I can tell you it perfectly because i had the same problem. Its the alarm code for the airbag system. 1 long flash and 1 short means there is a fault in the driver side seatbelt system. This is most likely due to him removing the seat belt retractor. Which he can solve very easily by putting a 2.2 ohm resistor into the plug.
Hi, that is good to know, thanks. The airbag and the other warning light got activated after installing MS, strange considering its a PNP. The airbag should not be active with the bucket seat and harness anyways. The seatbelt is still there but might as well just remove it.