Diagnosis

DIAGNOSIS

The diagnosis of the EWS system is supported through the use of the diagnostic program "electronic immobilizer EWS" (available on DIS as from CD-ROM "Program V3.0").

Troubleshooting is considerably simplified by selecting the fault symptoms and implementing the relevant test module.

In addition, further functions are available for recognizing the validity of an existing key (key test) and to check for the correct data synchronization between the EWS control module and DME (EWS-DME/DDE synchronization).

In the event of complaint, use the following procedure:

^ Connect the DIS to the diagnostic socket on the vehicle

^ Switch on the ignition with a valid key (turn key in ignition lock to position 2) Select series

IN THE CASE OF E31/34/36 SERIES:

^ Select the EWS control module under "16 - ELECTRONIC IMMOBILIZER EWS" on the page, "Diagnosis of CONTROL UNITS."

^ Hard copies of schematics are available.

IN THE CASE OF E38 SERIES:

^ Identify the vehicle. Then follow the page "Diagnosis vehicle identification."

^ Press the key "Select function." On the "Diagnosis selection of function and component" page, select "EWS system" in the case of drive train or body.

^ Note:
The diagnosis program is continued by pressing the "test plan" key.

^ The "documentation" key covers the function description, schematics, pin assignments and installation Sites of EWS components.

ENCODING/PROGRAMMING

Encoding plays an important role in the EWS system.

The EWS control module must always be encoded after replacement.

When replacing the EWS control module, follow this procedure:

^ Connect the DIS or MoDiC to the diagnostic socket on the vehicle

^ Switch on the ignition with a valid key (turn key in ignition lock to position 2)

^ Select series

^ Select "New encoding"

^ Select "16 EWS"

^ Select "1 replace control unit"

^ Select "1 readout of data from faulty control unit"

The encoding procedure begins with the selection of the data from the faulty EWS control module still installed in the vehicle.

The data contained in the defective EWS control module are stored temporarily in the DIS or MoDiC (the data are still stored even after the DIS or MoDiC has been disconnected). After replacing the EWS control module, the data in temporary storage should be entered in the new EWS control module and the EWS control module encoded:

Select "Transfer data to new control unit and encode new control unit" in path "16 EWS."

Subsequently, the stored data are transferred and the new EWS control module is encoded.

WHEN REPLACING THE ENGINE CONTROL MODULE DME

After replacing the engine control module:

^ Select "DME version code" or "DME programming" in the MoDiC in accordance with the installed engine control module.

^ Select "EWS-DME/DDE synchronization (vehicles as from 1/95)" and commence synchronization.

The synchronization is subsequently carried out.

The synchronization is carried out automatically when programming a DME control module.