Chances are they forgot to connect the ambient light sensor when they re-ftitted your dash. Easy fix, but if you are going back there, you can just get them to look at it if you want. As for your knocking issues etc, it sounds like the same issue I have where my steering rack mounts are stuffed, but I think mine is more of a rarer case that doesn't happen to many Aurion's from the sounds of it. The thing is, there are three possible faults being the intermediate shaft, steering rack ends, or steering rack mounts. Each of these can produce very similar symptoms, so without seeing it first hand, you can't simply say over the internet which issue you have. It's like trying to diagnose an illness over the phone. Checking the steering rack ends and mounts will be much easier if you can hoist your car up so you can visually inspect everything. The intermediate shaft can be inspected from inside the car, but you will have to loosen a few things to test for play in it. Hey Everyone , im a newb here. own a 2006 zr6 silver with 23000klms. just a bit of background , i currently work for a toyota dealer and have been there for 22 years , qualified tech , done time in spare parts ,service advisor,workshop controller then branch service manager but now just quality controlling whilst the now closed branch gets rebuilt (sometime in the next 2 years ???). the steering shaft spline issue that appears on some vehicles is becoming more prevalent. Mine showed up just as my warranty was ending. Now the shafts are on back order from japan. There is a service bulletin stating the part was a production change and there is a photo showing the difference between the old and revised part. my issue was noticeable at 20000klms. When the vehicle accelerates and brakes with a slight amount of steering input it can be felt , the splines are a slip joint. The rack is mounted to the sub frame and the sub frame is rubber mounted to the body so movement is expected (you probably shouldn't be able to feel it ?) the shaft is the same as 40 series camry and currently there are a few 100 on back order. i have diagnosed 1 camry with this knock (the worst ive seen) and the car has over 300000 klms . so the knock is felt as described and is not normally felt going lock to lock whilst stationary hence a seized or notchy uni joint in the steering shaft like mcu28 kluger or aca33 rav 4. cheers Tim