches its peak torque at 4200 rpm and its maximum power at 6000 rpm. It features VVT technology and multi-point fuel injection, with an aluminum alloy cylinder head and block. The engine is paired with a 5-speed manual transmission.

[DeNaomi]

Last time my car had this weird issue too, the hazard lights would automatically turn on when I stepped on the brake. I thought it was a system error. It's most likely a problem with the brake light switch because it's connected to the hazard light circuit control module. Once the switch is damaged or has poor contact, the brake signal can mistakenly trigger the hazard lights. Secondly, there might be a short circuit or aging in the wiring. Some models of the Great Wall C30 have this design flaw—I once checked the repair manual, which indicated it could be due to relay sticking or fuse blowout causing signal interference. Additionally, unstable battery voltage or a faulty body control module can also cause this. I recommend checking the brake light switch first. The simplest way is to have a friend step on the brake while you check if the rear lights are functioning normally. If the bulbs also flicker, it means the switch is faulty. Don’t delay—get it fixed at a professional shop as soon as possible to avoid major trouble during night driving. Safety first! After I replaced the switch, everything was fine.

[MacRobert]

As a beginner in car maintenance with some basic knowledge, there must be a reason why the hazard lights of the Great Wall C30 come on when braking. The most common issue lies in the braking system, such as a burnt-out brake light bulb or loose wiring connections, which can cause electrical current to interfere with the hazard light control circuit. It could also be a blown fuse—check the one labeled 'Brake Light' in the engine compartment fuse box. When blown, the system automatically activates the hazard lights as a safety warning, a user-friendly design but prone to false alarms. Additionally, corrosion in the relay box or headlight assembly connectors may confuse signals. It's recommended to first test the brake light voltage with a multimeter. If fluctuations are significant, avoid tampering with the circuit and instead visit a repair shop to diagnose potential ECU setting issues with a scanner, preventing minor problems from escalating into costly repairs. Regularly avoid water ingress into electronic control boxes during car washes to prevent such faults.

[FrankFitz]

From an automotive electrical circuit perspective, the Great Wall C30's hazard lights flashing when braking is likely caused by signal interference. The brake pedal has a sensor that sends signals to the ECU to control the brake lights, but if there are circuit design flaws or module aging, the signal might cross over to the hazard light control unit, activating the flashing. Alternatively, a body network communication bug could cause CAN bus data conflicts, mistakenly triggering the hazard light function. During inspection, the brake switch should be removed to test if its resistance value is abnormal. Then, check the main wiring harness for any short circuits and use an oscilloscope to observe waveform anomalies for easier diagnosis. High battery voltage or poor grounding can also be contributing factors. It's recommended to visit a 4S shop to update the software or replace the integrated control board. Addressing this issue promptly can prevent damage to other electrical components. After repair, regular maintenance of the vehicle's electrical system is advised.