Brake Switch Coding Help

[dpatel710]

My old ecu from my 04 CTT bricked and I ordered an ecu from an 05 CTT and had it "cloned" to match my vehicle. 

 

The ecu communicates with vag-com/durametric and has no error codes but I am unable to start the car as it says "press brake pedal".

 

I checked the brake switch itself, the relay under the driver's seat, and the wiring harness under the driver's side carpet. The brake lights work when I push the pedal. After finding nothing wrong, I continued to search the forums more.

I found that 05's and up use a different brake input than the 04's. (post #54 in the following link). In short, the 04 uses a switch and 05+ use a CAN input from the PSM module. 

https://rennlist.com/forums/porsche-cayenne-forum/476209-help-engine-not-starting-ecu-4.html

 

Is it possible to recode the ECU or PSM to get the two to talk to each other for the brake pedal signal? 

 

Edited October 31, 2017 by dpatel710

[JFP in PA]

The only method I am aware of is to use a PIWIS unit.

[dpatel710]

Jfp, do you have any details on the procedure? With vag-com, I am able to do more than durametric. 

 

I am going to call the shop that worked on the ecu today and see if they are able to help. 

 

Worst case, I’ll call the dealer and explain the situation. Unfortunately, their customer service is not very good which is why I went an alternate route for the ecu. They are the only/closest dealer and it is a 2 hour tow to the location. 

 

Thank you for the help. 

[Loren]

When re-programming a DME the only tool that will work is a Porsche PIWIS with the proper (your car AND the donor car) IPAS codes.

[rik881]

How to get those codes?

[Loren]

11 minutes ago, rik881 said:

How to get those codes?

 

You need to go a Porsche dealership/OPC - show proof of ownership - then ask for your IPAS codes.

They will likely give you a printout. Protect that printout because with those codes someone could steal your car.

Think of them as a combination to a safe.

[dpatel710]

Resolved: Sent the ecu back to the vendor for a reflash. The 05 had a newer version of the software which didn't pick up the brake signal from the brake switch. They transferred the software from my old ecu and the car is running again. 

[Loren]