A4 V6-3.0L (AVK) (2004)
Heated Glass Element: Testing and Inspection
Electrical Testing Of Components Activated By A/C Control Head -E87-
Heated rear window -Z1-, testing
NOTE:
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If a condition exists which disables the heated rear window to be switched on (short circuit in wiring to rear window, open circuit in voltage supply
to A/C control head -E87- or the an open top on convertible) the indicator light in the button of the A/C control head -E87- illuminates when
pressing the button, and goes out after button has been released, the heated rear window however is not switched on.
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If voltage on terminal "30" measured by the A/C control head -E87- drops below 12.5 volt, the performance of the heated rear window is reduced
and the generator load is reduced (the electronic of the A/C control head -E87- reduces the activation from 100% to 90%-10%).
Special tools and equipment
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VAS 5051 Vehicle Diagnostic, Testing and Information System (with current clamp)
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V.A.G 1594 A connector test kit
Test requirement:
All fuses OK:
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Switch ignition off.
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Remove A/C Control Head -E87-.
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Disconnect connectors -D- and -F- from A/C control head -E87- Connect adapter cable V.A.G 1598/12 of test box to disconnected harness
connector -D-.
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Connect V.A.G 1598 A test box to V.A.G 1598/12 adapter cable
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Measure voltage between terminal 5 of connector -F-and socket 13 (Ground connection) of test box.
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Specification: approx. battery voltage
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Measure resistance between terminal 6 of connector -F-and socket 13 (Ground connection) of test box.
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Specification: Resistance approx. 0.5 to 1.0 ohm.
NOTE:
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Resistances value smaller than 10. cannot be measured accurately with shop tools, a short circuit in the wiring connection or in the Heated Rear
Window -Z1- cannot be detected
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If the resistance value is too large, check and eliminate open circuit in wiring connection to Heated Rear Window -Z1-.