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If you are looking at the engine and transmission from the radiator side, look down at the transmission about half way towards the center near the bottom, but still within view from the top side. There are two switches located next to each other. The one located closest closest to the driver's side of the car is the reverse switch.
The back up light switch is built into the multi-function switch. It is located on the front of the trans axle. The shift cable is connected directly to it. There is no 'seperate' reverse switch for the back-up lights.
Check your transmission fluid level asap. if the level is good, you will need to inspect the shift solenoids located inside the transmission pan. replace any solenoids that are proven to be faulty. i would also advise to test the pcm/tcm for its operational value as well. this device controls the shifting patterns of the auto trans.
while checking the solenoids, if you notice any metal fragments on the bottom of the pan, this will be a sign of major gear friction. you should re build in this case.
P1780 Park/Neutral Position Switch Malfunction (Only For A/T)
This code is related to a malfunction with the park neutral position switch, it's located on the transmission.
It maybe easier to get a Chilton manual from the autoparts store to locate the sensor/switch. The book runs about $20.
Replacing the switch/sensor may resolve the reverse light problem also.
the only thing i can find other than the dealer is getting a universal dip from a local auto parts store and cutting it to size with isnt really to hard or go to a wrecking yard and find a 4 cyl dipstick from a camry that i close to the same year as yours with the same motor.
it is very difficult to match wiring harness from auto tranny to manual tanny they are different connectors and reverse lights on auto tranny was connected to the nuetral safety switch about 6 to 8 different wires on manual tranny there is a switch located on the top of the tranny and backup lights are connected only with 1 wire you may need to get some help from auto electrition this should not cost alot of money to fix thanks
contact your local parts retailer for the right auto oil. as for not going int gears you may have to adjust the the inhibitor switch on the auto if the switch is not in the right spot you wont get the gear you want. for more info on the procedure let me no and ill see if i can sort it out for you it may be easier to contact a dealer and get them to photo copy the procedure out of the work shop manual