I've just got myself a 2008 407. It has fitted the RD4 Audio System. All very nice. The manual implies I can use the RD4/Car itself as a bluetooth handsfree unit for a mobile phone. I've entered the RD4 mobile phone pairing menu. It shows no devices are already paired. Using my Sony W810 phone, it picks up the RD4 as a Bluetooth device, ID '407'. However when I attempt to pair them, the Sony asks for the passcode. Page 177 of the Peugeot manual says it's 1234. The Sony doesn't accept that. The RD4 display indicates a device is trying to pair, but that too says it's rejected. I've tried all the obvious codes, 0000, 9999, 5678, etc, but no luck. How do you set the RD4 back to its default, and is it indeed 1234 ? Or, have I got the wrong end of stick completely here ?