Description & Operation

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Power is supplied at all times:

Through 50-amp fusible link (Letter "G", located in fuse, fusible link and relay box).
To ignition switch terminal No. 1.

With ignition switch in START position, power is supplied:

From ignition switch terminal No. 4.
To Park/Neutral Position relay terminal No. 7.

Ground is supplied with selector lever in "P" or "N" position:

To TCM terminal No. 48 through Park/Neutral Position relay terminals No. 1 and 2.
From body grounds E24 and E42.

Then Park/Neutral Position switch is energized and power is supplied:

From Park/Neutral Position relay terminal No. 6.
To starter motor harness connector terminal No. 1.

Starter motor plunger closes and provides a closed circuit between the battery and starter motor. Starter motor is grounded to engine block. With power and ground supplied, cranking occurs and engine starts.