Auto Hold Retrofit

No need to run wires all the way to the ABS unit from the center console. All 4GX comes with this wiring factory installed. Nevertheless, note that this was done to 1AT PR code ABS module. If you have 1AS ABS module, it may still work, but it may stress your ABS unit slightly more.

Example ABS Control Unit is Part No Numbers:
SW: 4G0 907 379 G
HW: 4G0 907 379 G
Component: ESP PREMIUM H09 0250

Part Required:
4G927225B (OEM)

Procedure

1. Use Liftan gearinterior shifttool bootto cover.remove the leather interior trim.
2.  Lift MMI console by using two interior tools at the top half and pulling backwards towards you while you lift up.
3. UnplugThere parkingare breakthree buttontabs connectoron the original switch that need to be released to push it from the bottom towards the top of the panel.
4. ReplaceInsert existing with 4g1927225b4G927225B
5. AssembleReconnect backconnectors
6. Reassemble
7. Use VCDS
   
8. Select Address 03 (ABS)
9. Access authorization -> Enter Access Code 61378 (Accessor Code S11820 for C7.5)
10. Long Coding Helper -> Byte 8,8
Activate
11. Use bitthe 4,call 7out below to change this byte to the proper value.
12. Turn your car off and deactivateback biton
6.
13. Clear DTCs via VCDS or OBD11

DO NOT JUST PASTE THE BELOW ABS CODING TO YOUR ABS CODING.

Now,

if you use VCDS, you wouldn't be able to tick a box in long coding helper.

So, you need to calculate

Calculating Byte 8's HEXValue:
For value!

Forour example, the original ABS long coding we'll use is:

44A70F0122E5F080
44A70F0122E5F0804B00
4B00

and 4B near the end is Byte 8.

8

HEX(as 4Bthey isstart Binaryat 01001011

00)
(See

Changingbelow bits to 10011011

Converting binary 10011011 to HEX is 9B

So the new long coding is:

44A70F0122E5F0809B00

table)

https://www.binaryhexconverter.com/hex-to-binary-converter

00	01	02	03	04	05	06	07	08	09
44	A7	0F	01	22	E5	F0	80	4B	00

The 8th byte in this case, 4B is binary for 01001011
By changing the first four digits to 10011011
The converted binary 10011011 to HEX is 9B
So, our new long coding would be:
44A70F0122E5F0809B00
(See below table)

https://www.binaryhexconverter.com/hex-to-binary-converter

00	01	02	03	04	05	06	07	08	09
44	A7	0F	01	22	E5	F0	80	9B	00

DO NOT JUST PASTE THE ABOVE ABS CODING TO YOUR ABS CODING.

Enter the coding and you will get immediately a TPMS error.

Just restart the ignition, clear codes and it should go away.