Picasso II (B78) Parking Sensors

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WillyR
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Picasso II (B78) Parking Sensors

Post by WillyR »

Afternoon all,

Our 2015 Grand Picasso II (B78) EAT6 suffered a VERY SLIGHT bump at the rear yesterday when I was reversing out of the way of Mr Impatient in a car park.
1. Both my wife and I do not remember hearing the audible warning which worked perfectly up until an hour previously
2. The point of contact was where the two left hand corner sensors are located and left no marks on the paintwork or sensors although a slight flexing of the bumper corner can be seen to have taken place.
As soon as I left the car park, the Sensor Failure Alarm displayed, and every time I stop the car it warns me that Parking Assistance is not available.

When I got home, I tried the first repair - disconnect the car battery for 2 hours. This appeared to cure the problem until I started and moved the car (after waiting 2 hours before resetting the Time/Date and other functions) when the same warnings reappeared. The Parking Sensor function is now permanently ORANGE, and cannot be change by tapping the Icon.

Potential other faults already existing before the incident - mentioned here in case they are common functions with the Parking sensors.
1. Stop/Start ceased over 2 years ago around when the battery reached 5 years old. The 7 year old original battery was replaced with an AGM096 from Halfords two weeks ago, and for the first 3 or 4 days the Stop/Start worked as if the car was brand new, then stopped. It just shows Flashing ECO every time I stop now. I'm not highly impressed with the new battery as it starts the car no better than my 7 year old original battery did (I checked the charging voltage with engine running and it is 14.2-14.4V. On switch off ignition. the shutdown current drain starts at 3A and slowly drops to a constant 40mA after about 2 minutes, which seems a little high, although there are an awful lot of sleeping systems on board).
2. The LDW stopped working about 6 months ago, although the cruise control is still active, and the seat belt shake function still works on reaching 10mph after engine start, and emergency belt tighten works perfectly in emergency stop or approaching accident triggers it. The windscreen was replaced 5 years ago, and the LDW worked perfectly until recently.
3. The Blindspot warning has a temperamental hissy fit every now and then but testing it is not easy especially with no passenger onboard to keep note.

I will get down under the car in the next couple of days to see if the sensor wiring has been disturbed or damaged, but in the meanwhile, I would be grateful for suggestions. I will also be heading to a diagnostic centre to have the fault codes read, because the 2 OBDII readers I have show nothing.
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GiveMeABreak
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Re: Picasso II (B78) Parking Sensors

Post by GiveMeABreak »

Parking Assistance: Ok, so if any one of the parking sensors is damaged it will deactivate the parking assistance function for safety. These ultrasonic sensors are very sensitive and don't take well to any knocks. A proper diagnostic can indicate which one is faulty.

Blind Spot Monitoring:The Blind Spot monitoring system uses the outermost sensors in the front and rear bumpers (the side facing ones), so if you have knocked the same one in the accident that could be why the Blind Spot system is on the fritz.

Battery / Stop Start: When you have a new battery fitted the Battery Charge Status Unit system needs hours (overnight in some cases) to calibrate. This can affect the A/C system too.

The Stop Start won't start working again until all the pre-requisite conditions are met. After a decent run, you might find it settles down and starts working again. Try and avoid charging accessories in the car or listening to the audio system without the engine running as this can pull the battery below operational parameters for systems like the Stop Start.
WillyR
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Re: Picasso II (B78) Parking Sensors

Post by WillyR »

Thanks Marc.
Regarding the Stop/Start, when I took the car out for a drive about an hour after replacing the battery, the stop/Start worked perfectly, which I found a little strange following all the comments I have read previously, and yours today, that the S/S will take a while to settle down. Anyway, after nearly two weeks with 3 or 4 30-mile trips up and down the Motorways included in my town driving, I'm a little surprised it hasn't kicked in after its initial 4-day exhibition of perfect S/S operation. I'll have to keep an eye on it. I'm off Up The Smoke this weekend, so I'll see what 150 miles does for the S/S.

Is there any FCF history of troubleshooting the LDW failure, given that the seatbelt shake functions work perfectly on Drive-Off, Emergency Brake and Collision Warniing?

****
Before I part with too many "readies" at a Dealer, do you have any members with suitable Picasso II diagnostic readers in my Area (I'm happy to travel 50 miles) which is Ashford, Kent, who might be willing to read the memory faults (the wife already knows all of mine, but she would be happy to receive confirmation. Ha Ha) on the car?
****


Will
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myglaren
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Re: Picasso II (B78) Parking Sensors

Post by myglaren »

WillyR wrote:Before I part with too many "readies" at a Dealer, do you have any members with suitable Picasso II diagnostic readers in my Area (I'm happy to travel 50 miles) which is Ashford, Kent, who might be willing to read the memory faults (the wife already knows all of mine, but she would be happy to receive confirmation. Ha Ha) on the car?
****
There is a list of members with Lexia/Diagbox equipment here with a map at the end of it.

GF1969 is in Ashford but hasn't logged in since last August. Try sending him a PM and see if he can accommodate you.
WillyR
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Re: Picasso II (B78) Parking Sensors

Post by WillyR »

myglaren wrote:
22 Apr 2022, 14:33
WillyR wrote:Before I part with too many "readies" at a Dealer, do you have any members with suitable Picasso II diagnostic readers in my Area (I'm happy to travel 50 miles) which is Ashford, Kent, who might be willing to read the memory faults (the wife already knows all of mine, but she would be happy to receive confirmation. Ha Ha) on the car?
****
There is a list of members with Lexia/Diagbox equipment here with a map at the end of it.

GF1969 is in Ashford but hasn't logged in since last August. Try sending him a PM and see if he can accommodate you.
Thanks very much for the information :clap: . I'll try the local Ashford member first, then go further if I get no response. =D>
WillyR
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Re: Picasso II (B78) Parking Sensors

Post by WillyR »

UPDATE from my post Picasso II (B78) Parking Sensors - Post by WillyR » Thu Apr 21, 2022 3:53 pm

1. Stop Start is perfect. It just needed a good run, and as I'm retired, I don't used the car every day any longer.

1a. LDW is still not working, and a full diagnostic scan shows nothing remotely looking like the LDW function. This is obviously a dealer job, unless anyone has any ideas.

2. Rear parking sensor failure has been diagnosed as B1224 - OUTER LEFT REAR (sideways pointing sensor - the hardest one to get to). It was the only device that stayed permanent after I cleared all the fault codes and took the car for a drive - B1224. The only other faults allied to the Parking system (sensors and autopark) were B122C and B122D - Left and Right Mirror Parking Assistance Cameras, showing INTERMITTENT.

I will remove and test the two most left hand parking sensors, if I can get them out. Does anyone have a pictorial showing how they are clipped into position, please? The only Youtube information I could find suggests removal of the rear bumper. That is NOT going to happen.

FURTHER INFORMATION...
I note that Bxxxx codes are not considered proper Citroen codes by @GiveMeABreak in a previous post to someone else on FCF. The Diag Box I used was a TOPDON ArtDiag800 BT, using the Citroen App v41.70, so there is a possibility that this faulty sensor has been incorrectly diagnosed. However, the box recognised my car, including VIN and vehicle identification, so I'm happy to believe it for the moment.