955 A/C control unit coding after replacement?

[royxaxa]

Hi guys,

I had some issue with the A/C in my 04 CTT. mostly the noise also some vents did not output consistent temperature.

so I replaced 3 servo motors according to the error code. output temp. seems alright after that. but the noise was still there.

so last month I replaced the control unit. everything seemed to be working in the first week. but now the noise came back. constant squeaky rat running kind of noise.(A/C function works without any obvious problem in terms of air temp and air flow rate)

I plugged in my Durametric this morning and found the following codes:

1042 control module not coded

1087 basic setting not implemented

my question is: do I need to take the car to dealer to re-program the control module? would that solve the noise problem?

please help.

thanks,

Roy

[Loren]

Fault code 1042 -- Control module not coded

Possible cause of fault

- No or incorrect basic setting (no coding written in off-road stabilizer control module)

Note: This fault code is only issued if a new, 'uncoded' control module was installed, which does not yet contain any coding

Fault code 1087 -- No Basic Setting

Possible cause of fault

- Air-conditioning system was not calibrated

Can you clear these codes?

Is so, I would clear them and see if they come back.

[royxaxa]

thanks Loren

I tried to clear the codes but it came back and my Durametric stuck sometimes. I will try to clear it again.

if I can not clear the faulty codes, what would be the next step?

Roy

[Loren]

Do you have the off-road stabilizer package on your car?

If you do, then I would have the dealer/OPC try re-programming those modules before replacing any of them -- and of course make sure your battery is less than 4 years old and strong (do a load test).

Even a slightly weak battery has caused some strange things to happen in Cayennes.

[royxaxa]

Loren,

how do I tell if I have the off-road stabilizer package?

my vin is wp1ac29p14la90253

thanks a lot!

Roy

[Loren]

I sent you your options list.

You can try to have someone with a PSTZ2 or PIWIS re-program those modules and run further tests.

[royxaxa]

thanks Loren, you are the man!

[wvicary]

Why do you think that would cause a squeak noise? Have you checked the fan motor?

[royxaxa]

wvicary,

do you mean the big blower motor? it seems that the noise is from behind the PCM system rather than the passenger side foot well.

I changed 3 flap step motors according to the error code from Durametric. it did solve the problem of un-even temperature at front outlets.

let me know what do you think, thanks

Roy

[hahnmgh63]

How much of a pain was it to change those motors? I have one fault there and had the fresh air flap motor but that one was easy to change down by the Pollen filter.

[royxaxa]

The driver side ones are painful need to remove kessy and some other controllers in the way

Passenger side is okay but still pretty awkward