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Author Topic: Changing front parking sensor  (Read 688 times)

Offline G谩bor B贸dy

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Changing front parking sensor
« on: March 14, 2019, 08:11:00 PM »
Hi!
I have a 2014 S-Max (2.0 TDCI) with malfunctioning parking aid.
According to my service it is the front inner parking sensor which is faulty.
I don抰 want to spend a fortune for this repair, as the sensor itself is relatively cheap and should be quite easy to access.
Does any of you have experience with such a diy job?
How can I remove the sensor? I don抰 dare push it hard...
Any diagrams, pictures Ican use?

Any advice is appreciated.

Offline brianh

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Re: Changing front parking sensor
« Reply #1 on: March 14, 2019, 10:22:36 PM »
I've not dealt with them on an S-Max, but on the mk2 and on the Espace that i have dealt with them on, they have 2 clips on the back, you need to prise them apart enough to allow the sensor to slide out (it may push in once you do that).

Best bet is have a look for a new sensor of the right type for your car, then look at the pictures and you should be able to see whats holding it. The most difficult one I had was on the Espace as you had to remove the bumper for the rear ones as no space available on it, front one may be easier as theres usually a bit more space available, but not owning an S-max I can't advise further than that.

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #2 on: March 15, 2019, 04:06:45 AM »
Hi brianh!
Thanks for the answer. I have checked numerous pictures of the sensor itself but I can not find any picture of the housing. I have already purchased a sensor so I suppose  will finally find those clips you mentioned. I might use a dentist mirror to se the installed part bakwards. It might give a hint as well.
I think I am lucky as the inner / front sensors ar quite easy to reach, they are sitting in the plastic grill so I can feel the cables with my finger (but could not dentify the clips blind).

I am going to make some pictures and will post it if I succeed.



Any chance someone has a pdf version of the Haynes S-Max manual?

Offline brianh

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Re: Changing front parking sensor
« Reply #3 on: March 15, 2019, 08:13:02 AM »
I don't think haynes actually do a manual for the S-Max.

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #4 on: March 15, 2019, 12:05:27 PM »
 ;)

https://haynes.com/en-gb/ford/s-max/2006-2015
(Hope it is not against the rules to leave a link such way)

I will consider buying it if I can not solve the issue self.

Offline brianh

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Re: Changing front parking sensor
« Reply #5 on: March 15, 2019, 02:35:07 PM »
I don't think you will find the manual much help on the parking sensors - my feeling would be it will either not be mentioned, or have very little detail.

This is the one off my MK2 - The arrow shows the retaining lug. The holder for it on mine came off with the sensor, but some glue sorted that out. It should just be a case of finding the retaining lug and pushing the clip up to clear the lug, then slide the sensor out (there will probably be 2 lugs).

If you can get to the back of the sensor, it should be fairly obvious whats holding it.

Don't think theres any problem with the link you posted, as its linking to the publishers own site.

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #6 on: March 15, 2019, 04:20:56 PM »
Thanks for the picture and the comment. With the help of a dentist mirror and your picture I could localise the lug. It was child抯 play to change the sensor afterwards. Sadly it did not fix my issue. I did either purchase a defectiv sensor or I have other issues with the system. According to the service it is definitely a sensor failure. Should they get the same error code if it is cabel related problem?
I paid 40 for finding the failure and they want 130 more for changing the sensor. The sensor I bought costs 16....

Offline brianh

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Re: Changing front parking sensor
« Reply #7 on: March 15, 2019, 05:40:37 PM »
Which front inner sensor though? Did they tell you left or right? If not, I'd try swapping the other side inner one as your next step (with either the one you removed, or the new one, shouldn't make any difference as long as they both work of course)

Forscan might tell you what sensor it is if you have a lead and laptop, even if you have to buy a lead, the one i got was about 20 and forscan can be had for free for what you require (access to PATS needs a license, but you don't need that). It does list Parking Aid Module (PAM) under supported modules, but I don't know if that will work on the S-Max - though someone else might (and its not like its a brand new car, so you have more chance of support as they have been around for a few years now).

https://forscan.org/home.html

Example lead - this one should be fine as it has the switch, and only 8.59!
https://www.ebay.co.uk/itm/ELM327-USB-modified-for-Ford-ELMconfig-HS-CAN-MS-CAN-Forscan-OBD2-ELMconfig-UK/202574770197

I don't know if you need to clear codes after swapping the sensor - Ford's usually don't need that, but its possible thats your issue as well - the cable would fix that, and be cheaper than another diagnostic session.

