What tool to read and write Audi A4 eeprom HC12

Purpose:

copy the immo information from a cluster to another
make the mileage follow with the immo information

If clone all eeprom content than the mileage is transferred too.

 

 

Model:

Audi a4 2001

 

Optional devices:

Digiprog3, or ecu programmers like Xprog, Carprog, UPA USB programmer

 

Original cluster:

The Jaeger cluster barely works

audi-a4-2001-cluster

 

audi-a4-2001-cluster-1

audi-a4-2001-cluster-2

Suggestion:

read the pin code from both the Instrument and adapt it to the vehicle

 

What to do on pin 21 and 22 on the chip:

 pin-21-pin-22-on-audi-a4-chip

– With car ECU programmers:

Eprom.set type,mcu,hc12,read,save.
eprom,set type,mcu,hc12,file,load,write.
Buy yourself Xprog-M programmer, Carprog full, UPA USB.
Pin 21 and 22 jumper after programming or wait 10 minutes.

 

– with Digiprog 3:

 digiprog3-read-audi-mileage

Eprom,set type,mcu,hc12,read,save.
eprom,set type,mcu,hc12,file,load,write.

 

Reference:

Eeprom HC12 read and write to the other counter:

 

AUDI MM AB 8/2001 DIAGNOSIS / TACHO DIAGNOSIS

(Write down the exact ALWAYS old / incorrect Mileage)

The diagnostic port is in the driver’s footwell. Turn the ignition

on a vehicle. Connect plug ST16 the diagnostic port and the

DIGIPROG.

 

Select the program: cars / trucks – AUDI – MM 4 / 99- DIAG.

The DIGI PROG II shows you the old / incorrect Mileage.

Enter the new / correct Mileage and confirm this.

Should be then after programming on the speedometer 999999 KM give

The old / wrong KM value again so that the speedometer again the old /

false indicates KM. Now you build the speedometer and break it to the

see board. Solder the green and black wire to the same color marked

Arrows at. Now connect the blue and the green plug with

the speedometer and plug ST41 with the DIGI PROG (picture on the following page.)

Now select the program: cars / trucks – AUDI – MM 4/99 HC12.

The DIGI PROG shows you the old / incorrect Mileage. Enter the

new / correct Mileage and confirm this with the hook.

Now shows you the DigiProg II 5 min wait. Remove the connection

between the DigiProg and the speedometer, wait 5 minutes and build the speedometer

again. Alternatively, for 5 min. Wait, you can also like in the image on the

next page shows the pins 21 and 22 bridges.

audi-a4-hc12-eeprom-1

Here necessarily the board from any power supply (Digiprog3 v4.94,

external power supply, etc.), Pin 21 + 22 bridge, and then you can use the tachometer

Immediately reinstall.

audi-a4-hc12-eeprom-2

OBD365 disclaimer:

TRY AT YOUR OWN RISK

Thanks for all tech support from members’ share at cartechnology forum.

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About eobd21

I am a car lover and like to repair car by myself, and know more info about car diagnostic tool and other obd2 tools, share these info with everyone.
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