Where is the backup light switch located....exactly

Standard Motor Products NS58 Neutral Backup Switch
This is what it looks like, it should be located where the shift cable attaches at the transmission

ESTEEM 97
so are the backup lamps out, both ?
that it?
that means the transmission PRNDL switch is failing for the R contacts.
but what transmission, is there, the A/T above, or an MT.
auto or stick ,we cant guess transmission here
you can tell us, or show a photo of the shifter, , that works.
regardless its on the trans box. this switch, but where, it is exactly
you need to tell what is there. first.

Back up light switch is located in the shifter area. remove cover ,you will see the switch where the shifter hits the switch to cause the lights to work.

Theres only 2 locations it could be. On the linkage arm on the driver side of the transmission, or its a pressure switch at the tail of the trans.

This switch is built into the transmission range sensor/ neutral safety switch. It is located on the transmission under the shift cable arm.

I didn't find a location for the backup light switch,

But found the following on Autozone.com:

Backup Light Switch Operation:
An open switch that prevents voltage from being applied to the backup lights until the vehicle is put in reverse. Putting the vehicle in reverse closes the contact and applies power to the rear back-up lights. Check under the dash or somewhere near the steering column if you have a column shifter. If the shifter closes or opens the backup light switch mechanically, one should be able to trace the cable and mechanisms that turn a cam that connects to the backup light switch, somehow. May have to disassemble the steering column area to see it.

Backup light / Reverse Lights are located in the transmission case. It is not too hard to change, once you locate the switch can be done easily. I have enclosed pictues for your understanding

most likely it the backup light switch, probably located on the trans housing.dont know exactly where on that model.

it screws into the trans

I had the same problem. My backup lights wouldn't come on in when I put the auto. trans. shifter into the Reverse position. They WOULD come on briefly as I moved the shifter from Park position into Reverse, but would go off again when the shifter reached the Reverse detent. I got the solution from the Haynes service manual, in which the relevant switch is referred to as something like the neutral safety switch. Check on top of the steering column close to the firewall. Set the parking brake, then move the auto. trans. shifter into Neutral position. Get under the dash and rotate the neutral safety switch clockwise as far as it will go. Then move the shifter into the Park position, and your switch should be set. If the backup lights don't come on now when the shifter is put into Reverse position with the ignition switch 'on', there may be another problem.