2004 vs. 2005 LX470 instrument cluster Interchangeability - or lack thereof (2 Viewers)

[excessive]

I have a 2004 LX470 , and the stepper motors in the cluster have failed , specifically on the fuel and voltage gauges. I ended up finding an instrument cluster from a 2005 LX470 with an almost identical spec to mine (no night-view, etc. ) and popped it in. The "new" cluster works great - all he gauges work perfectly, it's so nice to have a working fuel gauge again. The problem is that many of the malfunction lamps are now lit ( maintenance , abs, AT Oil temp, etc) I used my Techstream to scan for any codes, and there are none. I opened up the back panel of the 2 clusters, and compared part numbers on all the chips, and they are nearly identical. only one of the chips had a slightly different part number. I also found one little chip that can be easily swapped over (see pic) , I tried the new cluster even after swapping this little chip, same problem. Anyone have any ideas of why this could be happening ? I doubt there is anything i can do, but I thought I would ask

 

[excessive]

bump, hoping someone has insight on this ???

 

[ODSTbee]

Do all the same lamps stay when the truck is running? My 05 (stock) shows the lamps while the key is on and the engine is off. That might be a stupid question though.

I don't have enough familiarity with the dash to do anything other than speculate. Sounds like something you'd have to start reading signal outputs to troubleshoot.

 

[excessive]

yes, the majority of the lamps stay lit . I am really surprised, i thought for sure the 04 and 05 would be interchangeable. I have a feeling that this unit is "coded" to the ECU and cannot be interchanged