Where is the heated seats button placement Toyota Starlet -87

[toyotawaichibankuruma]

Hello,

I have just aqquired a starlet in original condition (and I am  going to keep it as close to original as I can) and according to the user manual and a sticker in the car it is fitted with heated seats but I cannot find any button to turn it on. Does anyone have any idea where it might be located?

I checked under the front seats and there is cords going to the chairs so I am pretty sure it has it. Would be nice to have it working now that winter is coming.
Also the manual doesn't say where it is located, it just states that it has heated seats.