Auxiliary Heater Heating Element -Z35-, Checking: Notes

WARNING: This page is about a different variant/trim than selected.

NOTE:

Currently, Vehicles With A Diesel Engine And Certain Gasoline Engines (For Example, Vehicles That Can Use Bioethanol "Flex Fuel Vehicle" From MY 2010 And On High Voltage Vehicles) Have An Electric Auxiliary Heater. Refer To The Audi Sales Program. The Air Is Supplied With Heat Energy After Leaving The A/C Heater Core If There Is A Request From The Climatronic Control Module -J255- A/C Display And Control Head.

The air is supplied with heat energy via the Auxiliary Heater Heating Element -Z35- after it has left the A/C heater core. An optional parking heater may be activated later as an "auxiliary heater" (introduction open). Refer to AUXILIARY HEATER HEATING ELEMENT -Z35-, REMOVING AND INSTALLING .

Vehicles without an Auxiliary Heater Heating Element -Z35- have a honeycomb installed inside the A/C unit instead of the Auxiliary Heater Heating Element -Z35-. Refer to AUXILIARY HEATER HEATING ELEMENT -Z35-, REMOVING AND INSTALLING .

For vehicles with a diesel engine, the electrical auxiliary heater (the Auxiliary Heater Heating Element -Z35-) is activated via the respective engine control module (for this, the control modules exchange information via the Data Bus system) using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function. Refer to the appropriate Wiring Diagram.

For vehicles with a gasoline engine, the electric auxiliary heater (the Auxiliary Heater Heating Element -Z35-) is activated by the Climatronic Control Module -J255- display and control head via the local Data Bus (activated via the same outlet and also via the Fresh Air Blower Control Module -J126-) on the Auxiliary Air Heater Control Module -J604-. The Auxiliary Air Heater Control Module -J604- then activates the Low Heat Output Relay -J359- and the High Heat Output Relay -J360- and these send the current to the Auxiliary Heater Heating Element -Z35- using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function. Refer to the appropriate Wiring Diagram.

In the measured values block for the Climatronic Control Module -J255- A/C display and control head, it is shown that the request to the respective engine control module/Auxiliary Air Heater Control Module -J604- to switch on the electrical auxiliary heater is being sent using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function. If the request is changed or why the activation did not occur despite the request will appear in the measured values block for the engine control module on a diesel vehicle using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

The Auxiliary Air Heater Control Module -J604- installed on vehicles with a certain gasoline engine is currently not diagnostic-capable using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

Currently an Auxiliary Heater Heating Element -Z35- is also installed on vehicles with a high voltage system (Hybrid vehicles) and a gasoline engine. Refer to AUXILIARY HEATER HEATING ELEMENT -Z35-, CHECKING .

The test for the activation of the Auxiliary Heater Heating Element -Z35- depends on the engine version. For a vehicle with a diesel engine, this can be found in the Guided Fault Finding for the engine installed in this vehicle. For a vehicle with a gasoline engine, this can be found in Guided Fault Finding for the A/C system using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

In MY 2009, as a running change, a new version of the Auxiliary Heater Heating Element -Z35- is being installed (the heating elements are a bit more narrow); be sure to use the correct version and note the allocation.

From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. For vehicles with a Start/Stop System, the Auxiliary Heater Heating Element -Z35- activation is switched off for the time in which the stop function is active (to protect the Battery -A-). After the engine is started again via the Start function, the Auxiliary Heater Heating Element -Z35- is activated again using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

Check the resistance value of the Auxiliary Heater Heating Element -Z35- using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.