BSM and Backup Sensors

Hey all. I just installed a Rago rear bumper on my 22 Tacoma. After hooking the harnesses back up I don't seem to be getting any response from either my BSM or backup sensors. When installing I did break one sensor from one of the bumper ends and then replaced it with one of the sensors from the middle. Then I ordered new sensors from Extreme Terrain and used those for both of the more inner sensors - replacing the second inner sensor as well. I did make sure the harness connections were tightly pressed back together and felt them click into place. I checked the setting for the backup sensors and it is set for the further distance with the medium tone. Oddly, I couldn't find the BSM setting when looking - though my truck does have them. Any common issues or something I'm overlooking that might be causing this? Also, can someone tell me which sensors at the BSM and which are the backup sensors? I assume they all use the same sensor as I really couldn't tell any difference.

Thanks!

 

BSM sensors are large squares mounted at an angle at each corner of the bumper. Parking sensors are the four smaller units with circlular trim rings.
I had read here that the parking sensors don’t like to have their locations swapped around, so I was very careful to put each one back in the same location on my new bumper.
I know BSM doesn’t have any user adjustable settings, just the on/off switch.
Sorry I can’t offer any more help

 

Alright, I feel somewhat stupid. I wasn’t looking in the right place for the BSM on-off button and it was off. Turned it on and I am getting readings. However, now it seems to be way too sensitive and especially the passenger side fairly consistently flashing when I’m driving down the road without an traffic. On the new bumper the sensor faces are exposed so maybe without it being behind the end caps it is more sensitive? Do I need to recalibrate the sensors for the new positioning? Or possibly adjust them somehow?

Backup sensors still not sounding off but I can live without them and just use my backup cam.

Thanks!

 

BSM units are very sensitive to angles. I’d wager the rago has them angled outward more than stock. The pics on their site look that way to me.
There is a calibration process that requires a techstream and a special pyramid shaped reflector of some kind. I’ve read a thread on here about someone DIYing it, so it’s possible, but he had a stock bumper. Don’t know if calibration could overcome a significant change in mounting angle (if that is the issue)

There’s an on/off button for the parking sensors as well

 

Hmm, there is probably some adjustability in the angle depending on how much I tighten the bolts. The sensors sit on three posts that I think kind of flex down a little the more I tighten them. Might try messing with it a bit - otherwise maybe take it into the shop to see if they can calibrate it.

I feel really dumb not noticing the parking sensor button. I thought my parking sensors were working at one point and I don’t remember ever turning it off. So I figured that was a button if I want to turn the rear camera on when I’m not in reverse. Haven’t tested it yet but I bet they will work fine now.

Thanks again for all the help!

 

Agreeing about the parking sensors do not like being transferred. I broke one and replaced all four during bumper change.

 

Were you able to get them going again pretty easily after changing them out or was there some hassle involved? I snapped two of the trim rings swapping mine so I bought cheap replacements on Amazon and just used their trim rings on the OEM sensors

Don’t feel dumb! Only reason I know anything is from spending too much time here and reading others experiences for years!
I don’t feel like I did much but happy to be helpful. Hope you can get it working! The BSM logo in the mirrors doesn’t do much for me, but that rear cross traffic alert in parking lots is amazing when you’re nosed into a tight parking spot and can’t see traffic behind you

 

I just used the cheap replacements. One of mine oem pushed in on itself and then separated. I tried to replace just the one, it didn’t work so I just did all four and it was fine.

 

I have replaced just one that I damaged. All was OK and has been for years.

More likely scenario in your case is you damaged more than one sensor and didn't see the damage. The wires on the back are very fragile, and reassembly of the three parts is a pain.

 

Here’s the calibration procedure for the BSM.

 

I thank you for that attachment. The OP solved his problem by turning the BSM switch on in post #3.

 

Well, I got the sensors turned on, but I think they need to be re-calibrated. Took at look at the attachment and I'll probably just bring it to the dealership and have them do it. I don't have the Techstream and other required tools and it looks kind of complicated. Thanks for the upload though - it was interesting to read over.

 

Calibration of the BSM would not surprise me. What say the manufacturer of the bumper.

 

The manufacturer only says it retains the OEM blind-spot monitoring system. I don't recall reading anything about requiring recalibration.

 

If you can get them on the horn I’d ask if they have had BSM complaints.
Like I said the angles look wrong to me from the pictures compared to what I remember of the OEM angles and my aftermarket bumper, but it’s hard to say without seeing it in person

 

I don’t really have any pics of my BSM that are similar to the listing but will share what I do have uploaded already


Not the greatest pictures of the sensors, but I feel like you can sort of see what I’m talking about. Mine are angled more towards the rear I feel like, and they still pick up guard rails and bushes occasionally

 

I concur, at least from what I can determine from the Rago website pictures and installation instructions. The proper measurement is 40 degrees from the rear or 50 degrees from the side. Five degrees off from a 45-degree angle, with it angled more towards the rear.

The last page of the Toyota instructions linked above in post #10 shows a misleading diagram unless you draw out what they show. Perhaps the bumper manufacturer followed that diagram. Looks to me like they might have. I will attach a few pictures of a diagram I drew from page 8 of the instructions showing quite a different angle.

The first picture is of two different stud lengths (25MM and 50MM) I did this to prove to myself the stud lengths made no difference to the angles calculated/drawn. Page 8 of the instructions say nothing about stud length, yet they are referenced. Drawn out shows quite a different angle than the Toyota BSM Alignment procedure.

OP, I am not doing this just for you, but for myself as well, one day I will be fabricating my own bumper and need to know all these angles. This type of inquiry helps me learn.


The second picture shows the 50 degrees from the side measurement.

DONE.

 

Yeah. I knew that one was busted, the other ones seemed fine but … apparently not. So I tried to figure out some clever way to figure out which ones were dead but then I was like shit, just step into reality, do all and be done.