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Diagnotics Codes from A/C Unit

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I found this in a forum a while back (don't think it was here) and was wondering if the list was ever completed.

No real issue, just interested. It is interesting to look at 20c and find out the margin the speedometer carries.

Hope I didn't post this twice, I hit the "Post New Topic" button, but I don't think anything happened.

First, press and hold the Recirculating Button, then press both Temperature Buttons (+ -). To enter the Diagnostics, you hold down the Recirculating and Air Up buttons simultaneously for 5 sec. The + - will then scroll up/down through a list of 'C' codes. Pressing the Center Vent Button will alternate between the 'C' code with it's actual value. To exit and return to normal operation, press the Auto Button. Here is a list of the available codes:

0c - ERL

1c - Oil Temp

2c - Inside Temp - From the Sensor mounted in the Aspirator Assembly at the side of the Dash

3c - Outside Temp - From the Sensor inside the Air Inlet of the A/C Unit

4c - Outside Temp - From the Sensor in Front Grill of the Radiator. Data is fed to the Climatronic from the Instrument Cluster. When not moving, the Instrument Cluster OBC Temp Display retains it's last setting until moving. This is to prevent heat emanating from the Radiator affecting the Temp Sensor. The Climatronic uses the lower of the two values in determining Fresh-Air Temp.

5c - Outside Temp - matches OBC outside temp display

6c - Coolant Temp

7c - Footwell Discharge Temp

8c - Sun Sensor (dash top) 9c - Sun Sensor

10c- Passenger Compartment Fan Speed

11c- Passenger Compartment Fan Voltage

12c- Temperature Mix Flap Command (1=COLD, 100= HOT)

13c- Temperature Mix Flap Position

14c - Central Flap Command

15c - Central Flap Position

16c - Footwell/Defrost Flap Command

17c - Footwell/Defrost Flap Position

18c - Recirculation Valve Command (1=OFF, 100=RECIRC)

19c - Recirculation Valve Position (feedback)

20c - Vehicle Speed in kph, updates once per second. This is True Speed, not the Speed+Safety Margin displayed by the Speedometer.

21c - Engine RPM in hundreds, also updates once per second

22c - ?

23c - ?

24c - Sun Sensor, Exterior Lights Switch, and Panel Lights control (term.

58 & 58d voltage) - used for A/C Panel Display Illumination

25c - ?

26c - ?

27c - ?

28c - Fan Speed

29c - ?

30c - Engine Run Time in seconds (255max.) (=0Xff)

31c - Timing Counter

32c - Displays Test

33c - Software Version (usually 3.4)

34c - ?

35c - Outside Temp from Inlet Sensor (filtered)

36c - Temp

Edited by rockymount1
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