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Howdy,
The drawing I have is for a 1985 but it shows power coming from fuse 11, not 13. You might want to make sure where it gets power.
Regardless, if the pilot lamp comes on with the switch, you've got power. Check for power at the connector for the driver's seat. Also check for a good ground on the wire coming from the passenger seat. Check the connector at the back of the seats that joins the two heating elements together. Three connectors total; power, interconnect, ground.
On the driver's side heating element there is a thermostat. It is in series with the heating elements. It opens when it reaches a temperature of 93ºF. It comes on again at 57ºF. It may be open all the time now. I don't know how it is installed (I've never seen one). If you can, install a temporary jumper to bypass it. Got heat? There's your problem.
Also see this page on Swedish Bricks:
http://www.swedishbricks.net/faq/interior.html
Almost at the bottom is this little jewel:
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u may recall some months or so ago I was looking for an alternate source for the rather pricey Volvo seat heater thermostats. I discovered Volvo OEMs from Elmwood Sensors, Pawtucket, RI their model 2450 button thermostats rated for open at set point ~90-97 degrees F. But Elmwood would only sell to me in quantities of hundreds... I don't own that many Volvos!
anyway found a reasonably priced 2nd source who offers an exact replacement part IMHO of higher quality then the Elmwood part.
Selco Products
7580 Stage Road
Buena Park, CA 90621
1 800 229 2332
1 800 257 3526 (order #)
They advertise in NASA Tech Briefs magazine. I've tried their stock 1/2 inch disc thermos model OA, they match all the physical and electrical characteristics of the Elmwood and are available in temp increments of 10 degrees. I tried a few different models between 90 to 120 and found that open at 110 deg F temp to be much more comfortable heat thru the sheepskin covers I have on my 240s, your mileage may vary. specify your choice temp range for the OA model and ask for thermos _without_ bracket so they fit the mounting holder in the lower seat heater pad.
Mike
'84 264 diesel M46 259,xxx miles
'81 245 petrol M46 248,xxx miles
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I found them on the WWW: http://www.selcoproducts.com/
Good luck and let us know the outcome.
--
Mr. Shannon DeWolfe -- (I've taken to using Mr. because my name tends to mislead folks on the WWW. I am a 51 year old fat man ;-) -- KD5QBL
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