Trailer Power Supply Operation

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

The trailer power supply (trailer tow 7 pin connector only) is controlled by trailer tow relay 2. When the ignition switch is in the ON or START position, power is supplied

through 10A fuse (No. 38, located in the IPDM E/R)
through IPDM E/R terminal 27
to trailer tow relay 2 terminal 1.

When energized, trailer tow relay 2 power is supplied

through trailer tow relay 2 terminals 5 and 7
to trailer connector terminal 4.