B0043 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B0043 – Driver Frontal Deployment Loop Stage 2 Voltage Out of Range


B0043 Possible Symptoms


Air Bag Warning Light ON


B0043 Possible Causes


Faulty Steering Wheel Module Coil,Steering Wheel Module Coil harness is open or shorted,Steering Wheel Module Coil circuit poor electrical connection,Faulty Steering Wheel Module


B0043 Description


The driver deployment loop consists of the following components: – A dual-stage inflatable restraint steering wheel module – The inflatable restraint steering wheel module coil – The steering wheel module high circuits for both stages 1 and 2 – The steering wheel module low circuits for both stages 1 and 2 There are 2 shorting bars used within the steering wheel module coil connector. These shorting bars short together both stages of the steering wheel module high circuit and the steering wheel module low circuit when the connector is disconnected. This helps prevent unwanted deployment of the inflator module during servicing. During a frontal crash of sufficient force the inflatable restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop. This flow of current will deploy the steering wheel 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 DTC will be stored in memory.