I have a GS300 and I had to use a different phone to get it to work.

The following is direct from Sony

How to pair phone with Lexus Bluetooth car kit (P800/P900 series)


How to pair phone with Lexus Bluetooth car kit (P800/P900 series)


Sony Ericsson P800/P900 series use the Bluetooth profile "headset" and does not support the Bluetooth profile "handsfree", which Lexus mainly uses.

To check which profile Lexus uses:
If the last dialed number and caller ID is transferred to the Lexus Bluetooth car kit, then Lexus is using the Bluetooth profile "handsfree".

This solution is valid for the following product and environment:


P800


P802


P908


P900


Lexus LS430


This solution also answers the following questions:


Cannot bond with built-in Bluetooth car set


How to connect with Bluetooth car set Lexus 430 model 2004


How to pair phone with Lexus Bluetooth car kit