B1138 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1138 – Diagnosis Sensor Unit

 

B1138 Possible Symptoms

 

Air Bag Warning Light ON

 

B1138 Possible Causes

 

Faulty Diagnosis Sensor Unit,Diagnosis Sensor Unit harness is open or shorted,Diagnosis Sensor Unit circuit poor electrical connection

 

B1138 Description

 

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.