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #8 on: March 15, 2019, 06:39:44 PM »
They said it is the right one. Unfortunately I did not get any written proof. I will ask for it  after the weekend.
I have tried the Forscan pc version with an average wired odb checker. I did not get any useful result, at least no pdc fault code. This was right before I booked a visit to the service. I am avare that there is difference between odb scans so another piece might produce some info. I will check the provided links, thanks.
I will even try to switch the sensors as well.

Offline brianh

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Re: Changing front parking sensor
« Reply #9 on: March 15, 2019, 07:04:43 PM »
I'm not 100% sure that the interpretation of Right would be looking from the front end of the car, or the drivers seat. Change it would be your first step I'd suggest with the other side inner one and see what it says. Hopefully someone else might contribute and confirm if Forscan will tell you anything with the right lead.

You probably need the lead that supports the ms pin type - theres some detail about it on the Forscan site, but easiest way to identify the lead is use one marked as compatible with Forscan, They should have the switch like the one I linked to above.
https://forscan.org/forum/viewtopic.php?f=4&t=4

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #10 on: March 15, 2019, 08:00:09 PM »
Thanks, Imwill check it.

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #11 on: March 16, 2019, 03:12:51 PM »
Tried both front inner sensors. Still no luck. Gonna buy a modified ELM forscan reader. Hope it gives some extra info. I will even contact the service to get their results, this time more detailed...

Offline brianh

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Re: Changing front parking sensor
« Reply #12 on: March 16, 2019, 07:25:18 PM »
I think thats your best bet - at least you have the cable for next time theres something wrong that way, so will save you spending on diagnostics.

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #13 on: March 21, 2019, 06:47:52 PM »
So.... I received the Forscan Elm scanner. As for the parking assist problem, I got B1B38:01 dtc code - front right inner sensor, general electric failure (or something like that) I have changed the sensor again, run the test at got the same dtc.
Do I have to erase the dtc code after changing the sensor?
As service procedure I see reset modul option. I did not dare doing it yet.

Offline brianh

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Re: Changing front parking sensor
« Reply #14 on: March 21, 2019, 06:58:25 PM »
You'd be best to erase the code having swapped the sensor and see if it comes back. At least now you know which sensor your dealing with (I'd imagine thats right as in viewed sitting in the driving seat). Bear in mind that a wiring fault on that sensor will also cause the error though.

It might be worth unplugging the sensor you suspect to be the faulty one, then scanning for codes again - if no further errors (or at least no ones that refer to another sensor) come up then you know your dealing with the right sensor.

Offline johnnyroper

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Re: Changing front parking sensor
« Reply #15 on: March 21, 2019, 09:40:54 PM »
Did you fit new sensors? Might be worth swapping with a known good one from other side of bumper and testing again see if same fault remains. If it does you need to continuity test wiring from plug back to control unit to confirm wiring fault or control unit error.

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #16 on: March 22, 2019, 06:31:38 PM »
So....
I had a discussion with the service. They said that they ran an odb test and afterwards they have checked the cables. They are sure that it is the sensor itself which is malfunctioning.
I have removed the left inner sensor and ran a test again. Now I got 2 dtc from the PAM. I have switched the sensors, cleared the dtc and ran a test again. Again front inner right sensor failure. I inspected the reachable cable length, no visible deformation or damage.

How can I check the wiring? Where can I get a diagram? What tools do I need?

I have such a feeling that the service lied to me....

Offline brianh

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Re: Changing front parking sensor
« Reply #17 on: March 22, 2019, 07:58:34 PM »
Well you know the lefthand sensor is definitely ok as far as detecting an error goes, so thats progress and sounds like you have ruled out the sensor to me.

