Tech Article Title
|
Author
|
Date
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Unlocking the Secrets within the Climate Control Panel
|
Mark Quinn
|
1998
|
Changing Degree Temperature Display
Press and hold the recirculation button. Then press the temperature up
("+") button to switch between degrees Celsius & Fahrenheit on the
Climate Control Temperature and Instrument Panel Outside Temperature displays.
Accessing On-Board Diagnostic codes
Press and hold the recirculation button. Then press the manual flow control
up arrow. You should see a 1c. Press the temperature up ("+") or
down ("-") buttons to select a code number. Then press the recirculation
button again. The value should display. Press the temperature
up or down button again to display another code.
NOTE: Air Flow Motor (V 71) and Potentiometer (G 113) are not
installed in USA/Canada vehicles. Disregard values displayed for these
components.
Code |
Displayed Value |
1 |
System malfunction - displayed as a Diagnostic Trouble Code (DTC),
see chart below |
2 |
Digital value of Interior Temperature Sensor, in Headliner
(G 86) |
3 |
Digital value of Interior Temperature Sensor, in Instrument
Panel (G 56) |
4 |
Digital value of Fresh Air Intake Duct Temperature Sensor
(G 89) |
5 |
Digital value of Outside Air (Ambient) Temperature Sensor
(G 17), front |
6 |
Digital value of Outside Air (Ambient) Temperature Sensor |
7 |
Digital value of Ambient Temperature Sensor At Fresh Air
Blower (G 109) |
8 |
Digital value of Temperature Regulator Flap Motor Potentiometer
(G 92) |
9 |
Delta value of Temperature Regulator Flap |
10 |
Non-corrected specified value of Temperature Regulator
Flap |
11 |
Digital value of Central Flap Motor Potentiometer (G 112) |
12 |
Specified value of Central Flap |
13 |
Digital value of Footwell/Defroster Flap Motor Potentiometer
(G 114) |
14 |
Specified value of Footwell/Defroster Flap |
15 |
Digital value of Air Flow Flap Motor Potentiometer (G 113) |
16 |
Specified value of Air Flow Flap |
17 |
Vehicle Speed (km/h) |
18 |
Actual Air Blower voltage (Volts) |
19 |
Specified Fresh Air Blower voltage (Volts) |
20 |
A/C Compressor (A/C Clutch) voltage (Volts) |
21 |
Number of low voltage occurrences, non-transient |
22 |
Cycle condition of A/C Refrigerant High Pressure Switch
(F 118) |
23 |
Cyclings of the A/C Refrigerant High Pressure Switch (F
118) |
24 |
Cyclings of the switches, absolute non-fluctuating |
25 |
Analog/Digital value, Kick-Down Switch |
26 |
Analog/Digital value, Engine Coolant Temperature (ECT)
Warning Light |
27 |
Coding value |
28 |
Engine Speed (RPM) |
29 |
A/C Compressor speed in rpm (Equals Engine Speed x 1.28) |
30 |
Software version |
31 |
Display check (all segments of A/C Control Head display
light up) |
32 |
Potentiometer malfunction counter, Temperature Regulator
Flap |
33 |
Potentiometer malfunction counter, Central Flap |
34 |
Potentiometer malfunction counter, Footwell/Defroster Flap |
35 |
Potentiometer malfunction counter, Air Flow Map |
36 |
Feedback value, cold end-stop, Temperature Regulator Flap
Motor Potentiometer (G 92) |
37 |
Feedback value, hot end-stop, Temperature Regulator Flap
Motor Potentiometer (G 92), max. stop |
38 |
Feedback value, cold end-stop, Central Flap Motor Potentiometer
(G 112) |
39 |
Feedback value, hot end-stop, Central Flap Motor Potentiometer
