Disco 2 heated seat problem

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berg450

Well-Known Member
Posts
665
Location
Hungary
Hi All

My seat heating is not working on both driver and passanger sides. The fuses are OK, the switch lights are on. Any idea where should I start looking for the problem?

Thanks
 
From the drawings I've attached, you should be able to see that tere is a single fuse for both seat heaters, fuse F15 (20 Amp) on the passenger's compartment fuse board below the steering wheel.
The power feed from there splits off to each seat heater switch and from there to the module under each seat. The power from the heater module is fed to the heater elements, the seat cushion and the seat back or squab are wired in series. The thermostat monitors the seat cushion temperature and controls the activity of the heater module.
Thinking about faults which could affect both seats, they could only be in the "Auxilliary circuits relay", the 20 amp fuse or the ground connection.
Don't disregard the possibility that both seats have gone faulty individually. The areas to consider there would be both heater elements gone faulty, or both thermostats. If you're unlucky then it could even be both heater modules.

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Have you had them working since you've owned the car?
No. I have bought the car summertime, checked the heating and found them out of order. Asked the previus owner about it. He has told both were ok during last winter. To be honets I have not cared much about it until now. If it can be fixed easily I will do if not I will leave them.
 
From the drawings I've attached, you should be able to see that tere is a single fuse for both seat heaters, fuse F15 (20 Amp) on the passenger's compartment fuse board below the steering wheel.
The power feed from there splits off to each seat heater switch and from there to the module under each seat. The power from the heater module is fed to the heater elements, the seat cushion and the seat back or squab are wired in series. The thermostat monitors the seat cushion temperature and controls the activity of the heater module.
Thinking about faults which could affect both seats, they could only be in the "Auxilliary circuits relay", the 20 amp fuse or the ground connection.
Don't disregard the possibility that both seats have gone faulty individually. The areas to consider there would be both heater elements gone faulty, or both thermostats. If you're unlucky then it could even be both heater modules.

View attachment 136212

View attachment 136213
Thanks, I will check!
 
I could not go too far with the investigation yet, just checked one thing today. I have started the check from the heating element and measured the voltage on the C0969 connector. I have measured between CAV 1 and 4 and found 12 volts with the heat switch on. Was my measurement correct and does it mean that the heater element has gone?
 
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