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For a 1988 - 1993 W201 you can read diagnostic codes from sockets 1 and 6 on X11/4. If you don't have a code reader you should be able to short the two sockets for 2 to 4 seconds, with the ignition on, and then read the flashes from the SRS instrument light. The codes are:
1 - No fault
2 - SRS control module ()N2/2)
3 - Driver air bag
5 - Driver seat belt buckle
6 - Front passenger seat belt buckle
8 - Voltage supply (circuit 15R)
9 - Warning lamp (A1e15) defective
10 - SRS - Control module (N2/2) was activated
To erase the codes, short the sockets for 6 to 8 seconds. Note you must erase each code individually.
You may not be able to erase code 10.
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