window AUDI A4 1999 B5 / 1.G AFC Engine Auxiliary Input Signals Checking Workshop Manual
Page 1 of 37
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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Page 3 of 37
24-89
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
ge 3 of 37 Auxiliar
y in
put si
gnals, checkin
g
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