It works this way in immo3 Me7:

The ECU starts the engine, then asks the cluster via k-line and/or can: Am I allowed to start?

There are 3 possible answers:

1- Yes (the car stay running)
2 - No (the car stalls)
3 - No answer (the car stalls)

To make his answer, the cluster will check if it shares the same immo data as the ecu, then read the transponder and compare it with his list of 8 allowed key spots in cluster eeprom.

When a key is matched, it gets locked to the cluster/immo data is was maried. That transponder is now unusable on any other immo data than original cluster/ecu.

So if you keep immo data from either original ecu or cluster, yes you can match everything.

If you plan to match ecu/cluster with anything else than your original immo data, you need new transponders.

Read your eeprom (easier said than done, may very well need a test clip). Assuming they just turned off your immobilizer, not flashed a generic immo-off. Then change the values at 12 and 22 from 02 to 01, and correct the sums (increase the value at 1E and 2E by 1), and reflash the now immo-on eeprom image.

I think you calculated the checksums wrong..

4A = 4B
49 = 80

Ignore him. All the sums in those files are good.

ME7 EEPROM Checksum-Guide
=========================

The ME7 EEPROM contains 512 bytes and is divided into 32 pages with 16 bytes per page.
In the ME7 code you will find a table with 32 entries that contains one descriptor word for
each eeprom page. The index into this table is the eeprom pagenumber (00..31).

The descriptor word is a bitmask, the following bits are relevant for the checksum calculation:
 bit 0 = checksumPresent(CS)   1 -> page has checksum,  0 -> page has no checksum.
 bit 6 = cksumBit(CB)          this bit is subtracted from the pageNumber to get the
                               same checksum in backup page as in original page.
 bit 7 = backupPage(BP)        1 -> page has a backup page.

Here is how the eeprom page info table looks like:
PAGE   DESCR-WORD  -> CHECKSUM-BITS
-----------------------------------
00      FF18       ->    --
01      0017       ->   (CS)
02      0117       ->   (CS)
03      0207       ->   (CS)
04      0307       ->   (CS)
05      0437       ->   (CS)
06      0533       ->   (CS)
07      06B7       ->   (CS) (BP)
08      06F7       ->   (CS) (BP) (CB)
09      07B3       ->   (CS) (BP)
10      07F3       ->   (CS) (BP) (CB)
11      08B7       ->   (CS) (BP)
12      08F7       ->   (CS) (BP) (CB)
13      09B3       ->   (CS) (BP)
14      09F3       ->   (CS) (BP) (CB)
15      0AB3       ->   (CS) (BP)
16      0AF3       ->   (CS) (BP) (CB)
17      0B32       ->    --
18      0B10       ->    --                           
19      0B10       ->    --                           
20      0B10       ->    --                           
21      0C37       ->   (CS)
22      0D33       ->   (CS)
23      0E33       ->   (CS)
24      0F33       ->   (CS)
25      1033       ->   (CS)
26      1133       ->   (CS)
27      1233       ->   (CS)
28      1235       ->   (CS)
29      1235       ->   (CS)
30      13B7       ->   (CS) (BP)
31      13F7       ->   (CS) (BP) (CB)

If the checksumBit(CS) is set for a page, this page has a checksum.
Calculate the checksum as follows:
- sum up the first 14 bytes of the eeprom page in a 16bit variable.
- add the page number to the sum.
- if the checksumBit(CB) is set, subtract 1 from the sum.
- negate the sum (this is not the same as complement!).
- store the resulting value in the last two bytes of the eeprom page,
  first the low-byte, then the high-byte.

Disclaimer: this information was collected to the best of one's knowledge, but I won't give
any guarantees for the correctness of my information. If you find any errors, please correct.
Have fun, mki

Look at your examples.

12 and 22 on the ON file are 01.
12 and 22 on the OFF file are 02.

That's the immobilizer. ON is 01. OFF is 02. Then, just correct the checksums. If you ADD to the page, SUBTRACT the number you added from the checksum of that page.

The checksums for those pages are at 2E and 3E.

So, say this is your setup:

        0   1   2   3   4   5   6   7   8    9   A   B   C   D   E   F
10 : XX XX 01 XX XX XX XX XX XX XX XX XX XX XX FE XX
20 : XX XX 01 XX XX XX XX XX XX XX XX XX XX XX FD XX

Is IMMO ON

You would change it to:

       0   1    2   3   4   5   6   7   8    9   A   B   C   D   E   F
10 : XX XX 02 XX XX XX XX XX XX XX XX XX XX XX FD XX
20 : XX XX 02 XX XX XX XX XX XX XX XX XX XX XX FC XX

which is IMMO OFF.