How to replace a Toyota Avensis (T27) Radio/CD player W53828 with a Toyota navigation unit B9012                                                                                                     First disconnect the vehicle Battery.       There is a 20 pin connector plugged into the back of Radio/CD W53828 with the following pin out:                          1.   Empty 2.   Empty 3.   Yellow 4.   Empty 5.   Empty 6.   Purple 7.   Pink 8.   Light Blue 9.   Empty 10. Empty 1