nissan 1993 maxima.
Not the original owner.
the manual does not have the mastercode to reset all the codes.
the alarm went off for 10-15 minutes then it stopped by itself and now when l turnkey on ignition it does not turn as if the security system disabled it. This is my moms car and she was visiting and l need to get it working asap. please anyone help me. this is the only car she has.

Either turn & hold the trunk lock to unlock 2 seconds or drivers side door lock toward unlock two seconds. That turns of the alarm & the security light should turn off. OR remove the negative battery terminal (two people) u get in turn the key to crank position have Old Sparky drop the negative terminal back on *SPARK* & the car should crank up & run. After the alarm went of the starter interrupt relay was energized. This may also cause the battery to run down. Key pad push button lock & unlock feature may need the 5 digit code if the system still lights up & beeps & only if the power locks all function properly. The smart entry module is to the right of the glove box with the box removed u can see it behind the dash.