B0021 CHEVROLET – Passenger Seat Side Air Bag Deployment Loop

B0021 CHEVROLET Possible Symptoms

Air Bag Warning Light ON

B0021 CHEVROLET Possible Causes

Faulty Passenger Seat Side Air Bag,Passenger Seat Side Air Bag harness is open or shorted,Passenger Seat Side Air Bag circuit poor electrical connection,Faulty Sensing and Diagnostic Module (SDM)

B0021 CHEVROLET Description

If a malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored in non-volatile memory. During a side or frontal crash of sufficient force the inflatable restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop in order to deploy the passenger seat side air bag. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. A shorting bar is used within the passenger seat side air bag connector which will short together both high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the air bag during servicing.