Checking supplementary air heater — AUDI

Checking supplementary air heater
There are different versions of the electric supplementary air heater (with and without
supplementary air heater control unit
J604
)
Current flow diagrams, Electrical fault finding and Fitting locations
On vehicles with diesel engine manufactured up to November 2006 (gradual conversion), the
supplementary air heater element
Z35
is actuated by way of the
supplementary air heater control unit
J604
. Guided fault-finding for the supplementary air heater is only possible on these vehicles
"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051
.
Vehicles manufactured from November 2006 onwards (gradual introduction), are fitted with a 3-stage
supplementary air heater element
Z35
which is actuated by the corresponding engine control unit via a relay
"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051
and
Current flow diagrams, Electrical fault finding and Fitting locations
.
Note
The
Z35
is only intended for vehicles with diesel engine and from model year 2012 (gradual introduction), also for certain versions of the vehicle with 1.2l petrol engine. On the other vehicles with petrol engine, no additional heater is currently installed and the auxiliary heater is not actuated as an additional heater
Vehicle diagnostic, testing and information system VAS ‎‎‏‏5051 in ”Guided fault-finding”.
and
Auxiliary heater
Rep. gr.
82
There are different versions of the
supplementary air heater control unit
J604
. Pay attention to precise assignment on replacement.
Electronic parts catalogue
Supplementary air heater guided fault-finding is to be performed by way of the
“Guided fault-finding”
function using the
Vehicle diagnostic, testing and information system
VAS 5051 A
"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
The
supplementary air heater control unit
J604
is integrated into the
supplementary air heater element
Z35
(separate replacement not possible). The
supplementary air heater element
Z35
is installed in the heating system/air conditioner air distribution housing
Chapter
and
Chapter
.
Depending on the version of the operating and display unit,
Climatronic control unit
J255
, it may not always be possible to erase certain faults immediately. On these vehicles, interrupt the power supply to the operating and display unit,
Climatronic control unit
J255
with the ignition switched off (terminal
“30”
in connector
“D”
) for approx. 30 sec.
Depending on the version of the operating and display unit,
Climatronic control unit
J255
, certain settings and codes may not be adopted immediately. If necessary, lock the vehicle and leave it to stand for at least 30 minutes to allow the data bus to switch to
“sleep mode”
and so as to permit adoption of these new settings on next wake-up of the system.