Where is the wiper relay on 1994 nissan sentra 160

Under hood in the IPDM, fuse/relay box

On the 94 sentra the fuel pump relay is located under the hood, driver's side to the left of the battery, third slot from the front of the car, should be green in color.

inside the wiper motor there is a park switch and it might have failed

statement of the supposed fault would be help in getting an answer

My wife and I have owned three 1994 Sentra cars. One of them went through batteries and alternators like crazy. Last time the 1-year old battery died, I replaced it and went straight to an auto electric shop. The technician found the alternator was putting out about 77 amps the entire time the engine was running (factory alternators are rated for 80 amps, but only when charging nearly-dead batteries). He also found that the harness running to the alternator was hot enough to scald you if you touched it. Miraculously, I found a factory NOS harness on eBay and bought it. Easy to put in, and the car went from a maximum charging voltage of about 13.1 volts, to a MCV of up to 14.1! Haven't replaced a battery or alternator on it since. Hope this helps someone...

Yes it does.

delay wiper module under steering column...remove lower dash panel

This is the relay switch and its located inside the dash board. the part itsefl will cost 40.00

If it's like our Saturn, you might have two places to look. We have one under the dash by the dirvers feet and another under the hood.They usally have a cover and when you remove the cover to expose the fuses and relays the insde of the cover will have a dyagram of what each fuse or relay is for, good luck, hope this was some help.

Most likely you will have to replace the wiper linkage from the center pivot to the left or drivers-side wiper pivot. The plastic piece in the linkage gets brittle over time and breaks down. To save a hassle in the future, replace both linkages. It should be under $20.00 for parts.