7. Detect Malfunctioning Part

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Check the following.

Harness connectors M135, F105
Fuse block (J/B) No. 1 connector M1
Harness for open or short between ignition switch and fuse block (J/B) No. 1
Harness for open or short between ECM and fuse block (J/B) No. 1
: Repair open circuit or short to ground or short to power in harness or connectors.