This is the top side of a Phase 1 (till 1996) voice synthesizer used in the Renault Safrane.

If you are interested in technical details about all the chips and versions, please have a look at my initial research >HERE< .

The part with the highest probability for us to understand its inner workings and have some interesting results is the voice ROM (top right corner [NEC part]). Because my version is speaking german, i would make an educated guess that the ROM contains at least german words. 

Phase 1 boxes were available in 5 languages. And all languages have own Partnumbers. That tells us that Phase 1 will probably contain just one language. (Unlike Phase 2 where there is only one Partnumber for all Languages, and the option to change the language with dealer tools).

My research for the ROM pointed me in the direction of a MC27C4001 compatible device. It can store 4 megabits wich are 512 kilobytes. Depending on the used Samplerate (and maybe compression) you can fit quite a lot of speech inside this chip. There are "just" around 30 messages available to be played, but most of them use the same samples. Either the samplerate for the speech is very high to fill the whole 512kb chip with those few words or it is half empty...

Lets see if we can read it with my TL866II PLUS...