Key with Transponder
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kby88
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simonso;475919 said:Guys i've just purchased a bmw key online and it says the key comes with built in transponder, what does that mean?
PS : I ordered the diamond shape key w/o transponder, but the key got lost in mail so they send me this.
bro, how to purchase the key online?
and how much?
simonso
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Jarance, when i got the car the alarm isn't working.
Apparently I was too annoyed with it and never find out that it could be fixed. Then i've got myself a GSM / Alarm system.
After a while I got it check and the electronics mechs said my built in car alarm is working, the key is probably not.
So basically I thought the internal alarm wasn't working properly so I've got a third party alarm system which my partner has. It got me taken away by its functions and safety features.
Apparently I was too annoyed with it and never find out that it could be fixed. Then i've got myself a GSM / Alarm system.
After a while I got it check and the electronics mechs said my built in car alarm is working, the key is probably not.
So basically I thought the internal alarm wasn't working properly so I've got a third party alarm system which my partner has. It got me taken away by its functions and safety features.
When you mentioned that you first thought that the alarm is not working, do you means the following:-
1. Key cannot open/close the door by remote but you can open the door with the diamond shape key.
2. You can start the car with the diamond shape key.
3. You can open/close the door with the dashboard "Open/Close" push button.
How many keys did you get when you bought the car?
1. Key cannot open/close the door by remote but you can open the door with the diamond shape key.
2. You can start the car with the diamond shape key.
3. You can open/close the door with the dashboard "Open/Close" push button.
How many keys did you get when you bought the car?
simonso;476207 said:
You should have 2 diamond shape keys and 1 valet/wallet key.
and you should rotate the keys to charge it.
The problem you might be facing it that you key is out of syn with the GM5 module. Try to resyn it back. I have posted the procedure before. May be you should try it.
simonso
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jarance;476242 said:
The dealer only gave me 1 Diamond shape and 1 valet key. I hardly use the valet key so i guess I shall use it tomorrow.
Ok bro i'll check out our write up about re-syncing it back. Thanks. :top:
Oh another thing, they key is sealed pretty tight - i've got no idea how to open it as i'm afraid i might just break it.
simonso;476687 said:
You should have something like this.
Look like one of your key is missing..
The original key are glued together at the covers. You have to cut the edges with a sharp knife to open it.
Better not try to open if you are not sure.
Anyway, here is the resyn procedure if you cannot find it.
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.
Electronic Vehicle Immobilisation System EWS 3.3
The EWS 3.3 serves as an antitheft alarm system and enables the start of BMW vehicles.
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.
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.
Components
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.
Ring coil
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.
EWS 3.3 control unit
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.
Data link to DME/DDE
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.
Engine control unit (DME/DDE) with coded start enable input
The engine control unit (DME/DDE) only enables ignition and fuel supply if a correct enable signal is received from the EWS control unit.
EWS-DME/DDE interface
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.
Important
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”.
Not sure whether the new key transponder can be coded to recognize by the existing EWS.
Electronic Vehicle Immobilisation System EWS 3.3
The EWS 3.3 serves as an antitheft alarm system and enables the start of BMW vehicles.
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.
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.
Components
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.
Ring coil
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.
EWS 3.3 control unit
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.
Data link to DME/DDE
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.
Engine control unit (DME/DDE) with coded start enable input
The engine control unit (DME/DDE) only enables ignition and fuel supply if a correct enable signal is received from the EWS control unit.
EWS-DME/DDE interface
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.
Important
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”.
azeL_Inc
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Jarance, since we re talking about key, i think i might slip in some questions 
FYI, i got all 4 keys when i bought my car. But, I wonder, when i first got my car, the remote seems to be working if i press it quite far from the car,maybe around 100-200m.
But lately, seems the range has been shortened. sometimes, i really need to get really close to the car (5-10meters) before the remote is working. Yes, i always rotate the key to charge the battery. But the 2 remote is kinda same, close only can get it work.. I cant recall when it first become like that, but do you think it got something to do with the tint of my car? coz i have no idea where the receiver is? maybe tint block the signal?
FYI, i got all 4 keys when i bought my car. But, I wonder, when i first got my car, the remote seems to be working if i press it quite far from the car,maybe around 100-200m.
But lately, seems the range has been shortened. sometimes, i really need to get really close to the car (5-10meters) before the remote is working. Yes, i always rotate the key to charge the battery. But the 2 remote is kinda same, close only can get it work.. I cant recall when it first become like that, but do you think it got something to do with the tint of my car? coz i have no idea where the receiver is? maybe tint block the signal?
azeL_Inc;477819 said:Jarance, since we re talking about key, i think i might slip in some questions
FYI, i got all 4 keys when i bought my car. But, I wonder, when i first got my car, the remote seems to be working if i press it quite far from the car,maybe around 100-200m.
But lately, seems the range has been shortened. sometimes, i really need to get really close to the car (5-10meters) before the remote is working. Yes, i always rotate the key to charge the battery. But the 2 remote is kinda same, close only can get it work.. I cant recall when it first become like that, but do you think it got something to do with the tint of my car? coz i have no idea where the receiver is? maybe tint block the signal?
I doubt it have any thing to do with the tint as my car have rike cool tinting done on it.
Our key is operated by radio signal and not by infra red.
If you think it is the tint that is affecting your signal, try to operated the remote with ALL the windows winded DOWN.
andrew wong
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bro. I try initialize my key. But after the it the key do not work anymore. Cant lock and unlock. How to get the key back to work. Pls advise. Thanks bro.
