window AUDI A4 2000 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual

24-88


Auxiliary input signals,
checking

Rear window defroster signal, checking


Requirement

Engine Control Module (ECM) coding OK
page 01
-247
.

Checking

- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 004, display field 4 page 01
-249
.
Read measuring value block 4 1 2 3 4

Indicated on display, note value in display field 4
CAUTION!
Do not use the shift inputs (identified by an X) during the RPM
increase check.
If display value is OK: Specified value: 0XX_XX
- Switch ON rear window defroster.
Specified value: 1XX_XX
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If display value does not change:

- Switch ignition OFF and connect VAG 1598/19
test box to ECM harness connector page 01
-
255
.

- Connect VAG 1527B voltage tester between
VAG 1598/19 test box socket C14 and Ground
(GND).

- Switch ignition ON.

- Switch ON rear window defroster.

Voltage tester must light up
If voltage tester does not light up:

If wiring is OK:
If rear window defroster is OK: - Check wiring for continuity between C14 and rear window defroster
using wiring diagram.
- Check rear window defroster using wiring diagram.
- Replace ECM page 01
-265
.
Pa
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put si
gnals, checkin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.25