Chrysler Repair: 90 New Yorker anti-theft alarm wont disarm, straight pins, lock cylinder


Question
Alarm went on when I inserted key to unlock the car. Horn blew for three minutes and after that the lights (all) blinked for another fifteen minutes os so and then stopped. I could not disarm it during this whole time. It is a week now and it will not start at all. How do I get it to start, please? I am desperate. Thanks

Answer
Hi Samuel,
The problem is due to the wire that connects the key lock cylinder on either front door to the theft module is broken, probably at the hinge area. But fixing it may be a challenge so the alternative is to disarm the system at the theft module and then if you want to do without the theft system just disconnect it. Those are the choices, though if you didn't try lock/unlock at the other front door do that now, and if that works then you could use only that lock in the future to open the car and to disarm the system. But if neither lock will disarm the system then you have to either find the break in the wire for one door or the other and repair it or disconnect the system entirely.
Here is how to go to the module for the system and fake it out into believing that it has gotten the signal from one of the door switches to disarm. Then after you get the car started and WHILE the engine is running (a very important point) I would unplug the system and be done with it.
Here is what you need. Some basic tools (screwdrivers of both types of tips, some fine straight pins, a flashlight and maybe an adjustable wrench).
First you have to get to the theft module which is located above the glove box, in the dash. Begin by removing the underdash silencer pad on the lower edge of the dash so as to give you room to subsequently remove the glove box. Then notice around the glove box door opening that there are many screws that if you will remove them will allow the glove box to drop down behind the dash. If the wire for the internal light bulb prevents the box from dropping down remove the bulb fixture and disconnect the wire.
Then look above the opening for the now-removed glove box and you will see a crosswise bracket upon which is mounted one or more electrical modules with a plug for each. To get at the theft module you may need to remove the screws on either end of the bracket so that it drops down so you can get to the plug. The theft module has a 21-pin natural color connector. If you can't reach the plug, then you have to unbolt the both ends of the metal bracket to which it is attached so you can lower it the point where you can deal with the plug.
Once you locate that, do not disconnect the plug! Instead look for a dark green/orange wire (at cavity 8, which is the 4th from the left on the 10-pin upper row). Put a straight pin through the insulation of the wire so the tip of the pin touches the internal conductive wire. Then find  the wire that is colored black/light green (at cavity  10, 10 is next door to 8, on the right) and stick a pin thru its insulation. Now you touch the heads of those two pins together and then separate them . Watch for the alarm light on the dash to go off. If it doesn't, try again and then if it still doesn't go off try to reposition the pins sticking thru the insulation. Once you get the light to go off you can start the engine. Then WHILE the engine is running pull the natural color plug out of the socket on the module. That will end your problem. Then reassemble the parts in reverse order.
The pin touching/separating routine is identical to locking/unlocking the door key lock and so it should disarm the alarm system and allow you to start your car.
Good luck on this project. It is a common problem as the wiring ages on this great vintage Chryslers. Use the "rate the expert" tab to get back to me with a question if I am shown as "maxed out".
Roland