Need help I have a ls400 1998 I took the stereo, heater,satnav out to sort out the light's for the clock when I put them back in radio works but the heater and satnav buttons don't anyone got any clues? I checked all the fuse's all good as are all the plug's in right no loose wire's

 

So did you disconnect the battery before doing all the electrical work? If you did not, then that is likely your problem. Something could get goofed up. Not disconnecting the battery is about the only thing that can be not done right when removing and installing the radio and climate control unit. Its all simple plug and play.

 

Are you sure?
I have seen some stupid people who removed the navi unit without disconnecting the battery. There are 5 or 6 different fuses supplying the 12V to the unit. The most common fuse to open was the fuse named 15A CRT. Check fuses again both under the dash and the hood using a circuit tester.

 

Yes disconnected the battery rechecked all fuse's radio work's through the satnav screen which works the clock and heater tempjust have line's in them just you press a button and their nothing.

 

This light is always on

 

Yes ? You disconnected before the original working on it? Or just now?

 

You might run the self-test and see what happens. While pressing the climate and audio buttons, turn the light switch to off, tail, off, tail, off. The system will then run through a self-check on the audio and nav systems.

 

Tryed test not doing anything unless I'm doing it wrong

 

Judging from the symptom, the logic circuit seems to be not functioning. This sometimes happens when fuses are not blown while the job is done without disconnecting the battery. It looks like the initial reset circuit is not working or damaged.

If all the fuses are not blown, you need to repair the circuit board inside or simply replace the unit.