cannot activate chirps

First post,
First off, I do not know the model # of the alarm(no identifiers), but it is similar(in appearance) to an Audiovox APS-25-CL.
Has small cover revealing (4)DIP switches, Edge connector(13 pin) on bottom, (3) connections on left side(Door locks, LED and Valet).
I have the unit set up with only the door switches But has (2) other channels.
On with the problem:
When I arm or disarm the system I get no chirps from siren, but if sitting inside I can hear the brain box beep once for lock and twice for unlock. I do get (3)chirps if I try to arm it with the door open and (4) chirps if I disarm after intrusion, so I know the siren is accepting chirps.
I tried the Audiovox method of activating chirps(Key on, key off, toggle valet on-off-on-off-on-off) and receive no chirps. I tried it fast(<3sec.) and slow(<10sec.)
When I go into programming there appears to be only 3 levels of programming. After the third program it sounds the alarm for about 1-1.5 seconds. I also do not hear the chirp during programming.
Anyone have an idea as to the problem, of possibly a solution?

Sorry, forgot vehicle ID:
1991 Chevy full size Blazer

Do you have any idea what the dip switches are for?

Not sure, but on an APS25CL they are as follows;
AUTO LOCK / UNLOCK : DIP SWITCH #1
PASSIVE / ACTIVE DOOR LOCK SELECTION: DIP SWITCH #2
PASSIVE / ACTIVE ARMING SELECTION: DIP SWITCH #3
VOLTAGE SENSE / HARDWIRE SELECTION: DIP SWITCH #4

Just a note: I have not touched the dip switches.

After more google time I have found one that looks more like mine.
Pursuit PRO 9243.

Anyone have any info on this model? IE: owners man., install man., programming man.

Avox just sent me the install and owners manuals.
I will post them in the members downloads area for all to share.
Regrettable this did not help in my getting the chirps to work during arm/disarm.

I wonder if there might be a compatibility problem with the siren.
I replace the one that was there(smashed and rusted) with a DEI 514N.
has anyone had issues with this?

Disconnect the siren from the alarm, touch the siren's power wire to the battery briefly.  Does it chirp?  If not, touch it to the battery long enough to have the siren begin producing sound.  How long does that take?

Pretty much instantaneous.
I am going to hook up a small piezoelectric buzzer I have tomorrow and see if it is getting the signal (I'd use my meter, but it suffered a fall last week). If that fails I guess I will just have to live without the arming chirps, as the alarm itself and door locks work.
Guess I need not sweat the small stuff.

If it chirps when you connect it to the battery and doesn't when you have it connected to the siren output on the alarm, then i'm willing to bet that its the output of the alarm that is the problem.  when you get a good DMM check the siren output of the alarm to verify that you indeed are getting 12V+ on that wire. 

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...half of the truth can be worse than a lie. <----Roger Russell said that..

As stated in the first post The alarm go off(sounds) just fine and I can hear chirps for door open during arming and intrusion, just not during arming and unarming. I also get no chirps or light flash after :key on - key off - toggle valet 3X

Solved (I think)

It appears that the output from the alarm chirps were below the cut in threshold of the siren.
My workaround----Wired the output through a 12v relay to the siren.

Now, I don't know if this is due to the alarm being worn out, or if it's that the new siren is just too demanding for such an old system. IE: old standards versus new standards.

Thanks to those that offered help