check engine light AUDI A4 1996 B5 / 1.G AC System Electrical Testing Workshop Manual

01-137

Adapter cable VAG1598/11
LED Voltage tester VAG1527B
Test
Step VAG1598
socket Test of
Test
conditions
- additional
work Specified Value
Corrective action
1.9 term.15 1) +
33 Signal for time
span ignition
off
Ignition
on - LED lights up - Diagnose and repair short or open
circuit in wiring/connections using wiring
diagram.
1.10 term.15 1) +
33 Signal for time
span ignition
off Ignition
on



- Start
engine. - LED lights up



- LED flickers briefly
(time signal) and then
lights up again - Diagnose and repair short or open
circuit in wiring/connections using wiring
diagram.
- Check signal from instrument cluster.
1) Terminal 15 (ignition) is available at -E87- connector -D-, terminal -9-.
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01-150
List of changes to electrical tests, 1998 VAG1527B voltage tester
VAG1598/11 adapter cable connected
Test
step VAG1598
sockets Test of
Test
conditions
- additional
operations Specified
value Corrective action
1.9 33 +
GND Signal for
"ignition off"
period
Ignition
switched on LED on voltage tester lights
- Repair open circuit or
short circuit according to
wiring diagram.
1.10 33 +
GND Signal for
"ignition off"
period Ignition
switched on
- Start engine.LED in voltage tester lights up
When starting engine, LED briefly
flickers in voltage tester (time signal)
and then lights constantly - Repair open circuit or
short circuit according to
wiring diagram.
- Check instrument cluster.
Note:
Test steps 1.9 and 1.10 apply only for vehicles beginning m.y. 1997 (A/C control head with Part No. 8L0 820 043 up to Part
No. index letter "C").
Pa
ge 44 of 47 A/C s
ystem, electrical testin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.HA01.01.2