1. Switch off the ignition.

2. Remove the "BACKUP"-Fuse (7,5 Amp) for 10 Secounds out of the Fusebox located next to the batterie under the hood, and intsall it again.

ATTENTION: When you remove the "BACKUP"-Fuse the clock and the Radio-Codes will be lost. Write down the Radio-Codes bevor you remove the fuse.