One thing that had never worked on my truck has been the rear parking sensors. The truck is not equipped with front parking sensors. The parking aid button on the dash would blink at me every time I started the truck, and never heard a noise from it. I scanned the truck for codes an this is what it said:

B1B52-96 (2F) Rear sounder - Component failure - internal failure

So, I purchased a rear sounder and swapped it out.

FYI - The rear sounder that was bad had no circuit, where the new sounder did show resistance with a multimeter. I'll be disecting the old sounder at some point for the sake of science, however with the part being as cheap as it is, it's probably not worth taking out to 'repair' - getting to it was more of a pain in the @ss for me than paying for it.

Anyway -- I've swapped it out, and tada! It now made noise! ... aaand it's a SOLID tone, as though I'm against the wall. Knowing that I didn't want to have to hear this every time I'm in reverse, I edited the Car Configuration File using the IID tool and told the truck it was not there.... which seemed to work, for one minute. Now it's still making the tone in reverse.

After a bit of searching, I see people mentioning there is a 'recalibration' that can be done to the parking aid system? Anyone know anything about this?

Dave

 

I'd be interested to hear if there is actually is a calibration. I've never heard of one myself. Since you have an IID tool, have you looked at the live values of the sensors to see which one is actually sounding? It might just be a defective sensor that needs to be replaced. The IID tool will show you the distance to an object that each one is currently seeing.

 

No calibration, there should be a way to do it though, there is not.

 

I'll check the live values, great idea! I have a spare to swap.

Dave

 

I was in particular looking for a way to calibrate or do something with the two center sensors. If you could "calibrate it" or take a base reading and tell it what is normal, then save it, it would solve my problem, or a software patch to do it. I don't think it was written that way.

 

I got some live values over the weekend. All sensors show 2.5 until I put the truck into reverse -- instantly, the two center sensors read 0 -- I assume this means it thinks there's something directly against it.

I have a spare to swap into one of them to try. I'll be taking the bumper apart soon to make a rear tire carrier so I'll wait until then to do it, unless someone has a sweet trick to pull them out without removing the whole shell.

On the passenger side center sensor the bracket around it is broken, someone clearly hit something with it. The drivers side center sensor has a scratch on its surface. I wonder if such light marks may be the reason they're sensing something directly against them? I keep forgetting to take a couple of closeup pictures.

Maybe I should just hit them with a very fine sandpaper and see if I can resolve it before even swapping them? Thoughts?

Dave

 

the bumper is not difficult to remove. i suspect you will find something when you remove it.
look for a broken connector, sensor, or a broken/shorted wire in the pdc bumper harness.
if you can't find any physical damage, you can swap the 2 inner sensors with the 2 outers and see if the fault follows the sensor.