Automotive Diagnostic Command Set & kwp2000 Read/Write Memory By Address

I used NI Automotive Diagnostic Command Set 1.0 Read/Write EEPEOM By Address of ECU base VW TP2.0 KWP2000 diagnostic protocol . I used NI example ReadWrite Memory.vi but not successful. I know must use below step.
Description
The usual procedure for getting a security access to the ECU is as follows:
Request a seed from the ECU using RequestSeed.vi with access mode = n.
From the seed, compute a key for the ECU on the host.
Send the key to the ECU using SendKey.vi with access mode = n + 1.
The security access is granted if the ECU validates the key sent. Otherwise, an error is returned.
Who has used NI Automotive Diagnostic Command Set 1.0 and know VW TP2.0 KWP2000 protocol. Please support some suggest and example VI.
Thanks

I modify NI example Read/Write Memory lool at attached files.
Now I know how to calculate the key and successful.But sometimes ok and sometimes no ok. The best luck is pass three error.
Attachments:
pho0.JPG ‏99 KB
ReadWrite ECU.vi ‏66 KB
seedaddkey.vi ‏12 KB

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