Not sure if it's a separate part back in '89, but on the '93, it's called a combination relay...a fairly large relay as it encompasses the hazards, turn signals, and intermittent wiper operation. More expensive than an ordinary flasher as a result.

Should be located near the fuse panel in the engine compartment.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car