What's the INFINITI error code c1109?

The Anti-Lock Brake System (ABS) Module Actuator (Electrical / Control Unit) monitors the power supplies. The C1109 OBDII code on an INFINITI is set when the ABS Module power supply voltage is lower than normal. When the ABS is not functioning then the loss of traction, skidding, and hydroplaning are far more likely to occur under heavy braking conditions. The ABS on most vehicles is usually designed to give You plenty of warning signs when there is any trouble with the system. Being aware of these warning signs, and addressing the problem as soon as they arise will help ensure that Your ABS and vehicle remain functioning for maximum safety.