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A2

Checking the voltage supply to the fresh-air blowerV2
Checking the voltage supply to the fresh-air blower -V2-
–  Switch off the ignition.
–  Disconnect the adapter -V.A.G 1598/11- and adapter -V.A.G 1598/12- from the test box.
–  Connect the operating and display unit for air conditioner/Climatronic -E87- to the vehicle wiring harness.
–  Remove the glove compartment. → General Body Assembly, Interior; Repair group 68
   
–  Unplug connector -A- from the fresh-air blower control unit -J126-.
–  Measure the voltage between contact -2- (or contact -5-) and contact -4- on connector -A-
Specification: Battery voltage
  Note
t  If there is no connection to contact -2-, check whether there is a connection to contact -5-. The fresh-air blower control unit -J126- can be powered via both inputs.
t  If the voltage is below the battery voltage, repair the voltage supply or earth connection in accordance with the current flow diagram.
  A87-0338
–  Attach connector -A- to the fresh-air blower control unit -J126-.
  A87-0338
–  Unplug connector -A- from the fresh-air blower -V2-.
–  Connect the multimeter leads -VAS 5051/7- to connector -A-
–  Set the vehicle diagnostic, testing and information system -VAS 5051- to “measuring instrument: voltage measurement” mode.
–  Switch on the ignition.
–  Set the operating and display unit for air conditioner/Climatronic -E87- to “Auto” mode.
–  Change the fresh-air blower speed by pressing the “+” and “-” speed control buttons on the operating and display unit for air conditioner/Climatronic -E87-.
When the operating and display unit for air conditioner/Climatronic -E87- setting is adjusted, the voltage displayed on the vehicle diagnostic, testing and information system -VAS 5051- changes
  Note
The target fresh-air blower speed appears as a bar chart on the display of the operating and display unit for air conditioner/Climatronic -E87-.
–  In order to ensure that the fresh-air blower -V2- starts up reliably, the first bar corresponds to approx. 3.5 to 4.5 V.
–  The voltage is increased by approx. 0.7 V with each additional bar.
  A87-0339

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