According to the owner, the car turn on the left and turn the brake pedal, ABS fault light is lit; and turn right to turn the light brake pedal, ABS fault light does not shine, everything is normal. Then, on the bus, turn right and turn right and turn the brake pedal, ABS fault light does not shine. everything is normal. Turn left and turn the pedal, and after a few seconds, the ABS fault light is on. At this time, found a new problem. Turn the lights on the left and right, after the brake pedal, not only ABS fault light. Moreover, the flashing frequency of the turn signal also increased, that is, turn the lights flash quickly. According to experience, the turnlight flicker frequency is improved because one side of the turn signal has a light bulb that does not light up. Will appear above to now. To this end, immediately check the left front and rear turn signal, left front turn signal normal. And the left rear turn signal is normal when the brake pedal is not pedaled. Left rear turn signal is not bright, and become a left rear brake light one light off a flashing. According to this phenomenon. Judgment may be due to the left rear taillight wire break or poor contact. Check the left rear taillight and find the common ground wire plug really bad contact. Will be dealt with after the wire plug. Steering lights, brake lights are normal. At this time, and then check the ABS fault light is not bright. It can be concluded that the ABS system does not exist. But because the left rear taillight common grounding cable plug failure, which led to ABS system is not normal.
    Why is the above phenomenon? Analysis is as follows: due to the common ground wire plug bad contact. There is a certain resistance, a separate turn to turn the lights or brake lights, because a light bulb current is not. The voltage drop across the common ground wire plug contact resistance is not large and most of the voltage is applied to one of the turn lights or brake lights. The power of the lamp will not be greatly affected, so, alone turn the lights or brake lights, the basic normal, the fault will not be exposed. When the lights and brake lights are turned on at the same time. The current on the common grounding wire plug is increased. The contact resistance is constant, according to Ohm's law. The voltage drop u is equal to the current I multiplied by the resistance R, that is to say. In the case of constant voltage and resistance. The greater the current, the greater the voltage drop across the contact resistance. At this time, the current of the two bulbs at the same time through the poor contact with the common grounding wire plug, most of the voltage drop in the common grounding wire plug contact resistance. And the two bulbs on the share of the voltage is only a small part, not enough to make the two bulbs glow. Or even if the light is very dark, in a well-lit environment, can not see the light of the above is the turn signal and brake lights at the same time the situation, in this case, because the left rear turn light does not shine , Only the left front turn lights, so the turn light flash frequency increased. So, why the left rear brake light and why a light to flash it?