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Yet another answer Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 13 Sep 2006 05:04:05
In Reply to: Passenger Side Heated Seat? (1990 900s 4dr), pcgeek, Mon, 11 Sep 2006 13:09:10 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The passenger seat is heated. It does not have a controller.
There is a pressure switch under the seat to detect if someone is in the seat. There is a thermal switch inside the seat. If the seat itself is colder than about 45 degrees, AND there is weight in the seat, the switch closes and applies 12 volts to the seat heater element. Once the seat warms up to about 70 degrees (F), the thermal switch opens. It keeps this open-closed sequence as the seat cools off.
This is the same method Saab used for years before they went to the seat controller. Way back when in '73 when they had seat heaters, that's the way it worked. The controller only first showed up in '86 in the 9000, and made it into the 900 sometime in the early 90's, but only on the driver's side. But since at least 1980 both seats in the 900 had heaters.
Now, a very common failure is for the heating element to break. If that happens, the seat won't get warm. The typical location for the heating element to break is at the front outside of the bottom cushion, as that gets the most abuse when someone is getting in and out of the car. The way to check it is to measure the continuity of the heating element at the electrical connector under the seat. Since the thermal switch is inside the seat, the only way to check it is if the seat is cold.
posted by 192.249....
, Wed, 13 Sep 2006 05:04:05 <-- Viewing This Message
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