Cayenne - Air Con 1299 Gateway Implausible Signal - HELP

[eshaze]

2004 Cayenne S - With optional Xenon headlights and Air Suspension.

 

Hello everyone, looking for some help, my AC compressor is not engaging and therefore no cold air, the blower motor functions as normal, searched Renntech, and Rennlist, found similar issues but no definitive resolved problems.

 

Steps i've taken so far:

Checked for blown fuses/non functioning relay's, all functioning

1. Right support (F23 - 10A)

2. Relay position (R3 - 40A)

3. Water box (FS11 - 15A)

 

Ran Durametric,  cleared all codes within Air-conditioning module and immediately get - 1299 current fault code - Gateway Implausible Signal - It appears something is causing the A/C compressor to command OFF instead of ON, and cannot cycle it on via durametric.

 

Could this be an AC control unit issue?  Any help greatly appreciated ....

 

Thanks

Sam

 

 

[Brett968]

Have you checked for faults in the gateway control module?

 

Brett