Renault Car Radio Unlock Code Generator

renault.js

/*
Generate Unlock Code for Clio, Duster, Espace, Kangoo, Laguna, Logan, Master, Megane, Safrane, Scenic, Symbol, Trafic, Twingo
Using the PRE code (1 letter, 3 numbers) which can either be found 
- by turning on the radio and simultaneously press the buttons “1” and “6” for about five seconds
- by extracting the radio from it slot and looking bellow the barcode sticker
*/

function renault(a, b, c, d) { // 'A', 1, 0, 0
  left = (a.charCodeAt(0) - 65) * 10 + b;
  right = ((left + c * 10 + d) * 7) % 100;
  return String((259 % Math.abs(left)) % 100).padStart(2, 0) + (right % 10) + (right / 10 | 0);
}