Check Auto-Cruise Control-Ecu Terminals
WARNING: This page is about a different car, the 2004 Mitsubishi Eclipse. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
*: Auto-cruise control-ECU terminal No. 10 is sending a voltage of 5 volts to the vehicle speed sensor system circuit. However, as higher voltage is mixed through the circuit a voltmeter will show 8 -12 V.