Looking for Nasriza

Have a problem wit 06 vn with ISX and DM3 autoshift. No speedo, so it won't shift correctly. Insite shows no codes. Service Ranger shows "no road speed" fault under cruise control heading. Customer already replaced both of the transmission harness, vss sensor. Where should I be looking first? Everything else on data link working (abs, gauges besides speedo and auto trans. besides no auto shift) What are the wire # for vss coming out of trans. ecu going to vecu, or is it broadcast through data link to vecu then to engine ecu? Thanks in advance.

 

Thanks Buddy! Found problem. J1939 signal corrupted inside shifter control module. Good signal going in,erratic coming out so Volvo vecu could not read road speed signal, thus no speedometer and improper shifting. #%&* me up because shift control seemed to be working fine. Thank God for volt/ohm meter.