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The BMW Range
3 Series
E46
Key with Transponder
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<blockquote data-quote="jarance" data-source="post: 389691" data-attributes="member: 21"><p>I dont whether the following info is helpful or not. Extract from BMW WDS for E46.</p><p>Not sure whether the new key transponder can be coded to recognize by the existing EWS. </p><p></p><p><strong>Electronic Vehicle Immobilisation System EWS 3.3</strong></p><p>The EWS 3.3 serves as an antitheft alarm system and enables the start of BMW vehicles.</p><p></p><p><span style="color: Blue">A transponder chip is integrated in each of the vehicle keys. A ring coil is fitted about the ignition lock. The transponder chip is powered by the EWS3 control unit via this coil, i.e. no battery is required in the key. The power supply and data transfer take place in the same way as a transformer between the ring antenna (coil) at the ignition lock and the transponder chip integrated in the key.</span></p><p></p><p>The key then sends data to the EWS3 control unit. If this data is correct, the EWS3 enables the starter by way of a relay installed in the control unit and additionally sends a coded start enable signal via a data link to the DME/DDE.</p><p></p><p><strong>Components</strong></p><p>Key with integrated transponder chip</p><p>A chip which can both transmit as well as receive (transponder) is integrated in the key. This transponder chip obtains its power from the field built up by the ring coil and uses it to communicate with the EWS3 control unit. This means that no battery is necessary in the key for power supply. Every key or the transponder integrated in it is a unique part. The control unit can also differentiate between the individual keys. The key transmits and receives data from/to the EWS control unit.</p><p></p><p>If errors occur during communication between the EWS3 control unit and the individual keys, these errors are stored in the fault code memory - separate for each individual key.</p><p></p><p><strong>Ring coil</strong></p><p>The ring coil is fitted on the ignition lock and serves as an antenna for communication between the transponder chip (in the key) and control unit.</p><p></p><p><strong>EWS 3.3 control unit</strong></p><p>The EWS 3.3 control unit communicates with the key fitted in the ignition lock. If the communication procedure is correct and the key has sent all data necessary for identification and start enable to the control unit, the control unit detects whether the key is valid and has been released for use. If this is the case, it releases the starter relay located in the control unit and sends a coded enable signal via the data link to the DME/DDE.</p><p></p><p>The control unit can manage a maximum of 10 keys allocated to the control unit, i.e. a maximum of 6 replacement keys are possible.</p><p></p><p>The control unit can identify the individual keys thus making it possible to disable/enable individual keys and to store fault codes for each individual key separately in the fault code memory.</p><p></p><p><strong>Data link to DME/DDE</strong></p><p>The EWS3 control unit sends a coded enable signal to the DME/DDE via the data link. The engine cannot be started before this signal has been transferred.</p><p><strong></strong></p><p><strong>Engine control unit (DME/DDE) with coded start enable input</strong></p><p>The engine control unit (DME/DDE) only enables ignition and fuel supply if a correct enable signal is received from the EWS control unit.</p><p></p><p><strong>EWS-DME/DDE interface</strong></p><p>Identical variable codes are stored in the EWS 3.3 control unit and in the DME/DDE control unit. The value of these codes changes after every start procedure. Engine start is only enabled when the code sent by the EWS control unit agrees with the code in the DME/DDE control unit.</p><p></p><p>The control units are allocated only during initial programming of the DME/DDE control unit. The engine control unit then adopts the basic code of the EWS control unit.</p><p></p><p><strong>Important</strong></p><p></p><p>It is not possible to replace the DME/DDE or EW 3.3 control units for test purposes!</p><p></p><p>In the case of certain faults, it is possible that the variable codes in both control units deviate from each other. In these cases it is possible to match the variable codes by means of the service function ”EWS - DME/DDE matching”.</p></blockquote><p></p>
[QUOTE="jarance, post: 389691, member: 21"] I dont whether the following info is helpful or not. Extract from BMW WDS for E46. Not sure whether the new key transponder can be coded to recognize by the existing EWS. [B]Electronic Vehicle Immobilisation System EWS 3.3[/B] The EWS 3.3 serves as an antitheft alarm system and enables the start of BMW vehicles. [COLOR="Blue"]A transponder chip is integrated in each of the vehicle keys. A ring coil is fitted about the ignition lock. The transponder chip is powered by the EWS3 control unit via this coil, i.e. no battery is required in the key. The power supply and data transfer take place in the same way as a transformer between the ring antenna (coil) at the ignition lock and the transponder chip integrated in the key.[/COLOR] The key then sends data to the EWS3 control unit. If this data is correct, the EWS3 enables the starter by way of a relay installed in the control unit and additionally sends a coded start enable signal via a data link to the DME/DDE. [B]Components[/B] Key with integrated transponder chip A chip which can both transmit as well as receive (transponder) is integrated in the key. This transponder chip obtains its power from the field built up by the ring coil and uses it to communicate with the EWS3 control unit. This means that no battery is necessary in the key for power supply. Every key or the transponder integrated in it is a unique part. The control unit can also differentiate between the individual keys. The key transmits and receives data from/to the EWS control unit. If errors occur during communication between the EWS3 control unit and the individual keys, these errors are stored in the fault code memory - separate for each individual key. [B]Ring coil[/B] The ring coil is fitted on the ignition lock and serves as an antenna for communication between the transponder chip (in the key) and control unit. [B]EWS 3.3 control unit[/B] The EWS 3.3 control unit communicates with the key fitted in the ignition lock. If the communication procedure is correct and the key has sent all data necessary for identification and start enable to the control unit, the control unit detects whether the key is valid and has been released for use. If this is the case, it releases the starter relay located in the control unit and sends a coded enable signal via the data link to the DME/DDE. The control unit can manage a maximum of 10 keys allocated to the control unit, i.e. a maximum of 6 replacement keys are possible. The control unit can identify the individual keys thus making it possible to disable/enable individual keys and to store fault codes for each individual key separately in the fault code memory. [B]Data link to DME/DDE[/B] The EWS3 control unit sends a coded enable signal to the DME/DDE via the data link. The engine cannot be started before this signal has been transferred. [B] Engine control unit (DME/DDE) with coded start enable input[/B] The engine control unit (DME/DDE) only enables ignition and fuel supply if a correct enable signal is received from the EWS control unit. [B]EWS-DME/DDE interface[/B] Identical variable codes are stored in the EWS 3.3 control unit and in the DME/DDE control unit. The value of these codes changes after every start procedure. Engine start is only enabled when the code sent by the EWS control unit agrees with the code in the DME/DDE control unit. The control units are allocated only during initial programming of the DME/DDE control unit. The engine control unit then adopts the basic code of the EWS control unit. [B]Important[/B] It is not possible to replace the DME/DDE or EW 3.3 control units for test purposes! In the case of certain faults, it is possible that the variable codes in both control units deviate from each other. In these cases it is possible to match the variable codes by means of the service function ”EWS - DME/DDE matching”. [/QUOTE]
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