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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 1.2
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)
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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
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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
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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)
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