Help! Door Locks
 

Our '02 X5 door locks are not working properly. This morning, the door would not unlock with the key (we use the master key without keyless function as the key battery died out last year). Anyhow, since we could not access the car, we got a locksmith to open the vehicle with a coat hanger.

Now, the central lock button seems to be dead. The doors doesn't unlock or lock when the button is depressed. The rear doors can't be opened as they are still locked. The passenger door can only be unlocked from the inside when you pull the handle. The driver's door can only be locked and unlocked from the inside.

The vehicle does start up and drive. I drove it for 30 min hoping it may reset something...no luck.

Thoughts?

checked fuses?

Can you let me know location of fuse?

i can't right now, too late to go to garage... lol... there two main banks of fuses, one is in the glove compartment, when you open the lid, the fuses are under a plastic cover stuck to "ceiling" of the compartment. turn two thumb knobs and you will see it. also, on the cover is the legend for fuses.
the other bank is in the back, on the right side of the trunk area is a carpeted cover with a handle, as you pull it open, the bank of fuses is there, along with legend...
assuming that you have the X5 - can you put down the year and model (if you to put down the last 7 of vin, i can get you complete list of factory installed option on your car)
once you find the fuse, pull it out and check with a tester, not just visual...

EDIT: nevermind, you did say it is a '02 X5 - tells you how late it is and how sleepy i am... lol... keep us posted of your progress

Checked the fuses in glove box location....all appear to be fine. Still, central locking button on center console is dead. When depressed...nothing happens. We can only enter the X5 through driver and/or passenger side. Lock and unlocking for both front door can only happen from inside manually.

Rear doors are still locked and cannot unlock or be opened.

Thoughts?

well, it is definetely an electronic/electrical issue... since the rear doors are double locked (can't be opened froom inside), is the gas cover flap locked too? If it is, there is a pull string on the inside that should allow you to open the flap...

the locks are controled by EWS module, if I am not mistaken... So, either the EWS went belly up, or it does not get the juice... If it went belly up, replacement, while availble on a secondary market, MUST be coded to the car by a dealer (or a reputable indy), in order to assure that the keys are matching to the car and that the odometer reading is not throwing an orange "tamper" dot - then you will not be able to sell the car... EWS, AFAK, is one of the many modules storing the odometer reading.

So, lets hope that the module is not getting the juice... let me pull some diagrams and see where it is being fed from...

Meanwhile, guys, we have a lot of folks on this forum who know their stuff, c'mon guys, chip in!!!

thanks for the info..... doing more search within the forum, looks like there is another set of central lock fuse in cargo area. I will have to climb through the back (rear door and hatch are doubled lock) and look at the fuse box.

Dumb question: do you think the battery is too weak to power the central lock system? The car does start-up.

well, weak battery is known for throwing some weird electronic gremlins, and if the battery is aroound 3-5 year mark, it might be a good time to look into replacing it... for the time being, let's see if the other fuse would help...

Check the battery. I had a strange issue with GT1 when I had low voltage. My EWS module would not power on, causing all sorts of issues. This happened when I didnt use it for a while. After charging it, and now driving every day, EWS module always works.

Well, according to the documentation, if the EWS is dead, then car con not be started... interesting...


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 loop antenna (coil) at the ignition lock and the transponder chip.
The key then sends data to the EWS3 control unit. If these data are correct, the EWS 3 control unit enables the starter by means of a relay located in the control unit and additionally sends a coded start enable signal via a data link to the DME/DDE. These procedures may result in a start delay of up to half a second.
Components

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 engine start 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. Start enable only takes place if the code sent by the EWS control unit agrees with the code calculated 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 rare cases, it is possible that the variable codes in both control units deviate from each other. In these cases, it is possible to reset both codes to the initial value via the service function DME(DDE) EWS III matching.
Key identification and start procedure

The following procedure takes place after inserting the vehicle key in the ignition lock:

• The transponder in the key is powered via the loop antenna and sends the key data to the EWS3 control unit.
• The EWS3 control unit checks the key data to ensure it is correct and only then sends an enable signal to the starter.
• The EWS3 control unit sends the variable code to DME/DDE. There, the variable code is checked against the saved variable code; if they match, the fuel injection is released.
• After the engine has started, the EWS3 control unit generates new key data (change code) and transfers them to the transponder in the key.
• A new variable code is also created and stored in the DME/DDE control unit.

Fault recognition in engine control unit

The following faults are monitored in the engine control unit:

• Interface, i.e. line to EWS control unit: In this case, the check is carried out in order to establish whether a signal is received and whether this signal is not subject to excessive interference.
• Variable code: A check is conducted as to whether the variable code which is sent by the EWS control unit agrees with the value calculated in the DME(DDE) control unit.

Engine start is inhibited if a fault is detected.

this might be helpful... just need to decipher the gibberish to get to the root...