(G 112) |
40 |
Feedback value, cold end-stop, Footwell/Defroster Flap
Motor Potentiometer (G114) |
41 |
Feedback value, hot end-stop, Footwell/Defroster Flap Motor
Potentiometer (G114) |
42 |
Feedback value, cold end-stop, Air Flow Map Motor Potentiometer
(G 113) |
43 |
Feedback value, hot end-stop, Air Flow Map Motor Potentiometer
(G 113) |
44 |
Vehicle operation cycle counter |
45 |
Calculated interior temperature (internal software, in
digits) |
46 |
Outside (ambient) temperature, filtered, for regulation
(internal software) |
47 |
Outside (ambient) temperature, unfiltered, (internal software,
in deg C) |
48 |
Outside (ambient) temperature, unfiltered, (in digits) |
49 |
Malfunction counter for speedometer (vehicle speed) signal |
50 |
Standing time (in minutes) |
51 |
Engine Coolant Temperature (ECT) in deg C |
52 |
Graphics channel 1 - A/C compressor switch-off conditions
are identified by illuminated segments of the "88.8" display. See
chart below. |
53 |
Graphics channel 2 - Climate system electrical outputs
are identified by illuminated segments of the "88.8" display. See
chart below. |
54 |
Control characteristics |
55 |
Outside (ambient) temperature, in deg C or deg F depending
on setting on A/C control head |
56 |
Temperature in deg C, from Interior Temperature Sensor,
in Headliner (G 86) |
57 |
Temperature in deg C, from Interior Temperature Sensor,
in Instrument Panel (G 56) |
58 |
Temperature in deg C, from Fresh Air Intake Duct Temperature
Sensor (G 89) |
59 |
Temperature in deg C, from Outside Air (Ambient) Temperature
Sensor (G 17), front |
60 |
Temperature in deg C, from Ambient Temperature Sensor At
Fresh Air Blower (G 109) |
61 |
Software version (latest) |
Diagnostic Trouble Code Meanings
Diagnostic Trouble
Code (Sensor) |
Malfunction Description |
00.0 |
No malfunction present |
02.1 (G86) |
Interior Temperature Sensor, in
Headliner, static open, *02.1 (see below) |
02.2 |
Interior Temperature Sensor, in
Headliner, static short, see 02.1 |
02.3 |
Interior Temperature Sensor, in
Headliner, sporadic open |
02.4 |
Interior Temperature Sensor, in
Headliner, sporadic short |
03.1 (G56) |
Interior Temperature Sensor, in
Instrument Panel, static open, see 02.1 |
03.2 |
Interior Temperature Sensor, in
Instrument Panel, static short, see 02.1 |
03.3 |
Interior Temperature Sensor, in
Instrument Panel, sporadic open |
03.4 |
Interior Temperature Sensor, in
Instrument Panel, sporadic short |
04.1 (G89) |
Fresh Air Intake Duct Temperature
Sensor, static open, *04.1 (see below) |
04.2 |
Fresh Air Intake Duct Temperature
Sensor, static short, see 04.1 |
04.3 |
Fresh Air Intake Duct Temperature
Sensor, sporadic open |
04.4 |
Fresh Air Intake Duct Temperature
Sensor, sporadic short |
05.1 (G17) |
Outside Air (Ambient) Temperature
Sensor, front, static open, *05.1 (see below) |
05.2 |
Outside Air (Ambient) Temperature
Sensor, front, static short, see 05.1, *05.2 (see below) |
05.3 |
Outside Air (Ambient) Temperature
Sensor, front, sporadic open |
05.4 |
Outside Air (Ambient) Temperature
Sensor, front, sporadic short |
06.1 (G110) |
Engine Coolant Temperature (ECT),
A/C static open, *06.1 (see below) |
06.2 |
Engine Coolant Temperature (ECT),
A/C static short, see 06.1 |
06.3 |
Engine Coolant Temperature (ECT),
A/C sporadic open |
