So here are more details.. sorry my response is lagging, I've not been home lately (tied up with business travel & skiing!)
I have the '06 LED combination lamps installed on my '05, but I had to put in a custom interface circuit to address the issues below:
THE ISSUES:
1. Different Internal/External Wiring
The pin-outs for the 06 combination lamp are different. This image pretty much explains it:
The wiring inside is also different... see the next item.
2. Different Functionality
Instead of four discrete filaments for the different functions (turn, stop, marker, illumination) as in the '03-'05 model, the '06 version has just two 'nodes': an LED array (that takes care of Stop, Turn, and Illumination) and a single-LED side marker. As a result, there is no way to directly connect an '06 LED assembly to an '03-'05 Murano by just changing wire positions; there is a need for additional combinational logic. Three functions (stop, turn, illumination) need to map to a single output. As I mentioned in an earlier post, this appears to be what Nissan did with the FX35--the service manual for that car shows there is a controller unit for the rear combination lights.
3. Problem with Flasher Unit
The '03-'05 Murano has an feature built into the flasher circuitry that causes the turn signals to flash fast if a bulb is burned out. It does this based on the current draw through the entire circuit. The LED array draws much less power than the normal filament bulb (0.6A vs. 1.75A), so the flasher circuit (which appears to be part of the Body Control Module - BCM) thinks a bulb has burned out. Without other changes, the '06 LED combination lamp assy will trip this safety feature. So-- TQT -- to answer your question, yes, I did have to add a resistive load to increase the current draw (and yes, it does have to dissipate about 15W). To me this was a simpler (if not elegant) solution than making changes to the BCM.
THE SOLUTION:
I created an interface box that adapts the '03-'05 Murano signals to the '06 LED assembly. It takes care of the wiring changes, the additional combinational logic, and the flasher circuit problem. I have a pair of them installed in my Murano, and it is working well. I would consider what I have right now a prototype. I'd rather not get into the details of how it works until I've had a chance to test it thoroughly--for example, since this interface unit lives outside with the combination lamp, I had to make sure it would be weather-proof.
This was more of a fun project for me to do--but how many of you are also considering doing this upgrade?