What IPDM Means:

IPDM is a Nissan / Infiniti acronym for Intelligent Power Distribution Module.
The IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block which were originally placed in the engine compartment. It controls integrated relays via IPDM E/R control circuit.
The IPDM E/R-integrated control circuit performs ON-OFF operation of relays, CAN communication control, oil pressure switch signal reception, etc., it also controls the operation of each electrical component via BCM and CAN communication lines.