Circuit/System Description

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The driver deployment loop consists of a inflatable restraint steering wheel module, the inflatable restraint steering wheel module coil, steering wheel module high and steering wheel module low circuits. There is a shorting bar used within the steering wheel module coil connector which will short together both steering wheel module high circuit and steering wheel module low circuit when the connector is disconnected, this will help to 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 in order to 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 diagnostic trouble code (DTC) will be stored in memory.