Car Alarms: factory alarm issue 1995 infiniti q45, 1995 infiniti q45, infiniti q45

Question
I recently purchased a 1995 Infiniti Q45. It runs great and is in great shape with a few minor quirks. Biggest issue for now is the factory alarm. The car came with only the master key, no spare and no remote. It works perfect about 90% of the time but occasionally I will unlock the driver's door with the key and the alarm will still go off when I open the door. A few times I just shut the door, put the key back in, turned it again, and the alarm went off. However, the last time, that didn't work at all so the car wouldn't start. I waited the three minutes or whatever the owner's manual suggested, the alarm finally timed out but the car still wouldn't start. Basically I just had to keep setting it off and putting the key in the door until it finally worked. During those attempts I tried putting the key in the trunk and the passenger's door as well since the owner's manual said any of these should work to disable it with the master key...none of them worked. I ended up stranded for about 30 minutes and hoping it would just finally take and eventually it did. Since then I haven't locked the doors at all for fear of setting it off again, but I'd really like to be able to in the future. I don't really care if the alarm works at all so is there some way to just disable it altogether? Thanks for any help!

Answer
Please be more descriptive if possible.

"GOING OFF?"

I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Ok let's clear up the terminology glitch here.

1. FACTORY/OEM alarm = Part of the original schematics
and plans from the manufacturer.
(horn honk, head lights flash, Starter may crank and
die, no spark)

2. DEALER INSTALLED alarm = Just that. Once the vehicle
is brought to a dealer, the dealer sub contracts the after market
security out.
(horn might honk, siren and parking lights flash, starter kill relay,
no start, no crank, just dead.)

3. AFTER MARKET alarm: Same as #2 but Customer IS AWARE that
the system was put in at the dealership, but may not
be informed of the brand name, or even what it's
total capabilities are.
(siren & parking lights flash, starter kill)

Which one applies to yours?

RM/ALARMTEK
CARALARMMAN.COM