SOLVED: No Reverse/Backup Signal or Lights
 

I no longer have backup lights and my backup camera doesn't show up on the head unit either.

I put a backup camera in over a year ago. It has worked flawlessly and would automatically pop up on the stock BRZ head unit when I went into reverse. About 2 weeks ago this stopped. I figured out my backup lights weren't coming on either. The first thing I did was check the fuse...good. Then I replaced both backup bulbs...still nothing. I pulled the head unit and checked all of the plugs...no issues.

I probed the #2 wire on the 28 pin plug going into the head unit which signals for reverse and it had no signal. See image below provided by www.AutoHarnessHouse.com:
http://www.autoharnesshouse.com/1/pr...w/7549tut8.jpg

Then I found another location for this signal thanks to www.AutoHarnessHouse.com down by the hood release. I probed that and had no signal either.
http://www.autoharnesshouse.com/1/pr.../7549tut13.JPG

Lastly I pulled the fuse again and checked to see that power was getting there, and it is regardless of whether the car is in reverse or not.

Does anyone have any idea whats going on?

Switch at the shifter went for a crap? Would explain why all the back up functions no longer work.

That was my thought as well, do you know where that is accessed? Is it from inside or under the vehicle? If anyone has seen it please share any info you have.

Same thing here, I noticed the reverse indicator in the HUD also doesn't show. Wiggling the shifter gets it pop up which also has the backup lights come back on. What mods do you have that could be related to this? I was thinking it could possibly be my reverse LED's or somehow the MTEC shift springs. I haven't looked into yet since wiggling the shifter is a quick fix and I've been too busy.

I had LED reverse bulbs too which I just replaced with standard bulbs to see if that was the issue. I can't get the signal to show up on the HUD with any sort of wiggling of the shifter but if you can that pretty much tells us there is an issue with the switch/sensor. Maybe the LED bulbs run too much current through the switch causing it to fail or maybe its purely mechanical failure.

It's accessed from under the hood, the switch is part A53 in this diagram

http://images49.fotki.com/v302/photo...ntitled-vi.png

Probably mechanical, because LED bulbs usually consume more than 10 times less energy = less current. I would suspect switch as well.

Thank you @Scenic Driver, the problem is solved...and I have no #@$%ing idea how it happened. I went to look for the A53 switch and look what I found!

https://lh3.googleusercontent.com/-9...522189_HDR.jpg

A frayed ground wire and the reverse wires pulled out of both ends of the connector! I have never even been in this part of the engine bay before. At first I was thinking mouse...but the wires look cut. After cleaning up the crap this is what it looked like.

https://lh3.googleusercontent.com/-j...428604_HDR.jpg

https://lh3.googleusercontent.com/-F...434782_HDR.jpg

I am absolutely blown away. I followed the wires back, which just lay on top of the transmission and I don't see how they could have caught on something to do this.

In the end I just eliminated the plug and soldered new wires between the transmission and the harness and everything is working as normal. WTF?!?!

Wow

wtf...weird.

Mouse with a knife...cause he's classy like that

A Mouseketeer?


http://www.wearysloth.com/Gallery/Ac...520315-694.jpg

I'm still having the same issue, it just popped again as it's been getting warmer. I can still get the "R" to pop up in the HUD if I mess around with the shifter.

I just checked those wires and they look fine. Although the way those wires run along the transmission housing I'm thinking it could have melted the shielding somewhere down the line and is causing a short. I'll have the dealer mess with it when I have time to take it there.

bump. Does anybody know what the red clip controls? I need to replace that part. Mine was pinched during a clutch install and I am having a hard time figuring out what it controls and what it is even called.

You have mice crawling up there to keep warm at night. Bet.


Edit: wow gonna read the timestamps next time

:slap: ......... pay attention .........:D

The bumper knows that someone crushed it ........ the OP had the rodent problem.

EDIT: OK, you're off the hook .......you edited your post ......:clap:



humfrz

This is what I get for being on the forums while I'm at work.

Ya, I know how that goes ....... I get distracted by the baby needing changing (especially with the pooie diapers) or the baby needing a bottle or having to run to the grocery to get more baby food or ........oh yes ma-ma does most of it but I help out.

Multi-tasking is not my strong suit ...... I find single tasking hard enough .....:bonk:


pa-pa humfrz

Neutral switch

https://demos.starbase7.net/t3Portal...C261628E01.png

I think your pic took a neutral switch

@Mr Nerd has been two steps behind and one to the side on this thread ..... :D


humfrz

The pic doesn't work for me


Is it because I'm white?

Haha... maybe. It doesn't work for me from my work connection either. That's weird.

Click the readme on my sig. Repair manual > Drivetrain > tl70 manual transmission > Neutral position switch

Edit: oh! Now it loaded because I navigated to the page. Meh. ok.

So the OP's car is actually my car.

He ended up hardwiring the wires straight across which wasn't great imo. I ended up replacing the reverse sensor (black plug) and finding the right pigtail for the other side (same as 240sx speed sensor plug that you can buy from Wiring Specialities) and wiring it all in like OEM.

I was losing the R indicator and backup cam with the old reverse switch. Thought it was the wiring but turns out it was the sensor itself.

........:rolleyes:



humfrz

I have the same problem, but those rats ate mine wires. I'm getting my engine fix from the dealership because of the recall. While the technician was fixing, he came across these wires chewed. He told me that it's the neutral and backup switch. So if the black clip is the backup switch, then I suspect that the red clip is the neutral switch.

I have this same issue, however, the problem for me, is that the end on my reverse light switch has been rubbed down. When the reverse gear is engaged, it's not sinking the switch down enough to trigger the reverse light/camera.

So I need a new switch overall. Does anyone know where I can order one of these?https://uploads.tapatalk-cdn.com/201...835c744af9.jpghttps://uploads.tapatalk-cdn.com/201...79eb5cd19c.jpg

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Are you not able to order parts through a dealer there?

Well I tried one dealer but they referred me to their special parts order department which im waiting to hear from.

Other Businesses are closed today until Monday. So I wanted to try and see if there were stores online that had them in the interim. Oh I'm in Jamaica by the way :D.

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Yeah. That's why I asked. I see only a couple Toyota dealers. I'd just reinstall the old one while waiting for the replacement to arrive. Just be really careful about backing up. :D

https://parts.toyota.com/p/Scion_201...U00300821.html

What I did, or my mechanic rather, as a quick fix was to install an additional washer to the switch which enables it to be sunk fully when the Reverse Gear touches the Switch. We did that quick fix today and it works now but I still need a new switch to permanently get it fixed again. I will check out this link that you provided though. It seems to be it.

Thank you very much for the assistance though!

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What's the location of this switch? I think I have the same issue.

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https://demos.starbase7.net/t3Portal...modelyear=2016

https://demos.starbase7.net/t3Portal...modelyear=2016

Thanks

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Just went under the car. Looks like a bitch to get to. How did you guys do it?

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I did it from up above, just reaching back.

It's not super fun.

Yeah I can tell

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No way I can get my arm in there lol.

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Would an extra washer make the button further away? I would assume he grid down the shoulder of the sensor? I am having a similar problem i think. My indicator shows fine but my lights only show if I wiggle the shifter.

I wondered about that too. Didn't want to make it a thing. It might be like the door switches where the circuit is closed upon release. Then adding the washer makes sense. We can check the wiring/circuit diagrams to verify. Look for the manuals in my sig line. I'll study them after work today. The disagreement between reverse indication, and lights would make sense if the indicator latches electronically between reverse and neutral. Then, even a momentary reverse signal would not be cancelled until switching back to neutral.