B1109 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1109 – Diagnosis Sensor Unit
B1109 Possible Symptoms
Air Bag Warning Light ON
B1109 Possible Causes
Faulty Diagnosis Sensor Unit,Diagnosis Sensor Unit harness is open or shorted,Diagnosis Sensor Unit circuit poor electrical connection
The Air Bag Diagnosis Sensor Unit detects the whole SRS electrical system and displays the malfunction either by illuminating or blinking the air bag warning lamp in the combination meter. The Air Bag Diagnosis Sensor Unit detects a shock that exceeds specified level and watches such systems as the driver and passenger air bag, side air bag, curtain air bag, pre-tensioner seat belts and Occupant Classification System (OCS) operate properly. The Air Bag Diagnosis Sensor Unit contains the ?????sensors for both frontal and side collisions and spare battery function in case of main battery damaged in a collision.