06.4 |
Engine Coolant Temperature (ECT),
A/C sporadic short |
07.1 (G109) |
Ambient Temperature Sensor at
Fresh Air Blower, static open, *07.1 (see below) |
07.2 |
Ambient Temperature Sensor at
Fresh Air Blower, static short, see 07.1 |
07.3 |
Ambient Temperature Sensor at
Fresh Air Blower, sporadic open |
07.4 |
Ambient Temperature Sensor at
Fresh Air Blower, sporadic short |
08.1 (G92) |
Temperature Regulator Flap Motor
Potentiometer, static open, *08.1 (see below) |
08.2 |
Temperature Regulator Flap Motor
Potentiometer, static short, see 08.1 |
08.3 |
Temperature Regulator Flap Motor
Potentiometer, sporadic open |
08.4 |
Temperature Regulator Flap Motor
Potentiometer, sporadic short |
08.5 |
Temperature Regulator Flap, static
block, *08.5 (see below) |
08.6 |
Temperature Regulator Flap Motor
Potentiometer, malfunction |
08.7 |
Temperature Regulator Flap, sporadic
block |
11.1 (G112) |
Central Flap Motor Potentiometer,
static open, *11.1 (see below) |
11.2 |
Central Flap Motor Potentiometer,
static short, see 11.1 |
11.3 |
Central Flap Motor Potentiometer,
sporadic open |
11.4 |
Central Flap Motor Potentiometer,
sporadic short |
11.5 |
Central Flap, static block, *11.5
(see below) |
11.6 |
Central Flap Motor Potentiometer,
malfunction |
11.7 |
Central Flap, sporadic block |
13.1 (G114) |
Footwell/Defroster Flap Motor
Potentiometer, static open, *13.1 (see below) |
13.2 |
Footwell/Defroster Flap Motor
Potentiometer, static short, see 13.1 |
13.3 |
Footwell/Defroster Flap Motor
Potentiometer, sporadic open |
13.4 |
Footwell/Defroster Flap Motor
Potentiometer, sporadic short |
13.5 |
Footwell/Defroster Flap, static
block, *13.5 (see below) |
13.6 |
Footwell/Defroster Flap Motor
Potentiometer, malfunction |
13.7 |
Footwell/Defroster Flap, sporadic
block |
15.1 (G113) |
Air Flow Flap Motor Potentiometer,
static open, *15.1 (see below) |
15.2 |
Air Flow Flap Motor Potentiometer,
static short, see 15.1 |
15.3 |
Air Flow Flap Motor Potentiometer,
sporadic open |
15.4 |
Air Flow Flap Motor Potentiometer,
sporadic short |
15.5 |
Air Flow Flap, static block, see
*15.5 (see below) |
15.6 |
Air Flow Flap Motor Potentiometer,
malfunction |
15.7 |
Air Flow Flap, sporadic block |
17.0 |
Vehicle Speed Signal faulty |
18.1 |
Fresh air blower voltage, static |
18.3 |
Fresh air blower voltage, sporadic |
20.1 |
A/C compressor voltage not OK
- static, *20.1 (see below) |
20.3 |
A/C compressor voltage not OK
- sporadic |
22.1 (F118) |
A/C Refrigerant High Pressure
Switch, static open, *22.1 (see below) |
22.3 |
A/C Refrigerant High Pressure
Switch, sporadic open |
22.5 |
A/C Refrigerant High Pressure
Switch, 120X open, *22.5 (see below) |
29.1 |
Belt slip detection "soft", static |
29.2 |
Belt slip detection "hard", static |
29.3 |
Belt slip detection "soft", sporadic |
29.4 |
Belt slip detection "hard", sporadic |
Diagnostic Trouble
Code Notes:
*02.1 |
Digital default value of 128 is
programmed if sensor fails |
*04.1 |
Value supplied by Temp. Sensor
is used if sensor fails |
*05.1 |
Value supplied by Temp. Sensor
is used if sensor fails |
*05.2 |
Digital default value of 128 is
programmed if sensors G89 & G17 both fail |
*06.1 |
Engine Coolant Temperature is
calculated is sensor should fail or is not installed; diagnosis occurs
only above 0 degrees Celsius |
*07.1 |
