Chery QQ Service Manual
Chapter 8 Air Bag System
Maintenance and use of air bag
Diagnose
Inspection of SRS diagnostic system
When the SRS is powered on, airbag SDM will turn on warning light and start a self-checking,
during which the warning light will flash for 6 seconds with a frequency of 1Hz. Any fault
detected by SDM will activate airbag warning light, and the fault will be stored to SDM
memory. SDM will check SRS fault each time it is powered on. A fault will be marked by
SDM if it is detected consecutively for five times. A fault diagnosis testing cycle lasts for 400
ms, therefore it takes SDM 2 seconds (400ms X 5 times) to confirm a fault. If a marked fault
continues, the warning light will keep on, this is called a “current fault”. If a marked fault
does not appear in the following 25 consecutive testing cycle (400ms X 25 = 10 seconds), it
will be unmarked, this is called a “historical fault”.
Diagnose with Diagnostic tester
Diagnostic tester reads data in SDM memory for continuous data communication. A
diagnostic tester is able to read fault code in memory and clear part of stored data after
maintenance, but is unable to clear internal faults such as collision record and arithmetic data
fault.
To properly operate the diagnostic tester, first turn off ignition switch, and connect diagnostic
tester with OBDII connector, then turn on ignition switch. Next steps please refer to
instruction manual of diagnostic tester.
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