EWS positive supply

Explanation

For safety reasons, the EWS control unit is supplied redundantly with power via terminal 30 and terminal R.
Failure of terminal 30 or terminal R does not cause a noticeable malfunction while starting the engine. Diagnosis with the EWS control unit is also still possible.
Terminal 30 defective

If terminal 30 fails, diagnosis with the EWS control unit is then only possible with terminal R switched on (ignition lock in position 1 or 2).
In addition, failure of terminal 30 results in failure of the radio remote control. The reason for this lies in the following function sequence:
When terminal 30 is free of defects the EWS control unit detects when the key is removed from the ignition lock after switching off terminal R. This status is sent via the K-bus to the central body electronics control module (ZKE). The control module executes the button commands of the key-chain transmitter only when the ignition key is not inserted in the ignition lock.
When terminal 30 is defective the EWS control unit can no longer detect the key status after switching off terminal R. The key status ”key inserted in ignition lock” therefore remains stored in the central body electronics control module. Consequently, no key commands are executed.
Troubleshooting

The power supply of the EWS is checked using test module B6135_00003 supply, K bus.
The status of terminal R can be checked using the diagnostic function 'Read status'. To check terminal 30, the data communication between the tester and EWS control unit is monitored with terminal R switched off. If communication with the EWS control unit is no longer possible with terminal R switched off, this indicates a fault in the area of terminal 30 (fuse or cable).

gee... i hate piece mealing but this is how the information is coming by me... lol


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”.
Influencing variables

P/N input for automatic transmission

Whether the vehicle is equipped with automatic transmission is defined in the coding.
On automatic vehicles, a start procedure is enabled by the EWS3 only if the selector lever is in position P or N.

The EWS3 control unit receives the information with regard to the selector lever position twice:

• Via a data link
• Via the K-bus

If the information ”selector lever in position P or N” is sent only via the K-bus but, due to a fault, not via the data link, noticeable start delays within the range of 1 - 2 s can occur.
”Central locking secured” signal

The EWS3 control unit receives this information via the K-bus.
If the EWS3 control unit receives the ”central locking secured” signal from the general module, in ignition lock position 1 (terminal R), the EWS sends back a signal via the K-bus which unlocks the central locking.
Afterrunning time

Important
For safety reasons, the EWS3 control unit features a code-dependent afterrunning time (approx. 10 seconds). It begins when the ignition lock is switched to 0 position. Within this afterrunning time start with any mechanically fitting key is enabled.
Key identification and start procedure


The following procedure takes place after inserting the vehicle key in the ignition lock:

• The transponder in the key is powered via the loop antenna and sends the key data to the EWS3 control unit.
• The EWS3 control unit then checks the key data to ensure it is correct and only then sends an enable signal to the engine management system and starter.
• After the engine has started, the EWS3 control unit generates new key data (change code) and transfers them to the transponder in the key.
• A new variable code is also created and stored in the DME/DDE control unit.

Changing individual components

Key

Replacement keys can be obtained from a sales point only via a BMW dealer where one of the 6 replacement keys fitting the vehicle is programmed. This key is not a copy of the lost key, but rather a new key.
A total of not more than 6 replacement keys suitable for the installed EWS control unit can be made and handed over.
There is a noticeable start delay of 1 - 2 s when a new key is inserted in the ignition lock for the very first time. From then on, the start procedure should take place without delay.
Lost keys must be blocked by means of diagnosis. Refer to ”Special features of the diagnosis program”.
CAUTION!
Every request for a key is documented so that enquiries from insurance companies and authorities can be followed up.
Procedure for loss of all 10 keys

A new EWS control unit is required if all 10 keys are lost.
By providing all the necessary data, it is possible to obtain a new EWS control unit from a BMW dealer and the new transponder keys allocated to it with the previous mechanical key code.
EWS control unit


The following procedure should be adhered to when replacing the EWS 3.3 control unit:

• Before replacing the EWS3 control unit: Leave defective control unit installed in vehicle and in the coding program (Encoding ZCS) select point ”1 New coding - 1 Replace control unit - 1 Read out data from defective control unit”. Coding data and vehicle-specific data is read out of the EWS control unit with this part of the program and buffered in the MoDiC or DIS tester.
• Now install new EWS 3 control unit.
• After replacing the control unit: Encode new EWS 3 control unit with coding program selection point ”1 New coding - 1 Replace control unit - 2 Transfer data to new control unit and encode control unit”. The buffered data is now transferred and EWS - DME/DDE matching is carried out.

Note
The procedure described above must be adhered to as all the data necessary for vehicle identification is also stored in the EWS control unit. It will be necessary to do without the data readout from the old control unit only if the EWS 3 control unit no longer has diagnostic capabilities.

Proceed as follows in this case:

• Install new EWS control unit in the vehicle and encode with the encoding program and selection point ”1 New coding - 2 Re-encode control unit”.
• Then carry out matching with selection point ”EWS - DME/DDE matching”.
• In this procedure, the vehicle data necessary for automatic vehicle identification cannot be written to the EWS control unit.

Replacement of engine control unit (DME/DDE)

After replacing the engine control unit, ”EWS - DME/DDE matching” must be conducted with the coding program or in the diagnosis program.
Important
The ignition must then be switched off for at least 25 s.
Service functions

Disable/enable key

It is possible to disable or enable individual keys electronically via the diagnosis function (service functions).
Important
Electronically disabled means that both the starter as well as the engine control unit are not released (enabled) for the start procedure. It should be borne in mind that an electronically disabled key still fits mechanically, i.e. all flaps, lids and doors can still be opened.
Display of keys used to date in this vehicle

Here, the display shows for each one of the 10 keys which can be managed by the EWS3 control unit whether it has been recognised at least once by the EWS control unit, i.e. it is possible to trace, also on older vehicles, how many keys have already been used in this particular vehicle.

Damn term. My head hurts.

well, it seems that since the engine starts, the EWS is working... but the power terminals 30 and R both must be functional for the thing to operate... with only one of them working, the locking may be affected... Is it how you guys are reading that?


Also:

Afterrunning time

Important
For safety reasons, the EWS3 control unit features a code-dependent afterrunning time (approx. 10 seconds). It begins when the ignition lock is switched to 0 position. Within this afterrunning time start with any mechanically fitting key is enabled.

Does it mean, that any correctly mechanically coded key can start the engine in those 10 seconds, even if the key is not electronically coded?

Slick, believe me, my head hurts just by searching for this info... lol...