How to fix car turn signal?

To fix a car's turn signal malfunction, troubleshooting should be carried out step by step from basic to complex. First, check if the bulb is damaged; a multimeter can be used to test the circuit's power supply. If the bulb is blown, replace it with a component of the same specification (an aftermarket bulb costs about 30 ringgit). If both left and right turn signals fail to light up, check the fuse, flasher relay, and turn signal switch in sequence. Short-circuiting the relay terminals with a screwdriver can determine if it is faulty, and replacement should match the original factory model. For wiring issues, focus on checking for broken wires or oxidized contacts at the hinge position inside the rubber hose. If the power steering system is involved (e.g., contaminated fluid or clogged filter), clean or replace components such as the steering pump control valve, and ensure tyre pressure meets the standard. When operating on your own, be sure to disconnect the power supply. If the fault light remains on or flashes abnormally, it may be due to steering gear piston wear or CAN bus communication issues. In such cases, It is best to use a professional diagnostic tool to read the fault codes and refer the matter to an authorised service centre. As a critical safety signaling device, the turn signal should be verified by both the dashboard indicator and the external light after repair to ensure stable flashing frequency and normal brightness. In emergency situations, the hazard warning lights can be used temporarily, but a complete repair should be done as soon as possible to comply with traffic regulations.