A4 Sedan V6-2.8L (AFC) (1996)
Heated Glass Element Switch: Testing and Inspection
Rear Window Defroster Signal, Checking
Requirement
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Engine Control Module (ECM) coding OK refer to "Code control module under On Board Diagnostic (OBD)-Multiport Fuel Injection (MFI)",
under /Powertrain Management/Fuel Delivery and Air Induction/Testing & Inspection".
Checking
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Using VAG 1551 scan tool, select "Read Measuring Value Block" function 08, display group 004, display field 4, refer to "Read Measuring Value
Block (Function 08) under On Board Diagnostic (OBD)-Multiport Fuel Injection (MFI) under "/Powertrain Management/Fuel Delivery and Air
Induction/Testing & Inspection".
Indicated on display, note value in display field 4
Read measuring value block 4
->
1
2
3
4
Specified value: 0XX_XX
CAUTION!
Do not use the shift inputs (identified by an X) during the RPM increase check.
-
Switch ON rear window defroster.
Specified value: 1XX_XX
If display value is OK:
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Press -> button.
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Select "End Output" function 06.
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Press -Q- button to confirm input.
If display value does not change:
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Switch ignition OFF and connect VAG 1598/19 test box to ECM harness connector.
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Connect VAG 1527B voltage tester between VAG 1598/19 test box socket C14 and Ground (GND).
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Switch ignition ON.
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Switch ON rear window defroster.
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Voltage tester must light up
If voltage tester does not light up:
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Check wiring for continuity between C14 and rear window defroster using wiring diagram.
If wiring is OK:
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Check rear window defroster using wiring diagram.