Wher to locate a neutral safety swich on a toyota corolla automatic 1991model.

If the other brake lights work, probably broken wire. Eye level meaning Suv hatch? If so, the wires tend to break at the rubber boot from the hatch to the body. The reverse lights run threw the neutral safety switch on the transmission. Could be a broken wire, most times it is the switch.

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Sounds like a cable to the transmission is not adjusted up right, and/or the neutral safety switch is not adjusted right, if this applies to your Toyota Corolla.

It is part of the neutral safety switch.

If you've checked both light bulbs and they are good, then you are looking for the neutral safety switch. It's connected to the shift lever mechanism somewhere (sorry, I can't say where because I've never looked inside one of these vehicles, much less worked on one).

On automatic transmission models, the neutral safety switch is supposed to keep the starter from running unless in Park or Neutral, as well as turn on the reverse lights in Reverse.

I'm not sure for your car but the swich for the reverse on most cars is usualy on the gear box.

1. I tried to find a
   Toyota Corolla Wiring Diagram 1998 |
   If you go to your library you can look for free. Just not sure of location of of neutral safety switch for your year of car. In the back of motor manual is wire diagrams you will find switch there. Also GEO Prism is the same car.
   
2. The last time I worked on a Prism it was a 1997 I found a bad wire connection at the shifter. Took 20 minutes to do repair and no parts.
   
3. So I would check the switch in your console. Sometime they stick or a wire comes loose. Sometimes a little WD-40 shot to the switch helps.
   

check the switch on the break pedal,replace as necessary.

I would go to local auto parts store and ask them the location by checking on there computer , For example autozone.

check the oil level and refill if need ,type DII oil for automatic transm