Ensure the key is out of the ignition and all electrical accessories (radio, lights, climate control) are switched off.
The simplest and safest way to reset a Renault UCH without specialized diagnostic tools is a hard power reset. This forces the microprocessors inside the UCH to drain completely, clearing temporary memory corruptions and software loops. Step-by-Step Instructions: Renault Uch Reset
Press and hold the located on your dashboard or center console for roughly 5 seconds. Ensure the key is out of the ignition