I was trying the climate control diagnostic/hack (hold down recirc and up vent together for 5 seconds) on a friend's '04 GT3, and it wasn't working.

Think that's a MKII difference? Or a GT3 difference?

 

Van,

I am 99% certain that works only on the MK I cars. I couldn't get that to work on my dearly departed '04 996 C2.

 

what does this do?

 

gives you all sort of hidden stats about your car.
on the MK2's you should be able to access that crap thru the OBC with the indicator stalks no?

 

From Ferd - Thanks!

Porsche AC Diagnostics
(undocumented, unsupported feature)

The AC Climatronic unit is actually manufactured by Audi. There is some sort of serial data stream (not CAN) that allows the AC unit to display engine parameters. This works on 1997-2000 boxsters. Same as 996....

To switch from F to C:
Hold down the recirculating button then push both the temperature + - buttons.

To access diagnostics:
Hold down the Recirculating & Air up buttons for 5 seconds. The + - buttons go up and down through the list of "c" codes. The center vent button switches the left display between the "c" code and its actual value. Press the Auto button to exit.

I have yet to verify all these, this info was copied from wonderful people on PPBB!
Here is a list of what can be seen:


0c - ERL
1c - Oil Temp?
2c - Inside temp. Sensor mounted in the aspirator assembly at the side of the dash.
3c - Outside temp. Sensor located inside the air inlet of the A/C unit.
4c - Outside temp. Sensor located in front grill of the radiator. The 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 temperature sensor. The A/C unit uses the lower of the two outside air temp 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, updating only once per second. (real speed, not speed+safety margin as in the speedometer)
21c - Engine RPM in hundreds. This too only updates once per second.
22c - ?
23c - ?
24c - Sun sensor, exterior lights switch & panel lights control (term. 58 & 58d voltage) - used for A/C panel display illum.
25c - ?
26c - ?
27c - ?
28c - Fan speed?
29c - ?
30c - Engine run time in seconds (255 max.)(=0xff)
31c - Timing counter
32c - Displays test
33c - Software version? Mine states 3.4
34c - ?
35c - Outside temp. from inlet sensor (filtered?)
36c - temp?

 

Forget about the climate control "diagnostics" - they are pretty much worthless.
I have both a PST2 and PIWIS tester and those climate control "diagnostics" never match up with the Porsche tool readings.
Buy the Durametric software/cable and get the same information Porsche gets with their expensive diagnostic tools.

 

are you suggesting the reading in the control are not accurate?

(I have been watching the coolant temp)

 

Ed,

I think the readings are accurate only if you have a narrow body 996 with a GT2 wing on the back and some really shiny stuff on the car.

 

I'm in luck!

 

This morning I held down the recric and air up buttons before setting off for work to see if I could liven up my short commute. It changed the settings over to celsius and, since I didn't have the list of what means what (0c,1c,2c, etc.) handy, basically confused me. Now I just want to change it back to fahrenheit and forget about it until I have more time to mess with it. But I can't figure out how to change it back. Any suggestions?

 

Learn metric?

(Non-snarky Edit: It's in the manual somewhere)

 

To switch from F to C:
Hold down the recirculating button then push both the temperature + - buttons.

 

To get out of the diagnostic mode, press "Auto".

 

Couldn't get this one to work. Thanks.

This worked like a charm. I kept trying various combinations of buttons instead of single buttons. Thank you.

 

[QUOTE=JReid;7061787]Couldn't get this one to work. Thanks.


This is an old thread, but I cant change the temp to read ferinheight, its stuck on Celsius.