If it doesn't clear the error then you know its not the sensor, could be any point in the wiring, but the easiest bit to check (and the bit most likely to suffer damage) is the bit that runs across the bumper. Don't know how easily you can access the wiring but if you can trace its path it may plug into another section of the loom somewhere - I've only had to mess with the wiring on an Espace, but that has a plug at one end of the bumper to allow you to swap the whole loom that runs across the bumper, I'd guess thats fairly typical as there is occasions you'd want to remove the bumper anyway. It could be elsewhere in the loom, I don't know where the controller for the parking sensors actually is, but I'd suspect they head back to it somehow along one side or another of the car. Have you had any work done on it prior to the fault appearing? (even unrelated work might be enough to dislodge a connector enough for it to cause a problem later)

Its worth unplugging any related connectors you find and making sure they are properly seated back together however they go as well while your there.

If you can get yourself a multimeter you can then test for a connection between either end of the cables - you know which one is the sensor with the problem, so find those matching colours at the other end, and test either for resistance (should be a pretty low value on the ohms setting) or continuity (multimeters usually have a setting that will produce a tone when the probes touch together, so if you have them either end of the same piece of wire it should make a sound).

If one doesn't seem to connect when it should, then you have a problem somewhere in the cable - they can corrode from inside sometimes, in which case find the bad bit and remove it, and replace with new (the ends or any bits that have had damage to the outer insulation are the likely problem there)

Also inspect any connectors you can find - any signs of green or white deposits would be indicative of water getting in where it shouldn't be, clean what you find and dry the connector out if so, and try to seal it against the elements if possible (but don't do so in a way you can't remove it in future if required - insulation tape is a good bet for that as you can cut it away if required).

Offline johnnyroper

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Re: Changing front parking sensor
« Reply #18 on: March 22, 2019, 11:18:36 PM »
As said continuity test from sensor back to control unit,so long as you have a meter and know where control unit is the drawing isn抰 really required. You will find a shared earth and shared feed to all sensors then a feedback from each sensor. Just bell out the plug on sensor back to controller see if all wires have continuity. If not wiring break somewhere,if they do control unit kaput

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #19 on: March 23, 2019, 10:18:13 AM »
Thanks for the recommendations. One of my friends has a meter. I will check it with him.


As for Your question brianh, I did not do any work on the car. We just used it when the problem occured. Were not even near a car-wash either. :-) First the problem was intermittent for few days, afterwards permanent.

Offline brianh

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Re: Changing front parking sensor
« Reply #20 on: March 23, 2019, 04:27:40 PM »
Its worth asking only as it gives an idea what might have happened - welding work is the worst for it, where things accidentally get melted etc by the work going on in the area.

Offline G谩bor B贸dy

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Re: Changing front parking sensor
« Reply #21 on: March 23, 2019, 10:40:32 PM »
So we checked it with a multimeter today. Found the multi connector under the right lamp. One cable seems to be damaged. Continuity test failed with the purple/gray wire between the 2 sensors and between the right sensor and the plug.
I have purchased from ebay the Haynes online manual, but unfortunately I did not find any info about the wiring of the sensors...

We did not remove the bumper as we can not lift the car.....

So at the moment this is how far I can go.

But I might speak with the service and discuss my concerns (they lied to me, they did not do any manual check just run the odb....)


Offline brianh

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Re: Changing front parking sensor
« Reply #22 on: March 23, 2019, 11:02:41 PM »
Well at least you've isolated the problem now, so thats progress. If its not the connector itself you should be able to replace the damaged bit of cable, but without removing the bumper that will be rather tricky. Alternatively you might be able to obtain a replacement harness, but its unlikely to be cheap unless you can find one in a scrapyard thats suitable (unlikely I'd suspect given the age your dealing with most of them are likely to be scrapped due to accident damage, and the bumpers are the obvious place thats likely to effect).

Wiring is better news than the control unit though, at least you can fix that. And now you have the diagnostics for next time you need them for less than the cost of another diagnostic session.

 

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