Heated seats stopped working

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Re: Heated seats stopped working

Post by EDC5 »

Is the key the same frequency? There are 433MHz and 434MHz types depending on age.

Have you attempted to synchronise the remote function?
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Re: Heated seats stopped working

Post by Cutac »

According to the aliexpress listing, it's a 434Mhz model.
I did try to synchronise, using various methods, but neither of them worked.
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Re: Heated seats stopped working

Post by Cutac »

And according to my VIN on service.citroen:
LOCKING REMOTE CONTROL FREQUENCY 433.92 MHZ HETERODYNE
But on the plaque I recieved with my car keys(when I bought the car), it says 433Mhz key made by Delphi.

Can that be changed in Diagbox maybe?
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Re: Heated seats stopped working

Post by GiveMeABreak »

Because it probably isn’t compatible with the earlier system in your C4. The circuitry and software have to be compatible with the car’s architecture. It’s like trying to use tech from a 1995 chip to work with a car today, only in reverse.
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Re: Heated seats stopped working

Post by Cutac »

But it's weird since I've got the same 3 button key and it works from the factory.
I've checked few cars on service(2011, 2013 and 2014, which is exclusive) and all have that same 433.92 Mhz frequency. So how come are my factory keys 433 MHz?
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Re: Heated seats stopped working

Post by GiveMeABreak »

Ok 2 separate things going on here. There is the transponder chip for the starting of the car. Then there is the remote locking and unlocking using the fob and optionally a middle button for lights or boot opening etc.

So although the transponder chip has been coded and paired successfully, the other electronics for the remote function may not.
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Re: Heated seats stopped working

Post by Cutac »

Yeah, I know that, but I have a three button key from the factory and it works, but the exact same one from aliexpress doesn't.
If my car has 434MHz reciever, how does the factory 433 MHz key work?
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Re: Heated seats stopped working

Post by GiveMeABreak »

But are you understanding? The MHz is just the frequency the remote is operating on. If it is not sending the right information it won’t make any difference, i.e. it may be sending garbage if the BSI us not understanding the message, regardless if the frequency!


Let’s clarify something first. When you paired the new key with Lexia. Did you pair ALL the keys together in the same session?

If you did this then your Ali key is probably not compatible.
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Re: Heated seats stopped working

Post by GiveMeABreak »

Cutac wrote: 23 Aug 2018, 20:48
One quick question so I don't open a new topic.
Bought a new 3 button key for 2011 c4 from aliexpress and it doesn't work. It's been cut and synchronized to the BSI(car starts with it), but remote functions don't work. Battery is new. Any ideas?
I've moved this to a new topic as it is a completely different subject. Please make any new posts concerning the Key Fob on the new thread here:
viewtopic.php?f=3&t=60763
Thanks
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Re: Heated seats stopped working

Post by Cutac »

So I've peeked under the seats and wiggled the cables, but no luck. Some day I'll buy a new fuse and replace it. If that doesn't work, what next?
I'll check the Diagbox tomorrow.
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Re: Heated seats stopped working

Post by GiveMeABreak »

It's cheap enough to try the fuse first - but then if that is not working, it may be possible that the wire under the carpet as per my diagram has become damaged or broken while you were giving it a good clean!
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Re: Heated seats stopped working

Post by Cutac »

Maybe there's an actuator test for heated seats in the Diagbox.
I'll update after I try something.
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Re: Heated seats stopped working

Post by GiveMeABreak »

No actuator test for heated seats Cutac - they don't have any tests, but check Fuse F7 in the interior fusebox - I've been checking some other info out for you:

Also, I don't know what the temperature is with you where you are, but....
  • If the temperature in the inside cabin is 30° C or over, the function is deactivated:
    Each seat has a temperature sensor (incorporated in the seat cushion) which exercises control independently through the regulation control unit for each seat. Position 3 on the heating control dial corresponds to a maximum seat cushion temperature of 40°C above which the heating of the seat is stopped. If the passenger compartment temperature is above 30°C, the temperature inside the seat can still reach 40°C and so prohibit the heating of the seat.
  • If the heated seats are not operating properly, the electrical power management system can request deactivation of operation of the heated seats with the aim of keeping the battery voltage level higher than or equal to 12,8V (Load reduction function)
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Re: Heated seats stopped working

Post by Cutac »

It's been over 30 degrees here for a while.
I could be interior sensor that's faulty, but then the Air con would act up, wouldn't it? Would it show a fault in the Diagbox? Diagbox shows three faults: two are side lights because of LEDs and one is P1644, speed limiter fault(don't know how to fix that).
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Re: Heated seats stopped working

Post by GiveMeABreak »

The way to test it is go out in the evening when it is cooler and see if they work then.
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