Thank you sir ghosthunter. That's clears it up a lot.

Doc Otep, your're right. POLICE nga po. Took down the dash cover under the steering wheel and found the control unit. Would it be possible for you to post or pm the wiring diagram? that would be a mega favor para po sana mapagana ko ulit. I would need to get a siren and actuators, though, as you suggested. Thanks po.