Circuit Operation

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

A/T control relay (terminal 1) receives battery positive voltage through a dedicated 20 amp fuse.
The PCM (terminal 50) applies voltage to energize the A/T control relay (terminal 2). With the A/T control relay energized, system voltage is applied to the PCM (terminals 77 and 89).