DTC P1703: Transmission Control Module (ROM): Description
WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
The TCM consists of a microcomputer and connectors for signal input and output and for power supply. The TCM controls the A/T.