Note. For circuit reference, see DTC P1651 schematic.
Circuit Description
Output Driver Modules (ODM) are used by PCM to turn on current-driven devices needed to control various engine and transaxle functions. Each ODM can control up to 7 outputs, including fan 2 relay, by supplying ground to device PCM is commanding on. ODMs can diagnose each circuit individually. If ODM "B" output 2 (fan 2 relay driver circuit) detects an improper voltage level, P1652 is set.