Sometimes, when you replace a second- hand instrument cluster for Mercedes Benz Vito/Viano, W636/W639, it may not show mileage. The data of this Mercedes instrument is relatively special. It involves a variety of verification, including inverse code and transposition. Don’t worry! Just follow this post to fix the problem with CG100, CG Pro 9S12 and CGDI MB easily.
1.Read original chip data with CG100/ CG100X /CG Pro
Disassemble the instrument cluster
Remove dashboard
Locate the chip IC 25LC640
Read 25640 chip data with CG100 Prog III or CG Pro 9S12 programmer
Save EEPROM
2.Read original key info with CGDI MB to modify data
The red frame is the mileage area, which can be changed to 0.
The blue frame is the synchronization ID (SSID) of the instrument cluster and the key, which needs to be modified according to the SSID of the current key.
For mileage to show, mileage+ SSID must match EZS.
Use CGDI Prog MB key programmer to read the original key information
And then record the SSID and key position
Such as the current key position: 2
SSID: 69 6F 44 40
From the key info, we can infer that the first key SSID should be 68 6F 44 40.
The main point:
1.SSID variants
68 6F 44 40 transferred 97 90 BB BF
97 90 BB BF back to front: BF BB 90 97
2.SSID verification
BF=40, BF verification: B0 4F
BB=44, BB verification: B4 4B
90=6F, 90 verification: 9F 60
97=68, 97 verification: 98 67
3.Input the following value in blue frame
BF B0 4F BB B4 4B 90 9F 60 97 98 67
Comparison diagram: Before and After data modification
Write the modified chip data to cluster
Reinstall instrument cluster to the vehicle
The correct mileage shows on the dashboard, all data are working.
Perfect! Mercedes Benz Vito/Viano, W636/W639 not show mileage problem has been successfully solved by CGDI devices.
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