What could be the reasons for the ABS warning light to illuminate in a vehicle?

[DeElle]

ABS warning light can illuminate in various states, with different causes and solutions for each state. Details are as follows: State 1: ABS warning light remains constantly on (most common). Cause 1: The sensing part of the ABS speed sensor is covered by dirt, mud, or other contaminants, affecting the sensor's ability to detect the corresponding speed signal. This prevents the ABS computer from determining the vehicle speed and the wheel slip rate, thus failing to issue appropriate commands to regulate braking. Solution: Clean the dirt from the speed sensor and adjust the gap between the speed sensor and the signal ring to restore normal function. Cause 2: Poor signal due to loose connections in the system wiring or poor contact in the ABS relay, leading to system failure. Solution: Check the wiring connections and reconnect any loose parts. State 2: ABS warning light intermittently illuminates but turns off during acceleration. Cause: When multiple vehicle electrical devices are in use, the battery voltage drops below 10.5V. As the engine speed increases, the voltage rises, and the ABS warning light turns off. This can also occur if the ABS system power supply voltage is too low, such as due to poor terminal contact or grounding issues. Solution: Check the battery specific gravity; inspect the charging system; examine the power supply (e.g., voltage relay or poor power contact). State 3: ABS warning light remains on after engine start and only turns off when the engine is turned off (IGFF). Cause: Poor grounding contact in the ABS hydraulic valve body; poor contact in the ABS hydraulic valve body wiring connector; ABS computer malfunction. Solution: Loosen and then retighten the grounding screw of the hydraulic valve body, cleaning the contact surface if necessary; check if the connector gap has widened; replace the ABS or ABS/ASR computer. State 4: ABS warning light illuminates during high-speed driving. Cause: During high-speed driving, the ABS computer detects a significant discrepancy between the rear and front wheel speed signals; incorrect tire or wheel rim specifications. Solution: Refer to the vehicle's tire and wheel rim specifications, as indicated on the label near the fuel tank cap. State 5: ABS warning light intermittently illuminates. Cause: Improper adjustment of the brake light switch; poor internal contact in the brake light. Solution: With the engine running, press the brake pedal and use a finger to push the brake switch linkage fully downward, then release the brake pedal to complete the self-setting position; replace the brake light switch if necessary. If the ABS warning light is on, it is advisable not to continue driving. An illuminated ABS light indicates a malfunction in the vehicle's anti-lock braking system. During emergency braking, if the wheels lock up, the vehicle may skid uncontrollably, preventing the driver from slowing down or adjusting the vehicle's trajectory, posing significant safety risks.

[DiMaximus]

The ABS warning light is on, something I've seen frequently in decades of driving. The most common cause is an issue with the wheel speed sensor—either it's covered in dirt or snow and gets dirty, or it's internally damaged, especially after rain or snow. Aging wiring can also cause short circuits or poor contact, leading to signal interruption. Control unit failures are rare but dangerous, or it could be a blown fuse. Once, my car's light came on due to a sensor issue that caused the ABS to fail, and the wheels locked up during braking, nearly causing the car to skid off the road. When the light comes on, slow down and stop at a safe place immediately. Don't delay—head to the repair shop right away to have a technician check the specific fault code to prevent accidents. Regularly cleaning debris around the sensors can help avoid many problems.