E31 Anti theft module
 

Does anyone know where the alarm moduale is on a 91 850i?

ask on the specialized E31 8 series forum at BimmerBoard BMW Forums and the world's best online BMW community. Sharing the knowledge!
these guys can tell you as they own E31.

Do you get an alarm while car is parked?

Yes. If the car gets wet or cold( below 60 degrees ) The alarm will sound and nothing on the inside of the car works except for the stereo. Doors will not unlock either. I've gotten to the point where I put a space heater in it over night.:(

I found the following:
Group 65 65 20 96 Woodcliff Lake, N.J. Jan. 1997
Sound Systems, Cruise Product Engineering Alarms, Monitors
SUBJECT: Anti-Theft System (DWA) False Alarm caused by Inclination Sensor (NAG)
MODEL: 5 Series (E34, E39), 7 Series (E32, E38), 8 Series (E31)
Situation: The Anti-Theft System (DWA) may sporadically trigger false alarms under two specific circumstances, as follows:
(A) Approximately 30 seconds after arming DWA
(B) Sporadically, usually at the same parking location
Cause: (A) Mechanical reverberation of the inclination sensor (NAG).
If a door on the vehicle is slammed shut, the mounting of the inclination sensor (NAG) can vibrate. If the alarm is now armed while the sensor is still vibrating, the DWA Control Module stores a random reference position. After the normal delay of approximately 30 seconds, the DWA Control Module evaluates the signal from the NAG (which has now quit vibrating) and detects a change of position. This now triggers the alarm.
(B) External electromagnetic radiation that acts on the inclination sensor.
Note:
In both cases, the alarm counter will store the "inclination sensor" as the location that triggered the alarm.
Vehicles Affected: 5 Series (E34, E39), 7 Series (E32, E38), 8 Series (E31) - vehicles equipped with DWA and produced prior to July 1996.
Correction: In the event of customer complaint (only affected vehicles equipped with DWA), proceed as follows:
1. Connect the DIS Tester to the vehicle.
2. E38, E39 vehicles: Under "Body Electronics", select "ZKE" (Central Body Electronics) and then "Anti-Theft Alarm".
E31, E32, E34 vehicles: Select "18 Burglar Alarm System".
3. Select "Service Functions".
4. Select "DWA Alarm Counter".
5. If the majority of entries are for the inclination sensor, identify the index number of the sensor itself (index number is printed on the label of the sensor).

The NAG is mounted on the left- or right-hand side of the luggage compartment, depending on the model. Refer to the appropriate Electrical Troubleshooting Manual (Component Location).
6. If the inclination sensor (NAG) bears an index number of 10 or lower, it must be replaced with an NAG bearing an index number of 11 or higher.

Note: Depending on the equipment level of the vehicle, the NAG may be mounted behind various accessories such as CD Changer, Cellular Phone Transceiver, etc.
Identify the Index Number by using a mirror (see illustration) before removing the NAG.

Parts Information: Application Part Number Quantity
E31, E32, E34 65 75 8 366 214 1
E38 65 71 8 368 167 1
E39 65 75 8 367 604 1

Defect Code: 65 75 20 14 00
http://members.roadfly.org/smoothy/False%20Alarm.pdf

N1 = DWA Module
X301 connector 26 pins, white
X395 connector 1 pin, yellow

so look into the trunk behind the cover, right hand side.

Wow! Thanks a bundle!!

Would you happen to have a diagram showing where the general module is? I need to program a new fob. Ive taken apart almost everything.

should be in here 01 51 9 750 037 En - 001

Specialized dealers?