Location Of Starter relay switch

head lamps work, jumper cable jump starts fail>?y/n?
ah a simple failure, not dead engine complex.
this has only 6 causes, of no crank. using voltmeter makes the job near childs play. if you do that, guessing will be $$$$$$$
A/T trans or M/T auto or stick , not the same.
you shorted out wires under the dash with that key act.
that blows fuse if lucky or blows up very very expensive electronics. nobody here knows what you blew out.
only using meter finds this. a voltmeter (DMM)
all one word left off, I broke off the metal key inside the ignition switch so then hot wired the switch
bingo now I under stand what you did.
a new ignition switch is best.
I think there is no IMMO here
I found a free service manual (real) online
let me see what fuse you blew up.
if you short out the key switch or starter relay
yes the fuse link blows. for sure.
fuse 19 is the starter fuse, not blown.
volt meter check IGN switch has power white wire is power in,if dead, link is blown
turn to ST start, and ST pin goes to 12vdc
as does starter out relay pin B/Y to starter

now the free manual
https://procarmanuals.com/pdf-online-nissan-300zx-1993-service-manual/


now you have full schematics in the EL chapter,.
see 1 below in part.



start path fuse battery must be good.

More then likely the BCM is what is keeping it from cranking . Anti-theft system light lit or flashing when trying to crank the engine ? Try putting gear selector in neutral to see if it cranks then , park neutral safety switch problem . Do you know what a wiring diagram is , need to view to see what all is involved in the cranking circuit .

STARTING SYSTEM PFP:23300 System Description EKS00F9V A/T MODELS Power is supplied at all times ? to starter motor terminal 2 and ? through 40A fusible link (letter. j , located in the fuse and fusible link box) ? to ignition switch terminal B. With the ignition switch in the START position, power is supplied ? from ignition switch terminal ST ? to IPDM E/R terminal 21. With the ignition switch in the ON or START position, power is supplied to IPDM E/R (intelligent power distribution module engine room) CPU. With the selector lever in the P or N position, power is supplied ? through A/T assembly terminal 9 ? to IPDM E/R terminal 48. Ground is supplied at all times ? to IPDM E/R terminals 38 and 59 ? through body grounds E9, E15 (all) and E24 (VQ40DE model). Provided that the IPDM E/R receives a starter relay request ON signal from the BCM over the CAN lines, the IPDM E/R grounds the starter relay and power is supplied ? from terminal 19 of the IPDM E/R ? to terminal 1 of the starter motor. The starter motor plunger closes and provides a closed circuit between the battery and the starter motor. The starter motor is grounded to the cylinder block. With power and ground supplied, the starter motor operates.

Your best bet mite be to have a qualified technician check it . Do you know what C.A.N serial data network is ?

https://www.nicoclub.com/FSM/Frontier/2007_Frontier/sc.pdf

Better check with a test light for power to the small wire that goes to the starter from the key switch. If no power need to check for a neutral safety switch or fuse. Or the starter you got is bad. Alternator will not cause not to crank over

You have power where at the starter ? Heavy positive cable or the control wire at the solenoid ? Is the truck manual or automatic trans ? Free wiring diagrams here http://www.bbbind.com/free-tsb Do you know how to use a wiring diagram for testing electrical circuits ? How to use a DMM - digital multi-meter ? Enter vehicle info. year , make , model an engine size . Under system click on engine ,then under subsystem click on charging system . Starter circuit is the first one under that system. Click the search button then the blue link. A lot involved here that could cause a no crank . Ignition switch ,crank fuse , park neutral safety switch for automatic trans . clutch switch for manual trans . Starter relay ,ign.fuse 40 amp , Heavy gage battery cable to the starter solenoid , an if you have B+ voltage at that cable doesn't mean it can't be bad . Corrosion will cause voltage drop , need to test while trying to crank the engine .
Starter Voltage Drop
Do you know how a relay works ?
VEHICLE RELAYS Operation Diagnosis your starter relay works just like this one in the video .

First thing to check would be the starter solenoid-mounted on the starter. In the starting circuit, that is the most high use/high wear item. A tech would wait for the no start condition, then check the solenoid wire for power when key is held in the cranking position. If power is there, it indicates a faulty solenoid. If no power, trace the signal back to the ignition switch-from solenoid to starter relay to clutch switch to ignition switch.
There are contact points (plates, really) inside the solenoid that become pitted and burned from use, and eventually wear down or out.

The starter solinoid is on the top of starter. Short the two large terminals on it, if the starter turns then the solinoid is faulty. If not then the starter is faulty.

maybe starter relay?

When you go to start the engine you are actually sending power from the ignition switch through a 20 amp fuse [crank fuse] then through the Park/Nuetral safety start switch and finally to the starter relay [located at the center rear of the engine compartment] This relay then sends a more powerful current flow down to the starter solenoid located on top of the the starter which then closes and allows full battery voltage from the large battery cable to energize and spin the starter. I don't think I've ever had to replace a starter relay on these but have replaced a large number of starters with bad solenoids and bad Park/nuetral switches. The "crank" fuse could also be bad but that is also pretty rare.

Fuse would be in the outside fuse box. Look for the one labeled starter. If you are not getting power to the starter, could be an ignition switch.

Does the starter crank the engine over? Saying your truck won't start could mean that the starter spins be the engine won't fire. If the starter is not spinning is it at least clicking?