Aisin MHI2/MHI2Q units with AW7 hardware
:::info Aisin MHI2 and MHI2Q units are manufactured by AISIN AW CO., LTD. for Audi, Porsche, and VW in the Asian market. These units are based on the same MHI2/MHI2Q hardware, but have some software differences.
They feature CN/JP/KR/TW train versions.
In these units, the FAZIT in the EEPROM does not start with "JTB" (as in EU units), "JTH" (as in US units), or other typical Harman identifiers, but instead starts with the characters "AW7", which can also be found on the label:
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MMX Board information
MMX PCB on AW7 is identified like:
BOM: 699
Project: 61852
SKU: 0001
Version: 900
Conversion to EU
- Following m.i.b. backups were studied:
- MU0618-MHI2_CN_AUG22_P0618-AW7-MON28.04.1600012345
- MU0816-MHI2_TW_AU37x_P0901-AW7-MON10.11.1700012345
- MU1005-MHI2_CN_AU57x_K1006-AW7-MON05.07.1700012345
- MU0035-MHI2_KR_AU57x_S0035-AW7-MON13.08.1500012345
- MU0817-MHI2_KR_POG24_P0817-AW7-MON08.09.1700012345
- MU1214-MHI2_CN_AU276_P1214-AW7-MON13.03.1800012345
- MU0623-MHI2_CN_AU57x_P0623-AW7-MON01.07.1600012345
- MU0836-MHI2_TW_VW48x_P0952-AW7-MON23.02.1800012345
- MU0627-MHI2_CN_VW48x_P0627-AW7-MON29.05.1700012345
- MU0627-MHI2_CN_VW48x_P0627-AW7-MON19.01.1600012345
- MU1101-MHI2_JP_VW48x_P1101-AW7-MON20.06.1900012345
- MU0843-MHI2_JP_VW48x_P0953-AW7-MON18.11.1700012345
- MU0734-MHI2_JP_VW48x_K0735-AW7-MON30.01.1700012345
- MU0637-MHI2_JP_VW48x_P0651-AW7-MON18.01.1700012345
- MU1201-MHI2_JP_VW48x_P1201-AW7-MON22.07.1900012345
:::success The first Aisin unit coverted to EU had train MHI2_TW_VW48x_P0952 MU0836 and was converted to MHI2_ER_VWG13_P4521 MU1367
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:::info Conversion was successful but take into consideration that MMX NAND on AW7 is partitioned differently compared to Harman G11/G13 units.
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NAND partitions
Partition mapping of the Harman units differs from Aisin G11 and G13 units:
_____OS_____ Start End ______Number______ Size Boot
name type Cylinder Cylinder Cylinders Blocks
1. QNX6 177 0 685 686 2809792 1371 MB
2. Extd'd 5 686 28005 27320 111902720 54640 MB
2.1 QNX6 178 686 997 312 1277888 623 MB
2.2 QNX6 178 998 2277 1280 5242816 2559 MB
2.3 QNX6 178 2278 4325 2048 8388544 4095 MB
2.4 QNX6 178 4326 4453 128 524224 255 MB
2.5 QNX6 178 4454 4965 512 2097088 1023 MB
2.6 QNX6 178 4966 5477 512 2097088 1023 MB
2.7 QNX6 178 5478 6501 1024 4194240 2047 MB
2.8 QNX6 178 6502 6757 256 1048512 511 MB
2.9 QNX6 178 6758 22731 15974 65429440 31947 MB
2.10 QNX6 178 22732 27851 5120 20971456 10239 MB
2.11 QNX6 178 27852 28005 154 630720 307 MB
3. QNX6 179 28006 30315 2310 9461760 4620 MB
4. ------ --- -------- -------- ------- -------- -----
Partition 2.8 is smaller and partition 2.11 is added:
/dev/mnand0t178.10 630528 10752 619776 2% /mnt/aw-persiste
Examples
MU0623-Partition.txt
MU0836-Partition.txt
MEN2
Changes in the MMX NAND file system
/mnt/navdb/db/SPOT/ 1557896 1557896 0 100% /mnt/navdb/spot/
/mnt/navdb/db/DBICO 9324 9324 0 100% /mnt/navdb/dbico
/dev/mnand0t178.10 630528 10752 619776 2% /mnt/aw-persiste
/ramdisk/pps_dummy_ 0 0 0 100% /ramdisk/pps
:::tip There might be more, but time and access to this unit was limited.
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Conclusions
For a cleaner conversion to EU it would be better to repartition the NAND too.
A conversion from EU to CN/JP/KR/TW will most likely only work if the NAND is partitioned like shown above to have FW running correctly.
This special partitioning seems to be just FW related and bound to Asian market and not a hardware limitation.