Reading Faults - VW Climatronic from Hella (Articles)

Self-diagnosis of the VW Climatronic from Hella.

Here are some tips on how to extract useful information from the VW Climatronic control panel. The special charm lies in the fact that no diagnostic equipment is required; for example, you can easily read one or more values from the Climatronic at the traffic light.

The description of the fault reading, actuator test, and onboard diagnostics refers to a component from the company Hella, as shown below. It can be found, for example, in the Golf IV and the Passat 3B/3BG. In these specified vehicles, identical control units from VDO are also installed, which are connection-compatible, but have different self-diagnostic requirements.


Reading Internal Error Memory:

Start the engine.
Activation of reading mode: Press and hold the "ECON" and " recirculation" buttons for at least 2 seconds.

Now, if a possible error exists, it will be displayed. Pressing "warmer" will display the next error. After all error codes have been displayed, "000" appears.

Is no error present, the code "444" will appear.

Clear Fault Memory: After the end of the error display (indicated by 000, meaning no further errors), the fault memory can be cleared: Press and hold the "ECON" button for at least 2 seconds. Confirmation message displayed: "444".

Exit Mode: Briefly press the "ECON" button.


List of possible errors:

(Data source / Error location / Error type)

FFFF Control Unit 0x25
0119 Speed Sensor 0x25
0214 Power supply 0x06, 0x07
021A Reference Voltage 0x06, 0x07
0510 Temperature Sensor Blow-off Mannan Stream (1296) 0x1d, 0x1e
0511 Temperature Sensor Air Vent Footwell (1297) 0x1d, 0x1e
030B Temperature Sensor Outdoor Temperature Bumper 0x1d, 0x1e
0313 Temperature Sensor Fresh Air Intake Duct 0x1d, 0x1e
0332 Temperature Sensor Evaporator 0x1d, 0x1e
0333 Refrigerant Pressure Sensor
0318 Air Conditioner Switch 0x23
031D Photosensor for Sunlight 0x1d, 0x1e
0382 Compressor Valve
04F7 Thermostat Motor 0x25
04F8 Central Valve Actuator 0x25
04F9 Fresh Air Blowers 0x25
04FA Actuator for Stamping Door 0x25
025B Foot/Defrost Door Actuator 0x25
04B6 Standby Signal 0x25
0538 CAN-Bus
0513 Gateway
053D Combo
04AE Gateway- Data Base Version
0414 Steuergerät not coded 0x23
043F Initial setup not performed 0x23


Staff Member Test

All Climatronic elements are activated for testing.

Prerequisite:
Ignition on, engine off, vehicle stationary, voltage at terminal 15 < 15.5 V

Initiating the Stool Test:
Press and hold the "ECON" and "UMLUFT" buttons simultaneously (as shown in the display when reading the fault memory), while also turning the ignition on. Continue holding the button combination for at least 2 seconds. In the Climatronic display, all segments are now visible.

Description: In the now automatically running actuator test (duration approx. 30s), the actuators are controlled according to the time, as defined. Furthermore, the periphery of the control unit (sensors, motors, fresh air blowers, pressure switches) is diagnosed, provided that the diagnostic requirements are met (see diagnostic manual), and the actuators are controlled by the system software before and after the actuator test. During the actuator test, all buttons are locked and all segments on the LCD are activated. An initiated actuator test cannot be terminated via the keyboard or the VAG tester. After completing the self-test, the control unit automatically switches to the "Read Diagnostic Memory" mode (see above).

Exit Mode: Briefly press the "ECON" button.



OnBoard Diagnostic

OBD can also be accessed while the engine is running and during driving.

The diagnostic process begins by simultaneously pressing the "ECON", "cooler", and "Fan smaller" buttons.
Using the "warmer" and "colder" temperature buttons, the diagnostic channels are scrolled through.


Note:

There are various channel assignments. If a valid speed signal can be read on channel 16 during the onboard diagnosis, then the following description applies. Other channel assignments sometimes use channel 17 or 19 for the speed signal. Then the following list does not apply.

Depending on the vehicle, not all of the listed channels may be available.

In my Golf IV from 07/2002 with Climatronic C 2.0.0, part number 3B1 907 044 C, the channels described further down in this article - as far as it is verified - match the displays.


