[6R] [ABS] VCDS coding Bosch ESP9.0i PQ25 (English)

iichel

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Ik doe deze even in 't Engels, omdat dat wat meer mensen aantrekt.

So the coding of an ABS unit is not particularly straight-forward and there are a few things to keep in mind when performing these actions:
- Any recent VAG ABS unit is coded individually, based on VIN, chassis type, engine type and equipment
- Therefore almost every ABS unit has its own individual long coding
- The lack of labels by Ross-Tech is intentional, since the ABS unit is a critical part of any cars safety system and should not be messed around with unless you're absolutely sure what you're doing. This document is intended as informative support, and iichel, MyPolo or Ross-Tech are not in any way responsible for loss of function when changing your ABS coding.

When an ABS unit needs to be coded (i.e. after replacement, retrofit or accidental loss of the long coding), you roughly have three options:
- SVM from VW. The Software Version Management will enable the ODIS software to retrieve your original factory coding from the server in Germany and restore it to your ABS module. This will only work if your (replacement) ABS unit is from the same type and part number as the one it came with from the factory.
- Build it from scratch using this guide.
- Build it with the help from other scans and this guide.

Before we start with the guide, let's get into the basics of long coding.
A long code is a sequence of characters ranging from 0-9 and A-F, with an even length of characters. This is called a hexadecimal code. For example, my ABS coding:

Code:
Address 03: ABS Brakes (J104) Labels: 6R0-907-37x-ESP90.clb
Part No SW: 6R0 907 379 AS HW: 6R0 907 379 AS
Component: ESP9.0i front H02 0002 
Serial number: --------------
Coding: 21DD2485412600C48415246F825300420905
Shop #: WSC 01383 785 00200
ASAM Dataset: EV_Brake1ESP90iBOSCH 003020
ROD: EV_Brake1ESP90iBOSCH_AU21.rod
VCID: 8F2DD5B756A837669D9-80DA

The long coding is 21DD2485412600C48415246F825300420905 and it's made up from 36 characters. This means it has 18 bytes, since bytes come in pairs of two.

Byte 0 is 21, byte 1 is DD, byte 2 is 24 etc until byte 17 which is 00. You'll notice we start counting at byte 0 and not at byte 1. Any byte is basically a number from 00 to FF in hexadecimal so it represents a value from 0 to 255. What's even cooler is that any hexadecimal can be converted to binary bytes. All you need is microsoft excel or you can use any online tool. In excel, simply type your hexadecimal value in cell A1 and in B1 we type: "=HEX2BIN(A1,8)" and we're there. The other way around is just as easy, just type any sequence of 8 charactes, ones and zeros in B2 and give A2 the code "=BIN2HEX(B2,2)" and you're there.

The way I usually play with my BCM is like this:

Screen Shot 2017-10-06 at 17.17.35.png

Coding ESP8.2i

When coding your ESP module, it's good to first determine the length of the long coding. Usually the ESP8.2i modules sport an eighteen-byte long code, but it's good to check. Just open the module with VCDS and see how long the current code is.
Now you can either build the code from scratch, or find yourself a very similar vehicle via i.e. Google.

Finding a long code via Google is not that difficult, for my module I'll type into google:

Code:
"Part No SW: 6R0 907 379 AS HW: 6R0 907 379 AS" VCDS Polo
Note the quotes.

Now just go through the results and see if there is any car that matches your engine. Click.
Let's say we have a Polo GTI LHD and we find another one, with the coding:
210228E3416E00BA842614E682D500401300

We can use this information, together with my description, to determine the correct coding for our own Polo GTI.

Byte 0:
HEX - Chassis type
11 - Ibiza Hatch
13 - Ibiza ST
21 - Polo hatchback LHD
23 - Polo hatchback RHD
41 - Fabia Hatch
43 - Fabia RHD
51 - Polo Sedan
As you can see, there might be some options for Fabia station, Audi A1, etc. Therefore it's always good to google scans of similar cars to your own.

Byte 1:
HEX - Chassis type
DC - Fabia
DD - Polo

Byte 2:
HEX - Brake diameter
24 - Front 256mm disc - rear 200mm drums
28 - Front 256mm disc - rear 230mm disc
44 - Front 288mm disc - rear 200mm drums
48 - Front 288mm disc - rear 230mm disc
68 - Front 312mm disc - rear 230mm disc
78 - Front 312mm disc - rear 256/254mm disc

Byte 3:
HEX - Chassis type
64 - Polo sedan
7D - Fabia and Ibiza
85 - Polo hatchback

Byte 4:
HEX - Transmission
21 - Manual
41 - DSG
43 - DSG in GTI
46 - Manual 2.0 TDI

Byte 5:
HEX 23 + VIN digit #13

Byte 6:
HEX - Chassis
00 - Polo hatch and Ibiza hatch
02 - Polo hatch
07 - Polo Sedan
08 - Fabia

Byte 7:
HEX C0 + VIN digit #14

Byte 8:
The inverse of Byte 0.
You'll convert the HEX value to binary, i.e. HEX 21 = BIN 00100001. Then you invert the binary value, so 00100001 becomes 10000100. Finally you convert 10000100 to HEX, making 84.

Byte 9:
HEX 14 + VIN digit # 15

Byte 10:
Inverse of byte 2 (see byte 8 for description)

Byte 11:
HEX 69 + VIN digit # 16

Byte 12:
Inverse of byte 4 (see byte 8 for description)

Byte 13:
HEX 51 + VIN digit # 17

Byte 14:
Inverse of byte 6 (see byte 8 for description)

Byte 15:
HEX - Engine type
40 - BXW, CGGB, CBZB, CGPA, CBZA, CFHA, CTHE + LHD
41 - CAVE + LHD
42 - CAYA, CAYB, CAYC, CFHD + LHD
4E - CFHD + LHD
52 - CFWA + LHD

Byte 16:
bit 0 = HHC active
HEX 08/09 = Default ESP Off = ASR Off
HEX 14/15 = ESP Off = ESP fully off

Byte 17:
bit 0 = TPMS active
bit 2 = XDS diff active

Keep in mind, you should always use your head when making a code, and it never hurts to cross-check with the google method. The list is probably not complete, i.e. some RHD vehicles are missing from the list.
Soon to come:
ABS8.2
ESP8.2i
ESP9.0i MQB
ESC 7E0
 
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