installation bumper R-DESIGN problem with parking sensors

[set]

Hello everyone!

I installed new bumpers on my Volvo XC90 2019y (inscription)  fron R-Design car 2020y
But the parking sensors don't work. 

I tried to replace the PAM. My number PAM 32243137, new 32281512
but, it didn't work

I was told that I need to replace the parking sensors because they were not the same in 2019 and 2020

Maybe someone knows how to fix this without replacing the parking sensors ?

[Marcp]

Hello everyone!

I installed new bumpers on my Volvo XC90 2019y (inscription)  fron R-Design car 2020y
But the parking sensors don't work. 

I tried to replace the PAM. My number PAM 32243137, new 32281512
but, it didn't work

I was told that I need to replace the parking sensors because they were not the same in 2019 and 2020

Maybe someone knows how to fix this without replacing the parking sensors ?

[paunionutz]

You replaced WAM, not PAM. PAM is integrated in CEM, you can't replace PAM

[set]

thanks for the info
is it really possible to reprogram it?
or the only way out is to replace the parking sensor

[set]

I thought that changing the parameter 305. PARKING SENSOR GENERATION (gen 5/gen 6) could help solve my problem. I know that the Volvo XC90 had two “generations” of parking sensors 2015-2019 and 2020-2024. Accordingly, I thought that before 2019 there was gen 5, and after – gen 6. I expected that I would have a gen 5 setting, and by changing the setting to gen 6, I would solve my problem. But when I opened the orbit, I saw that in parameter 305 I have gen 6. Accordingly, I cannot increase the generation of parking sensors. Maybe someone can tell me where to look for a solution to this problem?

[Marcp]

Hi, the same thing happened to me; I just had to find the correct sensors. I ended up using the same part number for all 12 sensors. I understand you didn't add any sensors, just replace them?

[set]

my story:
i bought a car without front and rear bumpers. My car is 2019 and I bought new bumpers from a 2020 car.
My car has park assistant in the menu - accordingly the sensors should work.
I know that there are at least two types of sensors before 2019 and from 2020. I don't know how they differ and how to make the car accept the new sensors.

I think first I need to know which (number) sensors should be installed from the factory. Can you tell me this information? my VIN YV4A22PL1K148844

[IMAY2023]

It has nothing to do with the bumper or the style. 
Parking sensors goes to the CEM and not WAM You need to check if the wiring is correct and you have the correct bumper harness that fits the car's equipment level. 
Check your sensus function screen...
If you have "park in / out" buttons (semi automatic parking), this means you need 12 sensors.  (6 front and 6 back) and the correct bumper harnesses.  In this case, if you do not connect all the 12 sensors, parking aid will not work at all. 

If your car does not have the  "park in / out" buttons (semi automatic parking) buttons, this means you have only 8 sensors in total. 

Front and rear sensors are different.  Take a look at this guide with part number 31414261 which should include all the sensors.

[set]

by standard (from the factory) I should have these sensors
https://usparts.volvocars.com/p/Volvo_20...71005.html
now installed (along with wiring) these
https://usparts.volvocars.com/p/Volvo_20...09358.html
I have 12 errors:
CEM-B129C14 - 2025/10/29
Left Front Side Sensor- General Electrical Failures- Circuit short to ground or open

CEM-B129D14 - 2025/10/29
Right Front Side Sensor General Electrical Failures- Circuit short to ground or open
…..
CEM-B1B5014 - 2025/10/29
Left Rear Inner Sensor- General Electrical Failures- Circuit short to ground or open

question, how do they differ? and can it be fixed (coded) using orbits

[IMAY2023]

There is no coding for the sensors after replacement. The sensors are connected to the CEM, check the guide I posted earlier. 
Most likely you have wiring issues. 
Each sensors has 3 wires. 2 of those wires are common. (ground, positive) the third middle one is the signal. Get a multi meter and check the wires if they short or have continuity end to end.   
The pumber harness should have a connecter on the driver side behind the wheel arch.  Rear bumper harness has a connector at the right side. From those connectors wires go to the CEM.