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25/09/2015

Encypt CAS lost ISN value, solved with VVDI Prog

Problem: 

Have an BMW X5 here with all keys lost CAS3+, read the CAS with rosfar as usuall

Tries to make a key from file and get these errors ”Detect encrypt CAS version. But CAS lost ISN value. Continue prepare key may cant start engine. ” and the second picture error “Can not find useful combine data, please check the EEPROM file.”

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Working Solution:

This bmw eeprom don’t have enough data for combine test

For this car, you need read ISN from engine with other tool, the best working tool which can read BMW ISN from engine is VVDI prog made by Xhorse Company. 

 

The Procedure to Read BMW Engine ECU ISN with VVDI PROG

YouTube video: https://youtu.be/pJE9AhACibU

BMW-Engine-ECU-3.jpg

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Open VVDI PROG software.

Select type: 3-ECU  Brand: BMW_F_ENGINE  Device: MEVD172(N20) 

Click “Wiring Diagram”

 

Wiring Diagram is open, it prompts NO.2 connector. 

NO.2-connector-5.jpg

NO.2 connector picture as follows.

NO.2-connector-6.jpg

Pull down the wiring diagram, attention: the left corner is NO.33 pin, and the right corner has pin, follow its pin number and order to connect the cable.

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This is real BMW Engine ECU 

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All of pin numbers are marked as follows.

pin-serial-number-9.jpg

Next, to plug the cable into VVDI PRO 

connect-the-cable-10.jpg

Firstly, connect red power cables, there are 2 power cables, one is No.1 pin, one is NO.22 pin.

power-cable-11.jpg

2-power-cables-12.jpg

Next, connect GND cable, it is NO.10 pin.

GND-cable-13.jpg

Finally, connect blue CANH cable and yellow CANL cable.

 

This group of cables are connected well.

connected-well-14.jpg

This is Bootm line.

boot-line-15.jpg

Open a hole on Engine ECU and locate the pin position by following the wiring diagram, then use Boot line to point at this pin and to read data. 

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Note: an external power adapter is necessary for VVDIprog, because it reads Engine ECU.

 

Close wiring diagram on VVDI Prog 

 

Select “New Create”

 

Select “Read”

 

Wait until the data is read out successfully. 

 

Select “Save” to save data.

 

Last note: 

If BMW CAS4+ all key lost, firstly read CAS data then Engine ECU data, when it asks for ISN code, just load Engine ECU EP data to generate dealer key.

 

Done. 

Hope this helps.

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