[michaelacy]

I have a my2017 V40 T3 right hand drive in the UK. Really lovely car but bought with the knowledge that it had a front repair outside of the Volvo system. I had it serviced by the Volvo agent who passed the mechanical repair that had been done but wouldn't warranty either the Pedestrian Protection system or the Adaptive Cruise control. Both these functions show dash messages.

I have read on various forums that the separate Pedestrian Protection System ECU needs to be 'cleared' - the agent just wants to replace it at huge expense. I see that specialists offer to clear this ECU for about £60 - but is it that simple? and if it is that simple where is this ECU located in a RHD vehicle?

Next item is the Adaptive Cruise Control - again the agent has checked out the camera, the calibration etc and wants to swop out the radar unit itself for lots of money! However if I select this function soon after starting the car it works just fine, but 5 minutes later it stops working and a service message appears. Surely if the radar unit was faulty it wouldn't work at all?

If anyone has had the same experience or can throw light on the above I would appreciate it very much.

Cheers

 

[MagaDS]

So first things first:
you don´t know what the damage extension are and how the repairs have been done. The sensors in front of the vehicle, the cameras in the windshield and if the windshield was replaced, if the pedestrian airbag was deployed... You have that answers?
It could be a lot of things... just not connected sensors or beeing damaged, the pedestrian airbag not set in place because the repair of it it's a expensive cost and if you have a new windshield, the cameras have calibration to make. In all regular maintenances, the Volvo mechanics check that, clean it properly and reset the system.
I think you have to be patient and follow some path to solve the issue.

Related to Adaptative cruise control i think that's almost the same point: If the windshield was replaced, calibration and maintenance of the cameras are critical. Check it in a Volvo dealership and could be the solution for both problems

 

[michaelacy]

So first things first:
you don´t know what the damage extension are and how the repairs have been done. The sensors in front of the vehicle, the cameras in the windshield and if the windshield was replaced, if the pedestrian airbag was deployed... You have that answers?
It could be a lot of things... just not connected sensors or beeing damaged, the pedestrian airbag not set in place because the repair of it it's a expensive cost and if you have a new windshield, the cameras have calibration to make. In all regular maintenances, the Volvo mechanics check that, clean it properly and reset the system.
I think you have to be patient and follow some path to solve the issue.

Related to Adaptative cruise control i think that's almost the same point: If the windshield was replaced, calibration and maintenance of the cameras are critical. Check it in a Volvo dealership and could be the solution for both problems

Many thanks for taking the time for this response, very helpful. I did have the dealer check on these things and they recalibrated the camera, cleaned, checked the airbag etc. No indication that the airbag was deployed, I understand that it does a lot of damage when it goes off and the mechanic working on it didn't think it had. The sensors and the wiring loom are suspect and if i was to do the repair I would change those out as its relatively straightforward to do. The main issue I had was that they wanted to replace the ECU and what I was trying to ascertain was the necessity of doing so.

Again many thanks for your reply,

Cheers,

 

[MagaDS]

Many thanks for taking the time for this response, very helpful. I did have the dealer check on these things and they recalibrated the camera, cleaned, checked the airbag etc. No indication that the airbag was deployed, I understand that it does a lot of damage when it goes off and the mechanic working on it didn't think it had. The sensors and the wiring loom are suspect and if i was to do the repair I would change those out as its relatively straightforward to do. The main issue I had was that they wanted to replace the ECU and what I was trying to ascertain was the necessity of doing so.

Again many thanks for your reply,

Cheers,

Ok, so far so good. You have done a great job towards a resolution.
Talking about the ECU replace, it´s really an issue: in every car, all airbags and sensors are connected to a specific ECU that manage all the parameters,in our V40's this is more complicated you have loads of information to handle. anyways, this kind os ECU normally needs replace when a crash occurs, because when some airbags deploy, basically it blocks and needs one of two things: replacing (more expensive) or crash data reset. If you go to the second option, it's not available in volvo dealerships.
But it's possible that you have this ECU module with a failure not solved and sending that message to the main ECU...

We are here to help each other 🆒

 

[michaelacy]

Ok, so far so good. You have done a great job towards a resolution.
Talking about the ECU replace, it´s really an issue: in every car, all airbags and sensors are connected to a specific ECU that manage all the parameters,in our V40's this is more complicated you have loads of information to handle. anyways, this kind os ECU normally needs replace when a crash occurs, because when some airbags deploy, basically it blocks and needs one of two things: replacing (more expensive) or crash data reset. If you go to the second option, it's not available in volvo dealerships.
But it's possible that you have this ECU module with a failure not solved and sending that message to the main ECU...

We are here to help each other 🆒

Thought I would re-visit this problem rather than living with it! - Firstly I need to 'find' the ECU that's specific to the front collision system. This is a RHD T3 MY2017, anyone know where the ECU is?

 

[MagaDS]

Thought I would re-visit this problem rather than living with it! - Firstly I need to 'find' the ECU that's specific to the front collision system. This is a RHD T3 MY2017, anyone know where the ECU is?

Usually the specific ECU is in a middle are of the car, because in caso of collision it's still works to do his job, so i don't know where it is, but i'm guessing it stays under the center console or center dashboard.
In all cars is there the right location

 

[RS3100]

The PPS ECU should be behind the instrument cluster on the driver's (RH) side somewhere near the bottom of the A-pillar. Since the loom from the PPS airbag into the car travels towards the RHS of the car within the engine compartment, the location of the ECU should be the same on both RH and LH drive cars.

 

[michaelacy]

The PPS ECU should be behind the instrument cluster on the driver's (RH) side somewhere near the bottom of the A-pillar. Since the loom from the PPS airbag into the car travels towards the RHS of the car within the engine compartment, the location of the ECU should be the same on both RH and LH drive cars.

Just saw this, many thanks, I'll take a look.. its a bit elusive!!! - another question you might know, how many PPS sensors are there in the front bumper?

 

[RS3100]

Just saw this, many thanks, I'll take a look.. its a bit elusive!!! - another question you might know, how many PPS sensors are there in the front bumper?

Seven on 2013 cars. I can't say whether that is the same for all production years. Somewhere around 2015-16 the system was modified such that the explosive charged bonnet hinges were replaced with mechanical shear pin versions, which would have affected the wiring and ECU production or programming. Whether any other changes were made I don't know.