Antitheft System - Additional Information and Operation

Group 61
Electrical

Bulletin Number
61 01 94 (3955)

Woodcliff Lake, NJ
August 1994
Product Engineering

This Service Information bulletin replaces (orange) S.I. 61 01 94 (3955) dated March 1994. It incorporates additional information concerning Anti-Theft Protection measures.

Please remove and discard S.I. 61 01 94 (3955) dated March 1994 from your S.I. binder.

SUBJECT:
Changes in Operation of Central Locking and Anti-Theft Protection

MODELS:
All produced 9/93 and later

General Information:
A variety of measures has been implemented to increase the level of AntiTheft Protection on 1994 model vehicles. These measures are listed below in the order in which they were introduced.

1. Arming and Disarming the Anti-Theft System (DWA IV):

As of Model Year 1994, the DWA IV system installed on the 540i, and on all 8 Series (E31) vehicles, can only be armed and disarmed from the remote control. This effectively prevents the vehicle from being started if the doors are forced open, and thereby increases the effectiveness of the DWA IV system.

Note:
In some cases, customers may desire the ability to disarm the DWA IV system by unlocking the vehicle by the door locks. If this is the case, the DWA IV control module can be converted (with V9.01 coding software) to arm/disarm with either the remote control or the door locks. If the DWA IV control module is replaced or recoded, the function is returned to "remote arming and disarming only."

Using Coding Diskette Version 9.01 or later, proceed to the "Conversion" selection to change the arming/disarming of the DWA IV Module. Refer to IDC Bulletin 001/94-15.

2. Drive-Away Protection:

As of 9/93 production, a Drive Away Protection circuit was incorporated into all 1994 model vehicles. This circuit consists of an output (high signal) from the General Module to the Engine Control Module to disable ignition and injection functions, if the central locking system is doublelocked and the ignition is turned on (KL15, "RUN" position). Refer to the supplements issued for the appropriate Electrical Troubleshooting Manuals for 1994 models for specifics, in the Engine Control Module (DME) sections.

3. Direct Central Locking System (ZV Direct):

During 12/93 production, changes to the function and operation of the central locking system were phased in. These changes are as follows:

- "Central Locking" (i.e., without double-locking) is only possible by means of the door lock buttons inside the vehicle, or via the remote.

- Only the double-lock function can be engaged when locking the vehicle with the key.

- Double-lock can be engaged from the trunk lock (or tailgate lock on Touring models); however, if double-locked, the vehicle cannot be unlocked from the trunk (or tailgate) lock. Only the trunk (or tailgate ) can be unlocked mechanically from this location. Mechanical unlocking of the trunk or tailgate will set off the BMW Remote Control Vehicle Security System (Alpine alarm), if so equipped and armed; however, mechanical unlocking from the trunk of vehicles equipped with the factory Anti-Theft System, DWA IV (540i and 8 Series vehicles) will not set off the alarm. In this case, the status LED will blink rapidly to alert the drive to re-lock the trunk.

- Vehicles equipped with the BMW Remote Control Vehicle Security System ("Alpine Alarm") can be locked, double-locked, or unlocked with the remote as before.

- Vehicles equipped with the factory radio-frequency remote locking/unlocking system (94 540i and 8 Series) are now double-locked only, if locking with door locks or with the remote.

- Microswitches at the door locks, and the General Module, have been modified to adapt them to these changes, resulting in changed Part Numbers. Refer to the appropriate Parts Microfiche for specifics.

4. Immobilizing Device (Starter Immobilization Relay):

During January 1994 production, an immobilizing de.vice (Starter Immobilization Relay) was installed in all 3 Series (E36), 5 Series (E34), and 8 Series (E31) vehicles.

The Starter Immobilization Relay is activated (and deactivated) by the Central Locking System, by the On Board Computer "Code" function (if so equipped), or by the vehicle's Anti-Theft System (DWA IV) (if so equipped). When active, the Starter Immobilization Relay prevents ignition or injection (by means of a high signal to the Engine Control Module) and prevents starter operation (by means of interruption of the KL50 circuit through an integrated relay). Modification to the General Module, lock cylinders, engine wiring harness, and the front section of the main wiring harness were necessitated to incorporate this system. Further modifications to increase the effectiveness of this system include the removal of the KL50 from the diagnostic connector and the installation of a tamper-resistant cover at the starter motor of vehicles with an easily accessible starter connection point.

Note:
The starter immobilization relays are different for manual transmission vehicles (P/N 61 35 8 362 101) and for automatic transmission vehicles (P/N 61 35 8 362 102). If a starter Immobilization relay for manual transmissions is installed in a vehicle equipped with automatic transmission, the starter can be engaged in all gear selector positions. If a starter lmmobilzation Relay for automatic transmissions is installed in a vehicle equipped with manual transmission, the starter cannot be engaged. Refer to the appropriate Electrical Troubleshooting Manual for specifics.

5. Starter Immobilization Relay (Starter Protection):

Beginning with June 1994 production, the starter Immobilization Relay incorporates an additional input and function. The part numbers of these relays were changed accordingly. The engine RPM signal (TD signal) from the Engine Control Module (DME) is now monitored, and the starter immobilization relay serves to protect the starter in the event of an ignition switch malfunction which did not disengage the starter control circuit (KL 50). If the TD signal exceeds 60 Hertz (corresponding to 900 RPM for an M60 engine, 1200 RPM for an M50 or M70 engine, and 1800 RPM for an M42 engine), the starter control circuit is interrupted. The circuit is restored when the TD signal falls below a frequency of 5 Hertz.

All other features of the starter immobilization relay introduced January 1994 are retained.

Refer to the appropriate ETM for specific details.