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Re: Bench Test Seats Posted by DnstrDan [Email]  (#1361) [Profile/Gallery]
(more from DnstrDan) on Tue, 28 Dec 2021 14:05:18
In Reply to: Bench Test Seats, fdw201 [Profile/Gallery]
, Wed, 22 Dec 2021 15:53:42
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I swapped a heated (but non-ventilated) seat into my '99 SE, hoping for a warm winter's bottom. Alas, it did not work. Four years later, I was determined to make it work. Ultimately, I was successful. (Search previous posts under my name to see the details.) Here's what I would do if I were you:
0) You didn't say, but did you verify that you have the requisite harness (under seat, and behind the center console) pre-installed? With functional center console switches?
1) With the seats out of the car, you have a choice between active (live electrical) and passive (resistance and continuity) testing. I'd go with the latter method. Applying power to a seat with an embedded pyrotechnic device (air bag) can be hazardous if you are not scrupulously careful with making and verifying safe connections! With a multimeter, check across pins three and six of the seat side of connector H29. It should be less than five ohms. Since the seat and seat back pads are wired in series, a break in continuity (typically the bottom pad) would result in an open circuit reading.
2) Check the NTC thermistor circuit across pins 10 and 22 of the seat side of connector H29. It should be roughly 1000 ohms at 70 deg F. You can also test if the resistance increases by placing a bag of ice on the seat. You want to ensure that there is no open circuit condition regardless of temperature.
3) If the first two tests pass, and you've verified that there is power at the under-seat connectors (automobile side), then your heated seats should work following installation.
4) Similar strategy for verifying the blower motors. I took a quick look at the WIS and it appears that the two motors are wired in parallel. I don't know what the valid resistance should be but the readings should be similar for both seats. If one motor had a failed winding (open circuit), the resistance would be twice of nominal; an OOS reading would require that the windings on both motors (or a common wire upstream) be broken. Also check for a short circuit condition. Check the WIS for the appropriate wires to probe.
Some useful links follow. Please report back your results!
https://www.swedishwrench.com/seat.htm
https://www.saabnet.com/tsn/faq/heatseat.html
->Posting last edited on Tue, 28 Dec 2021 14:08:47.
_______________________________________ '04 9⁵ Aero Sedan (m/t) '04 9⁵ Aero Wagon (a/t) --- '99 9⁵ SE (LPT) - donated in '20
, Wed, 22 Dec 2021 15:53:42, Tue, 28 Dec 2021 14:05:18 <-- Viewing This Message, Tue, 28 Dec 2021 15:05:52
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