I'm not sure if there is a dedicated fuse for that, it's probably connected to the rear brake lights I'd assume. Most likely you need to clean the switch in the shifter.

 

18. TAIL 15 A: Tail lights, license plate
lights, instrument panel lights, instrument cluster lights

23. STOP 15 A: Stop lights, high mounted
stoplight, anti−lock brake system, shift
lock control system, multiport fuel injection system/sequential multiport fuel
injection system, cruise control system

both of the above are below the steering wheel fuse panel

Maybe its connected to one of those and the manual they just made a mistake and didn't write "reverse lights" for one of them.

Ok thank you much, I will be moving on to taking apart the shifting cover. ty ty

 

Check the backup switch on the transmission.

I found this out the hard way.

I had a set of LED back up lights but one side keppt going dark. I ended up blowing the fuse when I reversed the polarity by accident.

I replaced the fuse and the bulbs to LL bulbs. It worked for a while and then went dark again. Inspected the filaments in the bulb and it was good.

 

Check the backup switch on the transmission.

I found this out the hard way.

I had a set of LED back up lights but one side keppt going dark. I ended up blowing the fuse when I reversed the polarity by accident.

I replaced the fuse and the bulbs to LL bulbs. It worked for a while and then went dark again. Inspected the filaments in the bulb and it was good.

I thought the backsup switch was only located on the manul trans cars not the automatic.

I am searching now for a guide or something about the shifter switch that I can reference if anyone might know of a guide or something that would be super awesome.

 

Here's what I can tell you. Op, if you need the drawing, pm me.

From the 10a gauge fuse, power goes to A2 backup light switch. It's located past J4 junction connector. This is on the passenger side kick panel. Above the connectors for the ECU. The wire is red with white tracer and is the same color coming from the 10a gauge fuse.

From the bu switch, the wire color is red with black tracer going to the J10 connector.

Goes to J10 connector whick is on the driver side rear. It's in the trunk behind the cover.

Behind this is each back up light.

My bad. I thought it's location was on the transmission. It's in the passenger side kick panel instead.

 

This fuse under the steering wheel area.

33. GAUGE 10 A: Gauges and meters, air
conditioning system, daytime running
light system, charging system, auto
anti−glare inside rear view mirror, power windows, cruise control system, rear
window defogger, back−up lights, front
passenger’s seat belt reminder light

thank you so much for the help @75aces I'm going to take alook again tomorrow when it's light out, much appreciated!

To be clear is the A2 switch (which is the switch I am looking for?) is located behind the glove box near the J4 junction?

 

thank you so much for the help and the diagram.

Is this the blue housing you are referring to? (see image)

Just to be clear, I am trying to access this so I can test if the switch is good or bad right?

 

One way to test it, put the car in reverse and put your finger on the housing. See if it clicks when it goes into reverse.

 

I will try that tomorrow, I have learned so much from you and everybody here so ty ty!

my plan tomorrow,

1. Do the diagnoses of the switch behind the glovebox in the blue casing
if that is ok, or not ok
2. remove auto gear shifter cover, and inspect to look for the sensor that detects when it is placed in reverse, and clean it make sure it has good contact points
if that is ok
3. trace the wires from the fusebox to the reverse lights and make sure nothing is disconnected or has a torn wire.


edit: Forgot I had the whole wire diagram (I'm an idiot) so now I see EXACTLY what you are talking about, damn this is cool! image uploaded

But just conceptually thinking, I see there is an A2 switch and a B2 switch which are in parallel but I can only think of 1 manual switch (on the automatic shifter) that puts the car into a reverse state. So all of this wiring has to go through the shifter area doesn't it?

so why are there 2 switches, maybe the second one is just something like emergency flashers button that triggers reverse lights or something?

editing: adding 2nd image which shows info about the diagram

 

Sorry Phaze, if I am confusing you. The blue relay is something else. If you compare the drawing and use that as a reference, it should be located towards the driver's side.

Before testing anything, we need to be sure we are testing the correct relay and associated wiring.

Refer to my post #8.

 

I'm lost now, your post 8 says J4 junction box is behind the glovebox which makes total sense because the 2006 wiring diagram (EM00H0U which I think is automatic because it speaks of electronic transmission parts) says it is exactly where you say it is. See image.

So is this wiring diagram is different than what is in my 2008 corolla maybe?

 

These are the correct ones. The ones I posted earlier was for something completely different. Sorry.

 

Phaze, I am stopping you because I don't know which relay you are going to probe. IIRC, the blue relay is the heater relay, not the one you are looking for.

There should be 3 or 4 relays there, but don't want you probing the wrong relay and having to repair the wires that you pierced.

Just slowing you down a bit. That is all.

