Check with the Huawei service department (or wherever you got the Pioneer) to see if Pioneer has an update.
Bluetooth specifies how data gets from point A to point B - but it doesn't (yet) specify the format of the data in all cases, so sometimes there's a mismatch. One day the industry will fix that. (They fixed the MMS problem - in 2004 you couldn't send an MMS from a phone on one carrier to a phone on a different carrier - different data formats again.)