Audi Workshop Service and Repair Manuals

• ‒ Connect the vehicle diagnostic, testing and information system VAS 5051 to the vehicle's 16-pin diagnostic socket using the diagnostic cable VAS 5051/1, with ignition switched off and select the control unit of the additional heater -J162 using "address word" 18.

Preconditions:

• ● The fault memory has been interrogated .
• ● Additional heater is switched off.

→ Display on VAS 5051:

• ‒ Select function "07 - Encode control unit".

→ Display on VAS 5051:

• ◆ The prompt to enter the code is given in display zone -1-.
• ◆ An input keyboard is displayed in display zone -2-.
• ◆ The instantaneously valid and, in parentheses, the previously valid code is given in the fourth line in display zone -3-.
• ◆ The workshop code, which is entered in your VAS 5051, is given in the fifth line of display zone -3-.

• ‒ Encode control unit -J162 of the additional heater according to version and the required undervoltage cut-off.

• Coding table

• ‒ Enter the code from the coding table via zone -2-.
• ‒ Confirm entry by pressing the "Q key" in display zone -2-.

→ Appears on display of VAS 5051 after a short time

• ◆ The message "Encoding in vehicle system carried out" appears in the display zone -1-.
• ◆ The control unit identification with the new code and the old code, in parentheses, is displayed in display zone -2-.

• ‒ After entering the code, the cut-off voltage must be checked and, if necessary, re-entered via the "Adaption" function

Notes:

• ◆ By pressing the ←key you will return to the selection program.

• ◆ The following versions may have been fitted, depending on the vehicle equipment:
• ‒ Additional heater without recirculating pump -V55
• ‒ Additional heater with recirculating pump -V55 (not provided for in the Audi A2 at present).

• ◆ Due to the possibility of adjusting the CO2-content in the exhaust gas, the auxiliary/additional heaters with the control unit as of software version "D49" which are designed for the Audi A6 or A8) may also be installed on the Audi A2 as additional heater.

=> Parts List

• ‒ Auxiliary/additional heater with part number 4D0 265 105 as of index "H"
• ‒ Auxiliary/additional heater with part number 4B0 265 105 as of index "E"
• ‒ Additional heater with part number 4D0 265 071 as of index "B"

• ◆ The control unit identification is dependent on the vehicle equipment; the exact assignment can be found in:

=> Parts List

• ◆ The additional heater control unit -J162 provides for different encoding versions. However, currently only the coding "00002" is permissible for versions with additional heater in the Audi A2.
• ◆ As of model year 2001 additional heaters with a -J162 heater control unit and a software version starting from "D50" are used.

• ◆ If on additional heaters with a -J162 heater control unit and a software version as of "D50", the additional heater does not begin to operate if contact "3" of the 6-pin connector is connected to earth (additional heater actuation) check the adaption in the -J162 control unit adaption channel "10" and correct it as necessary.

• ‒ On control units with software version "D50" or "D51" only the adaption "0" must have been entered.
• ‒ On control units as of software version "D50" the adaption "0" or "2" must have been entered.

Main differences between the two additional heater coding versions

• ◆ With code "00002" or "00012" the cut-off takes place at the voltage value entered in the "Adaption" function
• ◆ Code "00001" or "00011" makes allowances for battery voltage changes at different temperatures. The voltage drop calculated during basic setting is also included in the calculation. This encoding is not envisaged for this version as auxiliary heater. At present, installation of an auxiliary heater in the Audi A2 is not envisaged.

=> Audi A8 auxiliary/additional heater

=> Audi A6 auxiliary heater

Encoding table

Encoding of additional heater:

Notes:

• ◆ For additional heaters with recirculating pump, always enter encoding "00002"
• ◆ The coding "00012" is only to be entered on vehicles where a -V55 recirculating pump has been fitted (not provided for in the Audi A2 at present).