Air Bag Control Module: Description and Operation

Air Bag Diagnostic Unit (ADU) consists of a CPU, memory, auxiliary power supply and G-sensor and safing sensor. An auxiliary power supply is installed to ensure air bag deployment if battery power is lost in a collision.

The CPU not only initiates air bag deployment but also performs the SRS self-test. CPU initiates a test sequence every time ignition key is turned "ON" and the Air Bag Indicator is illuminated for 4 - 6 seconds.

When the self test sequence is completed and no fault is found, lamp goes out. If any failure is detected, the warning lamp will stay "ON" or flash to warn driver. Even while driving, the CPU continually monitors circuits and components of air bag system.

If a failure occurs within system while driving, the warning lamp is immediately illuminated. Details of those detected failures are stored in memory and can be retrieved with Kia Power Scan Tool.