Programmed corrective value =
0 |
*08.1 |
Temperature Regulator Flap Motor
will no longer be controlled automatically; manual adjustment only |
*08.5 |
Motor is cycled; software attempts
to eliminate block |
*11.1 |
Central Flap Motor will no longer
be controlled automatically; manual adjustment only |
*11.5 |
Motor is cycled; software attempts
to eliminate block |
*13.1 |
Footwell/Defroster Flap Motor
will no longer be controlled automatically; manual adjustment only |
*13.5 |
Motor is cycled; software attempts
to eliminate block |
*15.1 |
Digital value is internally programmed
for limp-home mode |
*15.5 |
Motor is cycled; software attempts
to eliminate block |
*20.1 |
Compressor remains off until voltage
is greater than 10.8V for at least 25 seconds |
*22.1 |
Compressor remains off until switch
closes |
*22.5 |
Compressor re-engagement circuit,
VAG 1551 Scan Tool function |
OBD Channel 52 - A/C Compressor
switch-off codes
If an A/C compressor switch-off condition exists, a segment of the "88.8"
display, indicated below as an alpha-numeric code, will illuminate.
Segment
|
Condition |
a1
|
Slippage or blockage, A/C Refrigerant High
Pressure Switch, 120x off |
b1
|
Engine Speed (RPM) less than 200 - 500 |
c1
|
Engine Speed (RPM) greater than 6000 |
d1
|
Engine Speed (RPM) greater than 6000 |
e1
|
System function OK |
f1
|
System function OK |
a2
|
A/C manually switched off (A/C standby canceled) |
b2
|
low voltage |
c2
|
Kick-down switch, compressor off for 12secs
max. |
d2
|
Engine Coolant Temperature (ECT)
warning light switched |
e2
|
A/C Refrigerant Low Pressure Switch
(F73) |
f2
|
A/C Refrigerant High Pressure
Switch (F118) |
a3
|
ECON mode selected |
b3
|
OFF selected |
c3
|
Outside (ambient) temperature
too low |
d3
|
Engine management system (compressor
will remain off for 3 -12 seconds) |
e3
|
High pressure occurrences more
than 30 times |
f3
|
Ambient Temperature Sensor at
Fresh Air Blower (G109) less than 27 degF (-3 degC) |
g1,g2,g3
|
System function OK (g1+g2+g3 must
illuminate simultaneously to indicate system is OK) |
Decimal Point
Lit
|
A/C compressor ON |
Decimal Point
Unlit
|
A/C compressor OFF |
OBD Channel 53 - Climate system
electrical output codes
When a NO system electrical output is activated, a segment of the "88.8"
display, indicated below as an alpha-numeric code, will illuminate. The
decimal point in the "88.8" display will not illuminate
in this channel.
Segment
|
Condition |
a1
|
Fan for interior temperature sensor |
b1
|
Fresh air/recirculation flap closed
(recirculation mode) |
c1
|
Heater valve closed |
d1
|
Bi-directional wiring harness |
e1
|
A/C compressor ON |
f1
|
coolant fan first speed ON |
a2
|
Air flow flap open |
b2
|
Air flow flap open |
c2
|
Air flow flap closed |
d2
|
Footwell/Defroster flap in "Footwell"
position |
e2
|
Footwell/Defroster flap in "Footwell"
position |
f2
|
Footwell/Defroster flap in "Defroster"
position |
a3
|
Central flap in "instrument panel
outlet" position |
b3
|
Central flap in "instrument panel outlet"
position |
c3
|
Central flap in "footwell outlet/defrost"
position |
d3
|
Temperature flap in "cold air"
position |
e3
|
Temperature flap in "cold air"
position |
f3
|
Temperature flap in "warm air"
position |
g1,g2,g3
|
System function OK (g1+g2+g3 must illuminate
simultaneously to indicate system is OK) |
|