B0070 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B0070 – Right Front/Passenger Roof Rail/Head Curtain Bag Deployment Loop Open

 

B0070 Possible Symptoms

 

Air Bag Warning Light ON

 

B0070 Possible Causes

 

Faulty Right Front/Passenger Roof Rail/Head Curtain Bag,Right Front/Passenger Roof Rail/Head Curtain Bag harness is open or shorted,Right Front/Passenger Roof Rail/Head Curtain Bag circuit poor electrical connection,Faulty Sensing and Diagnostic Module (SDM)

 

B0070 Description

 

The driver roof rail deployment loop consists of an inflatable restraint roof rail module – right and the roof rail module high and low circuits. A shorting bar used within the roof rail module connector shorts together both the roof rail module high and low circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. 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 roof rail module. The SDM performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a Diagnostic Trouble Code (DTC) will be stored in memory.