B1C18 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1C18 – Passenger Active Headrest Control Circuit Low
B1C18 Possible Symptoms
Air Bag Warning Light ON
B1C18 Possible Causes
Faulty Passenger Active Headrest,Passenger Active Headrest harness is open or shorted,Passenger Active Headrest circuit poor electrical connection,Fault Occupant Restraint Controller (ORC)
The Passenger Active Headrest signal circuit is driven by a solenoid that also uses a diode in parallel. The single electrical component of the Active Headrest (AHR) unit is the latch-release solenoid. The solenoid is connected by a 2 way pigtail wire and harness connector. The pigtail wire and 2 way connector are routed through the center of one of the headrest support posts and down through the guide sleeve to the interior of the seat back, where it connects to the seat wire harness. The solenoid is grounded at an independent dedicated ground. The AHR components itself cannot be repaired. If damaged or ineffective, the AHR must be replaced as a new assembly. If upon inspection the AHR has deployed it can be reset following the proper reset method.