Key fob detection issue

[Kacsavadasz102]

Hoi,

I recently bought a 2015 ST180 (in Germany), but my keyless start seems to have some sort of error. If I get it correctly, it should be enough to have the key somewhere in the car, to start it, but in mine, I have to hold the key next to the antenna indentation on the steering colum to be able to start. I think this place should be only used if my battery dies in the fob. The fob can unlock/lock the car from around 25-30 meter.

1. I tried to change battery in the fob, for new Varta, and new Duracell, with both the main and spare key, but it did not change anything.
2. Had battery replacement in the car since, not that it should cause these type of an error.
3. Checked by ForSCAN to see, if there is any setting disabled, but didn't found anything related.
4. Replaced the keyless antenna behind the handbrake.
5. The trunk is opening with the button on it, if the key is near.
6. Took it to a guy, who's living is key programing and cutting, he tried to reprogram the fob, also to program a new fog, but had some issue coming up with both of his attempts, he was able to program the new fob to lock/unlock the car, but not for the keyless start.

I'm guessing the previous owner must have done something with it, maybe some anti-theft stuff, and of course it is probably safer like this, but I would like to have a final decision if I want this or no. And also, it fucks my brain, what it could be.

I would like any suggestion, in regard what to check/try, but please, I think it is fair to say, that it's not the battery in the fob, so please don't waste each other's time with that.

 

[Frisk]

can you check the circuit for the keyless antenna? use a multimeter to see if it has whatever voltage is required? it sounds like something upstream of the antenna is shorting.

 

[Officialdillz]

Did you ever solve this ?

 

[Officialdillz]

Hoi,

I recently bought a 2015 ST180 (in Germany), but my keyless start seems to have some sort of error. If I get it correctly, it should be enough to have the key somewhere in the car, to start it, but in mine, I have to hold the key next to the antenna indentation on the steering colum to be able to start. I think this place should be only used if my battery dies in the fob. The fob can unlock/lock the car from around 25-30 meter.

1. I tried to change battery in the fob, for new Varta, and new Duracell, with both the main and spare key, but it did not change anything.
2. Had battery replacement in the car since, not that it should cause these type of an error.
3. Checked by ForSCAN to see, if there is any setting disabled, but didn't found anything related.
4. Replaced the keyless antenna behind the handbrake.
5. The trunk is opening with the button on it, if the key is near.
6. Took it to a guy, who's living is key programing and cutting, he tried to reprogram the fob, also to program a new fog, but had some issue coming up with both of his attempts, he was able to program the new fob to lock/unlock the car, but not for the keyless start.

I'm guessing the previous owner must have done something with it, maybe some anti-theft stuff, and of course it is probably safer like this, but I would like to have a final decision if I want this or no. And also, it fucks my brain, what it could be.

I would like any suggestion, in regard what to check/try, but please, I think it is fair to say, that it's not the battery in the fob, so please don't waste each other's time with that.

Did you find the fix?

 

[Kacsavadasz102]

Did you find the fix?

Nope, I didn't had the time yet to dissasemble the middle to get to the antennas yet. I checked the one at the boot, that has the correct voltage according to the maintenance manual.

 

[Lee_FST]

Nope, I didn't had the time yet to dissasemble the middle to get to the antennas yet. I checked the one at the boot, that has the correct voltage according to the maintenance manual.

I found both mine today one is just under the arm rest in the centre console handbrake cover bit, and the other was under the rear seat cushion, there was no more in the centre console but just that one under the arm rest

how do you test voltage then ?
Really wanna solve this problem now

my key fob lock and unlock buttons operate fine but will only turn on ignition if I hold the key to the cowling in the emergency position

 

[Intuit]

There should be code(s) stored in the BCM.
What are they?

Removed Headliner - Interesting Side Effects...
https://www.fiestastforum.com/threads/headliner-removed-interesting-side-effects.23500/
Passive Anti Theft Security (PATS)...
https://www.fiestastforum.com/threads/keyless-physical-buttons-stopped-working.32598/
https://www.fiestastforum.com/threads/what-did-you-do-to-your-fiesta-st-today.1441/post-504323

 

[Intuit]

May also want to seek out the owner's manual and look for details on a key that's been deactivated due to being left in the vehicle.

 

[Kacsavadasz102]

Okay, so, there should be 3 sensor. 1 under the rear seat, one under the arm rest, and one above the shiter, behind the heated seat buttons, it is easy to miss, as it is put on the inner side of the plastic.

Today I checked all 3 again. The service manual says that the sensor should have under 3 ohm resistance, if one of them is between 3-5 then change that. For me the front 2 was at 2.2 ohm, and the rear was 2.5, I guess because of the long pigtail.
I will contuine with the checking later, sadly the rain started, so I had to stop...

Spoiler: Service Manual