 

ok I completely understand. but can we settle on the diagrams in my last few posts are 100% correct to my 2008 corolla, and the wire goes from the inside fusebox fuse 33 to the passenger side j4 junction, then back to the drivers side engine compartment where the 2 switches A2, and B1 are located?

Which logically makes zero sense geometrically.

Then runs down drivers side to the j10 junction in the trunk drivers side.

If the above is incorrect then the diagrams I need to delete off my computer and try and find the correct diagrams.

 

I will pm you Phaze and get you the pages you need.

In the meantime, we will start fresh with regards to the images we have posted to this point.

 

haha ok sounds good, start fresh! ty ty ty!

for the record, the wiring diagrams I have for 2004 and 2006 are identical. I had thought 2003-2008 were identical in terms of the diagrams, but hey this is coming from someone who had to look up what RH and LH acronyms were, just 2 weeks ago.

 

you are the best, I will diagnose and test both switches first thing.

If they are not good then I will check the shifter inside the car and clean the sensor at the R location (read that some people did that and it fixed it).

If the 2 switches are good then I'm going to wire trace all the way from switches to the tail j10 junction, then to the tail lights.

When I say "good" I mean the pins are closed when activated into reverse.

If can't find any faulty wire then I will start by replacing the a2 switch

 

Look on eBay for a set of FSMs.

 

Here is what I have for the service manual pertaining to the back up lights.

I think info I read about a sensor in the shifter is completely wrong. It is literally all handled by that A2 park/neutral position switch and exactly what the service manual tells me. I think the shifter manually moves the A2 switch to its various positions P,N,R that is why the shifter is not in the wiring diagram.

And you Mr. Aces are the man! the shorting of the pins makes complete sense with the images I am uploading, the service manual says "ball" but that makes sense the switch uses a ball as contact points.

so now I'm literally just going to do what the images tell me to do, can't wait to try this on Tuesday and I hope it does not rain!

video of a guy dealing with this exact switch in his corolla

 

Nice work.

The switch is stuck. Just like how mine failed.

On mine, I have a beep to go on when I am in reverse. The lights did not illuminate. The switch was not triggering the lights.

 

ok so I got out there today, found my switch, and took off the clip.

I'm not exactly sure which pins refer to which positions on the shifter. I'm going to try and find this information somewhere.

I see one large pin in the row closest to the front bumper, then a piece of plastic, then another pin, then plastic, then 2 more pins, all on the same row.

The second row , closest to trunk, has 5 pins in total, 2, 1, 2

Not much room to really see to be able to grab a specific pin to throw an aligator clip or something on it

Maybe just replace it?

84540-48010 - Toyota Parts Deal

www.toyotapartsdeal.com

Well first I can run a continuity test from the a2 clip back to the tail reverse light, red black wire entire way.

 

I would just replace the switch.

Your switch is stuck open since the circuit can't be bridged to turn on the backup lights.

I had the same issue with my backup switch. Couldn't figure it out, so I just bought the part and it worked again.

You can tell the switch is stuck when you remove it. It will not let you push on the end of the ball.

 

Bought the OEM part a few hours ago after I posted, I will install it and post back the results.

I have to keep thanking you, I'm sorry, but I have learned so much during this process because of you, wiring diagram reading and everything!

 

Glad to be a contributor.

I too have learned quite a bit these past few years from this forum.

Just my issue alone, it was a challenge. But with the help of this forum and my limited knowledge of reading electrical drawings, and troubleshooting, the issue was resolved.

I am always learning and thankful of other members to guide the murky waters.

 

I'm going to replace it when it comes.

For now I'm trying to figure out where the wiring diagram is for the "A2 Park/Neutral Position SW " (the exact words the manual uses to name the switch) switch and I just can't seem to find it.

 

The actual pin out is not shown. It is on the ewd for the tail light.

Look at the connector and the PIN numbers should be marked on the back of the connector.

 

so look at the back of this grey plug for numbers or letters that correspond to the pin locations?

Are the male pins also somehow numbered so I could figure it out?

I think I can see numbers on it now, of course tomorrow I can clean it and see closer, I'm just not sure how that can tell me for example, which pin is ground. If I can figure that out I think I can do some testing.

in the 2006 ewd manual , the term Park/Neutral Position SW shows up on 5 different items.

I'm pretty sure baby blue is Drive, image below is the cruse control ewd

 

The other place to check is the front of the connector too. Around each pin or in between.

 

Okay so two things.

1, I can now remove and install the neutral safety switch with my eyes closed.

2. it works! I bought one off eBay and I at first didn't think it was working because I didn't tighten all the bolts but then after I finally tightened all the bolts the backup lights come on.

I am so excited thank you 75aces so much!


Also what happened to all the wiring diagrams that I had uploaded, I was trying to look at previous posts to reference them but I cannot find them.