It is quite simple to replace the turn signal switch on your 1990 Buick LeSabre. The turn signal switch simply plugs in and out.
This varies with model year.
Because its a 1988 Buick LeSabre
yes.under left side of dash
Bulbs or turn signal flasher, maybe even the switch.
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replace the combination switch on the turn signal stalk
Could be a burnt out bulb or a bad flasher unit.
More than likely the Flasher Relay is bad.
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Easy. There is no Buick LeSabre "Deluxe".
Amazingkeys.com has the 2000 Buick LeSabre Key. It does have the chip in it.
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