System Description (A/T Models)

System Diagram

Courtesy of NISSAN NORTH AMERICA, INC.

Component	Function
Electric shift control module	Electric shift control module supplies power to starter relay and starter control relay when the shift position is P or N position.
BCM	BCM controls starter relay.
IPDM E/R	CPU inside IPDM E/R controls starter control relay.
Starter motor	Refer to Starter motor .

System Description

When shift position is "P" or "N", power is supplied to starter relay and starter control relay by electric shift control module. And BCM and IPDM E/R (CPU) detect selector lever P/N condition by the inputted signal.
When starter operating condition is satisfied, IPDM E/R turns starter control relay ON by starter control relay control signal.
When engine cranking condition is satisfied, BCM turns starter relay ON by starter relay control signal.
Then battery power is supplied to starter motor ("S" terminal) through starter control relay and starter relay. And IPDM E/R (CPU) detect starter relay condition by the inputted signal.