Power Supply And Ground

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Power is supplied at all times

through 20A fuse (No. 31, located in fuse and fusible link box)
to audio unit terminal 19 and
through 15A fuses (No. 34, and 41, located in the IPDM E/R)
to CPU of the IPDM E/R.

When the ignition switch is in ACC or ON position, power is supplied

through 10A fuse [No. 6, located in fuse block (J/B)]
to audio unit terminal 7
to unified meter and A/C amp. terminal 35 and
to BCM terminal 11.

When the ignition switch is in ON or START position, power is supplied

to ignition relay located in the IPDM E/R, and
through 10A fuse [No. 12, located in fuse block (J/B)]
to unified meter and A/C amp. terminal 22.

Ground is supplied

to unified meter and A/C amp. terminals 29 and 30
through body grounds M57, M61 and M79 and
to IPDM E/R terminals 38 and 60
through body grounds E15 and E24.