How do you make lights flash w/ keyless entry?

My friend has a '00 bmw 323i w/ the stock keyless entry.  He is upset because he can't really tell when the doors lock or unlock since the lights do not flash nor honk the horn.  Would I be able to tap in a wire (w/ a diode)  from the keyless entry lock wire to one of the parking lights or hazard lights? 

If I can, would you be able to tell me where these wires are?  Also, if you require a small fee, I'll send it through paypal.  Thanks for your help.

Hi metidogeno, if all else fails and the factory unit can not flash the lights, you can do the following to *flash the lights (or even the horn) once each time the doors are locked or unlocked.

85 to (-) lock wire or unlock wire (diode isolate)

**Parking lamp lead is the 4th wire from the left on the ribbon cable behind the parking light switch. When this lead is cut (opened) the lights wil come one, when the lead is reconnected (closed) the lights will turn off.

Door Lock WHITE/ Black (-)  Pin 20 of Module behind Glove Compartment, White Box 

If you want to flash the lights for unlock and lock, diode isolate both the lock and unlock wires and connect them to terminal 85 with the cathodes facing away from terminal 85. https://www.the12volt.com/diodes/diodes.asp

*The duration will be limited to the duration of the lock and unlock pulses. You can add more relays, a capacitor, and a resistor to extend the duration if desired (could also make the duration long enough to add a flasher) .... https://www.the12volt.com/relays/page5.asp

the12volt