Steering buttons wiper indicators not working

[Pkcayenne]

Hi cayenne 04 CTT weirdness the below list of functions was intermittent now nothing works 

 

buttons on steering wheel 

tiptromic button on steering wheel 

wipers

cruise control 

pin out adjustment 

 

all functionality on the steering wheel except it steers perfectly all fuses are good errors as attached any ideas was intermittent

Edited August 20, 2017 by Pkcayenne
Picture

[Loren]

Whenever I see weird electrical problems on Cayenne - I suggest load testing the battery and checking the battery specific gravity on each cell.

A low or weak battery or poor chassis ground causes all kinds of weird electrical problems on the Cayenne.

[Brett968]

Sounds like a CAN communications problem. Check the fault codes stored in the "Gateway" computer.

 

Do you an aftermarket radio by chance? If it is wired incorrectly it could kill the CAN line. Correcting the wiring will rectify the problem in that case.

[Pkcayenne]

Hi I have an aftermarket connected has been good for the last few years. When I disconnect the fuse to the stereo all goes off, any idea where the gateway computer is ? Or if I can isolate the can issue 

[Brett968]

Even if it is hooked up correctly the radio may have developed a fault that is taking out the CAN line. Is your aftermarket radio interfaced with the steering wheel controls?

 

I would do this. First, check the "Gateway" computer for fault codes. Then -- depending on the fault codes -- pull the stereo and disconnect the CAN lines. You don't have to know which exact wires are the CAN lines, just pull all the connections to the stereo. If your radio uses a separate CAN adapter then be sure to disconnect the factory wiring from that also. After doing this, see if the problem is still present.

[Pkcayenne]

Hi stupid question is the can box rectangular which would connect into the buttons on the steering wheel ? If this has gone bad on the kenwood aftermarket would it kiss turn signals and wiper functions also 

[Pkcayenne]

Picture of the error I pulled 

[Brett968]

Are you able to communicate with the "Gateway" controller using Durametrics? It isn't clear to me if your vehicle has the gateway built into the instrument cluster or if it is a separate unit. If you can't communicate with the gateway then I suppose it is safe to assume that the gateway is internal to the instrument cluster on your car. In that case, then what you posted is all the diagnostic info available.

 

I have no idea what the Kenwood CAN interface might look like. Can you find some part number on it that you could google?

 

I'll briefly try to explain the topology of the CAN system on the Cayenne. There are three separate CAN networks: Drive, Comfort, and Infotainment. Each network uses a twisted pair of wires to allow communication between all computers on that respective network. Any fault in the wiring can bring down the whole network (limited communication is available in a single-wire "emergency" mode). This should make it obvious why powertrain controllers are on a different network then things like power seats, etc. The networks can exchange messages between other networks through the gateway.

 

469 is telling as it suggests that you have a wiring problem on the CAN Infotainment network. The Infotainment network includes PCM 2.1, wipers (?), and compass. This explains your wipers and radio controls not working. It also explains error code 459. I don't understand how it could trigger the first three fault codes as these are related to the Comfort CAN network but then again it's not unusual for faults to trigger "limp" algorithms with rather unexpected behavior. Anyways, I thought pulling the aftermarket radio CAN interface was an obvious first thing to check as it's one of the few modules using the Infotainment CAN network and you are clearly indicating a wiring fault on this network.