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Volvo Maintenance Hints for 7xx/9xx - Bill Garland's Nuclear ...

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Seat Electricals:<br />

Interior: Seats, Etc. FAQ Home<br />

<strong>Volvo</strong> <strong>Maintenance</strong> FAQ <strong>for</strong> <strong>7xx</strong>/<strong>9xx</strong>/90 Cars Version 7.5<br />

Seat Electricals:<br />

Seat Heater Functional Diagnosis<br />

Seat Heaters Over-Heat<br />

Seat Heater Switches<br />

Power Seat Diagnostic Trouble Codes<br />

Power Seat Motor Failure<br />

Power Seat Switch Cluster Removal and<br />

Repair<br />

Power Seat Switch Repair<br />

Seat Mechanicals:<br />

Seats Interchangeable?<br />

Squeak in Wagon Seats<br />

Seat Removal<br />

Seat Tracks<br />

Seat Back Removal<br />

Lumbar Support Repair<br />

Front Seat Bottom Foam Replacement<br />

Seat Pocket Mount Repair<br />

More Headroom Via Lower Seat Cushion<br />

Headrest Removal<br />

Seat Covers:<br />

Vinyl Repair<br />

Leather Seat Repair<br />

Seat Cover Sources<br />

Seat Map Pocket Repair<br />

Upgrade:<br />

Third Seat Installation<br />

Installing Power Seats in a Manual Seat Car<br />

Seat Heater Functional Diagnosis.<br />

Basic Troublsehooting:<br />

How to troubleshoot the seat heaters:<br />

1. Are fuses good?<br />

2. Check seat heater switches to ensure they are good and the lamps light up. Contacts may require cleaning, since they are<br />

in an area that accumulates dirt and debris.<br />

3. If your car has leather seats, it will have a relay. Cars with cloth seats (probably only GL and base models) may lack a<br />

relay and have the thermostat direct in line with the heater elements. The relay may have come loose, or it may suffer from<br />

internal solder breaks. Remove, re-solder, and reinstall.<br />

4. Remove seat cover and trace continuity on seat heater harness. Sometimes the connectors to the thermostat break,<br />

sometimes the wires to the element break right at the edge of the element. There are often breaks in the harness that<br />

develop over the years. It seems to be much more common to have a problem with the wiring than with the thermostat. I've<br />

found the connection often becomes loose right at the thermostat--I actually resorted to soldering one thermostat in place-no<br />

more problems! Repair breaks with soldering. Simple way to test the thermostat is to check continuity after placing the<br />

'stat in the refrigerator <strong>for</strong> awhile.<br />

5. If Steps 3 or 4 show the seat heater to be ready <strong>for</strong> retirement, replace with a new seat heater. Cost will be around $100.<br />

Repeat process whenever seat heater malfunctions, or every five years, whichever comes first. (Seat heaters commonly<br />

start to fail around the five-year mark).

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