(DIAGNOSEKANAL / INDICATED SIZE / DIMENSION)

0 Program Number Dig.
1 Indoor Temperature °C
2 Solar intensity delayed * 10 W/m2
3 Solar intensity * 10 W/m2
4 Outdoor temperature delayed °C
5 °C Bumper °C
6 Outdoor Temperature Intake Channel °C
7 Recommended Blast Techniques Luggage compartment °C
8 Recommended Options MAS °C
9 SOLL Fan Speed * 0.1 V
10 IS - Fan Blades * 0.1 V
11 SOLL_Temp.-Klappe Digital
12 SOLL_Zentral-Klappe Dig.
13 DIGITAL CONTROL/REGULATION VALVE
14 SOLL_Foot/Def. Cover Digital
15 Motor Running Time S
16 km/h Speed
17 START_AP Dig.
18 Units/Fresh Air Threshold Digital
19 Compressor-Off Code, see Appendix
20 PI_STELLMAX Discharge Regulation Dig.
21 INT_STELL Display Control. Dig.
22 Epsilon Exclusion Regulation Dig.
23 Recommended maximum temperature for the "Is-Ausblast" (emergency shutdown)
24 Recommended Blast Temperature °C
25 - End Stop Temperature Door Digital
26 RMP_Temp.-Klappe Digital
27 + End Stop Temperature Door Digital
28 - End Stop, Central Valve, Digital
29 RMP_Zentral-K. Dig.
30 + End Stop, Central Door, Digital
31 - End Stop for Valve/Staul-Clap, Digital
32 RMP_Uml/Staul.-Klappe Dig.
33 + End Stop for Valve/Stopper Plate, Digital
34 - End Stop, Foot/Def. Door, Digital
35 RMP_Foot/Def. Door Digital
36 + End Stop, Foot/Defect Classifier, Digital
37 Minutes Standby Time (255 = no Telegram)
38 Compressor-PWM Dig (0...200)
39 Soll-Evaporator Temperature (°C)
40 Evaporation temperature in °C
41 I-Stell Evaporator Digital
42 Epsilon Evaporator Dig.
43 Refrigerant Pressure (in bar)
44 BiLevel/MAS Threshold Digital
45 Engine Temperature °C
46 Is-Compressor Current mA
47 Compressor current (mA)
48 Compressor Max. Current mA
49 Compression Speed 100/min
50 Cooler Fan Lubrication Signal %
51 Windshield Wiper Modes 0 = off; 1 = Intermittent; 2 = continuous
52 FDK Adjustment based on Windshield Wiper - Digital.
53 Fan-speed correction depending on windshield * 0.1V
54 Basic Number
55 VW Number
56 HELLA-Number
57 Test-1
58 Test-2
59 Test-3
60 Test-4

Extended diagnostic channels for CAN variants
DIAG.-KANAL SIZE AS INDICATED
Reception Data
61 available
62 Connector 15 Bit
63 Hot Light Bit
64 Outdoor temperatures filtered °C
65 Climate Shutdown Bit
66 RPM x 10
67% Reduction
68 Bit Cooling Channel
69 Country Variant 2 = USA / 1 = Japan / 0 = Rest

Sent data
70 available
71 Heaters (PTC on) Bit
72 Compressor (Compressor 1) Bit
73 Turn off the heating
74 °C (exterior temperature) Unfiltered water tank, °C
75 Compressor Load Nm
76 Fan Load %
77 Cooling Fans %
78 Customer Service Errors Bit (Error Storage)

Compressor Off Code (Appendix to Diagnostic Channel 19)
Compressor Shutdown Code
Compressor Shutdown Condition
0 None
1 Hypertension Event
2 lbs def + Uist < 3V
3 Low-Pressure Event
5 4s after engine start
6 ECON Business
7 OFF-Operation
8 Function of Outdoor Temperature
10 Low Voltage
11 Engine Temperature > 118°C
12 Motronics Interface
13 Pages. Klemme 15 > 17V
14 Function Evaporator Temperature.
15 - No vehicle coding.
16 Comp. Current
17 Pressure sensor def. (only with external, regulated) Compressor)
18 RPM (only for B5W8))



System Error

Was wurde im letzten Fahrzyklus erkannt? Alle Segmente auf dem LCD blinken beim Einschalten der Zündung für 15 Sekunden mit einer Frequenz von 2 Hz.

Following errors detected in the stationary state (Error counter = 50) lead to the system error:

- VAG Tester function. 04 Basic setting not initiated
- VAG Tester function. 07 Parameter coding not performed
- External sensor (intake channel) and external sensor (bumper) are defective
- Button / Sensor defective
- Internal sensor defective
- Reference voltage (ext.) Sensorspg.)



Specific channel guidelines

The speed displayed on Channel 16 is not overly accurate, despite its digital display. It primarily serves to regulate the amount of incoming fresh air to be adjusted to the vehicle's speed - nothing more and nothing less.

Using the evaporator temperature provided in Channel 40, it is possible to roughly determine whether the cooling performance of the system is still functioning correctly. Regardless of any subjective feelings of the occupants, an objective measurement of the achieved temperature is possible without the need for later mixing with warm air. The evaporator temperature should also reach single-digit ranges within a few minutes at the "Lo" setting, even at maximum heat, and should reach a steady value of around 3 °C within a maximum of 30 minutes of continuous operation.