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Checking electric additional heater > < Electrical check for actuation of the heated rear window Z1

A2

Special tools, testers and auxiliary equipment required
Special tools, testers and auxiliary equipment required
t  Vehicle diagnostic, testing and information system -VAS 5051- (with a 50 A current probe -VAS 5051/9-)
t  Adapter set -V.A.G 1594C-
Prerequisite
t  All the fuses are OK → ”Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations”
–  Switch off the ignition.
–  Remove the operating and display unit for air conditioner/Climatronic -E87- → Chapter.
   
–  Unplug connector -E- from the operating and display unit for air conditioner/Climatronic -E87-.
–  Switch on the ignition.
–  Measure the voltage at connector -E- between contacts “1” and “2”.
t  Specification: approx. battery voltage
–  Switch off the ignition.
  A87-0353
–  Plug in the connector -E- on the operating and display unit for air conditioner/Climatronic -E87-.
–  Guide the supply lead -A- to the connector -E- through the 50A current probe -VAS 5051/9-
–  Set the vehicle diagnostic, testing and information system -VAS 5051- to “multimeter measuring: 50A current probe” mode.
  Note
All the operating and display unit for air conditioner/Climatronic -E87- connectors must be plugged in.
–  Start the engine.
–  Switch on heated rear window on the operating and display unit for air conditioner/Climatronic -E87- (the warning lamp in the button lights up).
t  Specification: the display on the vehicle diagnostic, testing and information system -VAS 5051- changes from approx. 0 A to less than 25 A
–  Wait for approx. 12 minutes
t  Specification: the display on the vehicle diagnostic, testing and information system -VAS 5051- changes from less than 25  A to approx. 0 A (the warning lamp in the button goes out)
  Note
t  Stray current may cause a low current reading on the current probe with the heated rear window switched off.
t  If the ambient temperature is below 0 °C, the rear window heating remains activated until the ignition is switched off (can be deactivated manually at any time). If the temperature during a driving cycle rises above 0 °C, the heated rear window is deactivated on completion of operating period stored in the operating and display unit for air conditioner/Climatronic -E87- (currently approx. 12 minutes).
t  At ambient temperatures greater than 0 °C, the heated rear window is switched off automatically by the operating and display unit for air conditioner/Climatronic -E87- on completion of the operating period stored in the operating and display unit for air conditioner/Climatronic -E87- (currently approx. 12 minutes).
  A87-0190

Checking electric additional heater > < Electrical check for actuation of the heated rear window Z1