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SUPPLEMENTAL RESTRAINT SYSTEM(SRS) 8B-9 Diagnosis Air bag control unit diagnoses each function in the intervals of 250ms - 20 sec. during start-up or driving to prevent Air bag control unit diagnoses following items. - Ignition TR - Acceleration - Microprocessor, RAM and ROM - Watchdog - Shutdown Switch Diagnosis Condition Diagnosis Items Start-up (ignition ON) During Driving Lamp Blinking Mode There are 2 kinds of blinking mode 1. When system internal fault is found, the lamp will stay on. 2. The lamp will blink according to external fault and there are 2 blinking codes. Blinking code 1 (Squib resistance fault in the driver’s air bag squib line) Blinking code 2 (Squib short on plus and minus in the air bag squib line) Lamp blinking code is as follows. The last blinking will be within 0.5 sec. and 1 cycle of blinking will be repeated every Blinking Code 1 (Sec.) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Blinking Code 3 (Sec.) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 - Squib resistance - Squib line short to battery and ground - Energy reserve system - Lamp output - Battery voltage - ASIC communication - Arming sensor - ASIC overheating - RAM and W/D - EEPROM |