ECU AUDI A4 1999 B5 / 1.G AC System On Board Diagnostic Workshop Manual

01-3

Notes:

A/C system component locations: engine
compartment page 87
-96
.

A/C system component locations: passenger
compartment page 87
-106
.

If a the display of a newly installed A/C control
head -E87- flashes after switching the ignition
on (for approximately 2 minutes), code the
control head page 01
-57
and execute basic
setting page 01
-52
.

If a replacement control head is not coded after
installation or if an unrecognized code was
entered, code "00042" (4-cyl. gasoline engine
USA) is stored.
Control of A/C compressor, flap motors and fan
motors etc. is not possible when executing
Output Diagnostic Test Mode (DTM), function
03 and basic setting, function 04. A/C control is
possible in all other functions.
Pa
ge 4 of 91 A/C s
ystem, On Board Dia
gnostic
(OBD
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.HA01.01.1

01-16

Safety precautions

If special testing equipment is required during
road test, note the following:

WARNING!

Special testing equipment must always be
secured on the back seat and must be
operated from there by a 2nd person.
If special testing equipment were to be
operated from the passenger seat, there
could be injuries to the person seated there
in the event of an accident and air bag
deployment.
Pa
ge 20 of 91 A/C s
ystem, On Board Dia
gnostic
(OBD
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.HA01.01.1

head and execute basic setting.

- Connect Scan Tool VAG1551 or 1552 in
operating mode -1-, enter address word 08 "A/C
Heating Electronics" and move forward in
program until "select function XX" appears in the
display.

- Switch on printer by pressing the PRINT button
(indicator lamp in button comes on).
Pa
ge 82 of 91 A/C s
ystem, On Board Dia
gnostic
(OBD
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.HA01.01.1