SDU System
WARNING: This page is about a different car, the 1995 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
Check battery voltage. If battery voltage is low, charge battery. If battery voltage is okay, inspect front impact sensors. See FRONT IMPACT SENSOR TEST under COMPONENT TESTING. If impact sensors are faulty, replace as necessary. If impact sensors are okay, replace SDU.