Citroen C4 Picasso (B78) 2014 - keyless door handle issue

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danlat1415
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Citroen C4 Picasso (B78) 2014 - keyless door handle issue

Post by danlat1415 »

I've got a C4 Picasso 2014 Exclusive that has keyless entry, so the door handles have a sensor on them.

The front passenger handle doesn't work with keyless entry. All the other door handles work fine.
I've just replaced the door handle (part number, sensor and cable all the same), as I've seen other cars where replacing the handle fixes it, but unfortunately it still doesn't work.

Does anyone know if it needs pairing or anything with Diagbox, or if there are any other parts that it could be that need replacing??
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GiveMeABreak
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Re: Citroen C4 Picasso (B78) 2014 - keyless door handle issue

Post by GiveMeABreak »

Assuming there's no dirt on the inside of the handle and that correct part was replaced (as there are several types depending on option and build date), then I can only suggest the wiring connection from the door aperture to the bulkhead may be broken (you'll need to check all the wiring connections at the plug where the door wiring goes through to the A Pillar / bulkhead) or that the hands free access ECU may be faulty or one of the hands free aerials along that side may not be picking up the identifier.

If you ordered the wrong part number for the build date then it's a possibility that it likely won't work as the revised part number may have specific changes to the sensor / electronics in the handle.
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Re: Citroen C4 Picasso (B78) 2014 - keyless door handle issue

Post by danlat1415 »

Please can you check the part number for the front passenger door - with hands free sensor?

VIN - VF7**************[VIN obfuscated, can be read by forum staff]


I've run Diagbox this morning and it's not showing any errors, and no ECU or BSI errors.
I've also gone through the REPAIR section and there is nothing listed for door handle sensors, only the driver door control panel.

So changing the door handle should have sorted.
I bought a new door handle - part number - 967853211T

That didn't work, so I got one from a salvage company - part number - 980297811T
That didn't work either.

Like you say, they look identical but have different part numbers.
I had assumed I got the correct part initially, and my original door handle got thrown away, so I can't check it now.
That door handle sensor has never worked on that particular door since I owned the car (bought second hand), so I couldn't guarantee that it was an original door handle either.


Looking into in more detail, it would seem that the correct part number for my year/model is - 1606874580 (Black handle with chrome trim). There is also 98029781XT but that is for coloured door handles without chrome trim and also appears to be without the sensor.
That part number is now fairly rare as it was replaced on newer vehicles with the part numbers above.

I'll try and source one and try that.
I'd still appreciate if you could confirm if that's the correct part number.

Thank for your help.
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Re: Citroen C4 Picasso (B78) 2014 - keyless door handle issue

Post by GiveMeABreak »

As you probably know Dan live parts data requires a membership upgrade (details below for future ref.), but as you've already supplied the part numbers, I can confirm that for the handle: 967853211T is the later replacement part for the original part: 1606874580.

980297811T isn't coming up as a valid part for your car.
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If you are having problems with it and have replaced the handle modules, then I would not be looking there, but more at the electrical wiring from the sensor module to the Hands Free ECU:

This is the Diagram for the passenger door handle sensor. You can see the sensor plug and why I suggested you check the door aperture wiring as this is where breaks happen when the door is opened and closed over time. There are 2 wires from the sensor and these go through an interconnection harness in the passenger cabin and ultimately to the Hands Free ECU as shown in the other diagram. I suspect one of these wires may be the cause as the sensor would be supplied with the handle. You may want to check the connection at the Hands Free ECU in case the wires have become disturbed.

84J2: low frequency aerial signal 1 for front LH exterior hands-free locking/unlocking buttons
84J3: low frequency aerial signal 2 for front LH exterior hands-free locking/unlocking buttons

Image


This is the location of the sensor in the door (8250)

Image



This is the location of the hands free ECU (8240)

Image
danlat1415
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Re: Citroen C4 Picasso (B78) 2014 - keyless door handle issue

Post by danlat1415 »

Thanks for your detailed response. I wasn't expecting so much detail.

None of the wires seem damaged and are all clean from what I can see. I'd need to strip more panels/trim off to get to the ECUs, but as there are no errors on Diagbox, I'm not sure if would be an ECU issue - so I was trying to rule out the handle first.

I'll have a look into it more - thanks for the wiring diagrams.
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Re: Citroen C4 Picasso (B78) 2014 - keyless door handle issue

Post by GiveMeABreak »

No problem. Any parts requests you need, pop a post up here:

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