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Operation of air recirculation mode button and actuation of fresh air and air recirculation flap control motorV154 > < Functions of heater controls (heater control unitJ65)

A3 Mk2

Actuation of heated rear windowZ1
   
Actuation of heated rear window -Z1-
t  Pressing the button -E- with the ignition on causes the onboard supply control unit -J519- to be actuated by an earth signal (the signal is applied as long as the button is pressed). As soon as -J519- activates the heated rear window (only with engine running), the lamp in the button -E- lights (-J519- emits a positive signal). The heated rear window is switched off by pressing the button -E- again and switching off the ignition → Current flow diagrams, Electrical fault finding and Fitting locations and → Owner's manual.
t  If the voltage measured at the onboard supply control unit -J519- at terminal „30“ drops below a value stored in -J519-, the heated rear window -Z1- is completely deactivated or the power is reduced to relieve the load on the alternator -C- → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 (for -J519-).
  A80-0239
t  The heated rear window -Z1- is only actuated by the onboard supply control unit -J519- with the engine running. When the engine is stopped, there is no actuation and no feedback from -J519-, the LED in the button -E- does not light or goes out again shortly after actuation → Owner's manual and → Current flow diagrams, Electrical fault finding and Fitting locations.
t  If the heated rear window -Z1- has to be briefly deactivated by the onboard supply control unit -J519- on account of undervoltage, the indicator lamp in the switch for the heated rear window -E- remains on. However in the event of lengthy deactivation, -J519- switches off the indicator lamp.
t  Checking the actuation function of the heated rear window -Z1- is described in the guided fault-finding for the onboard supply control unit -J519- and for the air conditioner → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 (for -J519-).
  Note
t  The heated rear window -Z1- is switched off automatically at ambient temperatures above 0 °C on completion of the operating time stored in the onboard supply control unit -J519- (approx. 10 minutes) by the onboard supply control unit -J519-.
t  On vehicles manufactured as of the start of production, the heated rear window is switched off by the onboard supply control unit -J519- after approx. 20 minutes at ambient temperatures below 0 °C. As of a later date (introduction not yet finalised), vehicles are to be fitted with an onboard supply control unit -J519- which will maintain actuation of the heated rear window until the ignition is switched off (manual deactivation and reactivation are possible at any time). If the temperature rises above 0 °C during a driving cycle, the heated rear window is switched off on completion of the operating time (approx. 10 minutes) stored in -J519-.
t  As of Model Year 2010 a start/stop system will be available as an optional extra for this vehicle in conjunction with certain engines. On vehicles with a start/stop system, the heated rear window is deactivated whilst the stop function is active (to protect the battery -A-). The setting for actuation of the heated rear window -Z1- does however remain stored. Once the engine has been re-started via the start function, the heated rear window is actuated again → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
  A80-0239

Operation of air recirculation mode button and actuation of fresh air and air recirculation flap control motorV154 > < Functions of heater controls (heater control unitJ65)