A8 Quattro Sedan V8-4.2L (AKB) (2002)
Rear Defogger: Testing and Inspection
Rear window defroster, electrical test
Required measuring and test items
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Multimeter VAG1715 (with current probe)
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Test set VW1594 A
Test requirements
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All fuses OK per wiring diagram
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Switch off ignition.
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Remove A/C control head -E87-.
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Remove connector -F- from control head -E87-.
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Switch on ignition.
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Measure voltage between contacts 1 and 2.
Specified value: approx. battery voltage
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Switch off ignition.
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Connect connector -F- to -E87-.
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Guide wire -A- to connector -E- using VAG1715.
NOTE: All connectors connected to -E87-.
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Function "Current measurement via current tool" on VAG1715.
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Start engine.
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Switch on rear heated glass to -E87- (warning light in the button lights up).