B1378

DTC B1378

Circuit Description

When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within the SDM itself.

These test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops.

The SDM inspects the wiring connection to the driver side air bag module by letting the perpetual current flow through the internal circuit and verify the resistance.

Conditions for Setting the DTC

The resistance of the driver side air bag deployment loop is higher than 3 ohms.