Don't know where the convenience "relay" is, probably the same place as the sedan (under the rear seat), but lacking a manual, who knows?

Is the switch in the housing where the overhead light is like it is on the W124? If so, just pull it (as if changing a lamp) and you should be able to figure it out.

If it's not the switch or fuse, hope it's the motor, not the relay. No replaceable parts in the "relay", just the whole box.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!