you dont...
Chiltons owner manual has complete eccm trouble codes
Underneath the passenger seat.
under passenger seat
no just one.
its connected to your positive battery cable.
The estimated cost to replace a clutch and radiator, in a 1989 Nissan pickup truck is $1100. A private mechanic may be able to do the job for less.
install a new one!!
Check the radio/Acc fuse...
Check your fuses.
The safety neutral switch on a 1989 Nissan Pickup with an automatic transmission and a D-24 engine is located on the transaxle. The neutral switch will be found where the linkage attaches to the transaxle unit.
6.5" front doors, 6" x 9" rear side sorry those sizes are for the 1989 pathfider...
If you Google "1999 Nissan U Joint" you'll see many hits. Specifically, J.C. Whitney carries them. Have a look!