Coding Issues After Instrument Cluster Swap

[yerbito]

Hi everyone,

I’m working on fixing several DTCs on my 2003 Cayenne, which I acquired after it had been abandoned for quite some time. It needed a lot of attention to get it back in working condition. The previous owner had replaced the instrument cluster, but I noticed that the VIN on the cluster didn’t match the car’s VIN, which seems to be causing issues.

After fixing several problems — like the airbag ECU that wasn’t communicating with the DME because the CAN bus data cables were swapped,, later I need cleaning out the front airbag sensors, which had water inside — I’m now dealing with a few more issues, including errors in the ParkAssist and tire pressure monitoring modules. These errors seem to be related to the communication problems with the instrument cluster. Although I can usually clear these errors, but the HVAC system is giving me error 1299, and I can't clear it. Additionally, most of the time, I receive a timeout from this module.

I’ve also been troubleshooting temperature sensor issues. I tried both a new sensor and a used one from a scrapyard, and both always show 40°C. However, I confirmed that both sensors vary their resistance correctly in hot and cold water, so they seem to be fine. When I disconnect the sensor, the cluster shows around 18°C, which is almost accurate. PIWIS, however, shows 0°C for outside temperature in the HVAC’s real-time data.

After updating the VIN in the PIWIS coding section, I noticed that SG-Tausch entries 3, 6, and 7 were not configured. This might explain the ongoing errors in communication with the other modules — and probably also the HVAC timeouts.

I would like know if someone konows exactly what values should be entered.

Just so you know: one of the attached photos shows the VIN in case it helps in identifying the correct settings.

Thanks a lot in advance for any help!

 

[Loren]

What is the part number on the two clusters?

If they are not the same they might not be compatible.

PM me the cars VIN and I will see what is supposed to be in the car.

[yerbito]

2 hours ago, Loren said:

What is the part number on the two clusters?

If they are not the same they might not be compatible.

PM me the cars VIN and I will see what is supposed to be in the car.

Thanks so much for your answer.

I'm sorry, but I don't know which instrument cluster the car originally had. It was abandoned when I bought it, and I'm restoring it now, so I don't have much information about its previous history. I do know that the cluster was replaced at some point, because the VIN stored in it is different from the vehicle's actual VIN.

 

My car's VIN name is: WP1ZZZ9PZ4LA43989

 

 

The VIN stored in the configuration when I bought the car was: WP1ZZZ9PZ4LA46674

 

 

Instrument Cluster part numer is: 7L592870B (RB4): 

 

 

[Loren]

That car can use:  955 641 204 01 or 955 641 204 02 and only those two.

 

If the cluster does not have one of those numbers it may not be able to be programmed.

 

[yerbito]

Thanks again. In my previous message I wrote the part number incorrectly. The correct one is: 7L5920870B.

I checked the label on the cluster (photo attached), but I don’t see any of the numbers you mentioned.

I looked up your part numbers on Google, and on some used parts websites they claim they’re compatible with mine, but honestly, I’m not sure if that’s accurate.

Several of those pages list both references (yours and mine) for the same cluster, and the label on those units also shows RB4, just like mine.

Do you think it will be possible to program this cluster?

[Loren]

The two part numbers I gave come from Porsche's replacement parts system (PET) - specifically for your VIN.

[yerbito]

6 hours ago, Loren said:

The two part numbers I gave come from Porsche's replacement parts system (PET) - specifically for your VIN.

The only thing I can think of is that the part numbers for the US and Europe are different, because the only instrument clusters I can find are with my part number.

 

 

I was checking something on the car using PIWIS, and when I looked into the Gateway CAN module, I found something strange.

As far as I know, in my car the gateway is integrated in the instrument cluster, but I’m not sure if that’s for the CAN, the comfort system, or both.

The thing is, all modules show as “OK” except for the Infotainment CAN (I don’t have a radio at the moment) and the Comfort CAN. That last one confuses me, because I’m not sure if it’s supposed to be integrated in the cluster or not. I think it is.

The weirdest part is that, while I was doing these checks — engine off, handbrake on, gear lever in P — the speedometer needle suddenly started rising, and I got several alerts about the handbrake being on and the hood being open.

In my car, is the Comfort CAN supposed to be handled by the instrument cluster?

Also, what exactly is the “rear convenience system”?