Accessing On-Board Diagnostic codes

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)

 
 

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Diagnostic Trouble Code Meanings

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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