I recently purchased a used 2003 Saab 9-3 2.2 TiD Arc and first time getting in the car I get a error in SID "Anti Theft Failure" then often times I get one "Lock system failure".

One night the car's alarm kept going off at night so I had to use the key to lock it but my trunk stays open due to no center locking if you use the key.

The car doesn't seem to have a Siren Box. It uses the horn, I searched for the siren box or alarm module but I can't find it, it's not in the trunk nor the wheel well.

Can someone help me locate the module that controls the alarm? I have one error on the computer regarding the alarm : B3812 and for the back passenger door: B3817, there were one or two more but I managed to delete them (?). Also the locks work fine, rarely the lock in the back doesn't work properly but it's a 1/10 situation.

Can I use Tech2 to disable the alarm horn of the car? Thanks.