1. Disconnect a negative wire from the battery.
If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action!
2. Remove a combination of devices (see the Section Removal and installation of a combination of devices).
3. Turn out fixing screws and uncover with assemblies a combination with protective glasses.
4. Turn out fixing screws and remove the measuring instrument needing replacement / a control lamp.