It is located on the left side of the engine on the larger line.
You can bypass the AC low pressure switch, on your Toyota Corolla, by removing the switch. You can remove the wiring to the switch and leave the switch and place.
The 1997 Toyota Avalon air conditioning low pressure switch can be found on the top of the air conditioning compressor. The low pressure switch will be labeled as the low pressure port.
Low tire pressure on the 2011
It is to the left of the steering wheel. It's not a switch but a dial that goes from low to high.
The air conditioner low pressure switch in a 1993 Toyota SR5 is behind the glove box. There are three screws inside the glove box to remove for access.
The 1994 Pontiac Trans Am air conditioning low pressure switch is on top of the air conditioner compressor. The low pressure switch will be labeled as the low pressure port.
Use a flashlight and shine it on the rear left side near the wheel well (of the right front wheel). You will see a cap with an 'L'. (Ref: http://www.2carpros.com/forum/2000-toyota-sienna-where-is-low-pressure-port-to-add-refrig-vt143320.html)
The Toyota Sienna should have high and low marks on the side of the brake fluid reservoir. Check to see that the fluid level is between the two marks.
Of which low pressure switch are you speaking? Engine oil pressure switch? If you're checking that, remove the oil pressure sending unit and temporarily put in an oil pressure gauge. If you're checking the AC low pressure switch, pull the switch from the AC low pressure line, Jumper the switch socket and see if the AC compressor comes on. If it does, you either have low refrigerant pressure or a bad switch. If you KNOW the pressure is up and everything else works, you have a bad switch.
The 1997 Pontiac Sunfire air conditioning low pressure switch can be found on the top of the air conditioning compressor. The low pressure switch will be labeled as the low pressure port.
Low fluid levels in engine.
The picture for the tire pressure sensor is a sort of flat tire. On my 2000 is is right below the fuel gauge and the bottom of the 'flat' tire is \/\/\/\/ and the sides bulge out a bit.