How do i replace the rear turn signal bulb on a 1998 buick lesabre?

Check the wiring to the bulb. There may be a broke wire shorting out.

Gday mate, we had a problem with another late model vehicle similar to that, the bulb that was put into the reverse light was not exact brand product ( ohmage was slightly wrong ) and fowled up computer, correct bulb in place and disconnect battery to reset K A M ( keep alive memory) problem solved, BEWARE, some vehicles cannot have KAM reset except for dealer computer tethered reboot , just try putting the factory correct bulb(s) in and see how it goes, geoff. hope this helped.

There is either an excess panel behind the lights in the trunk, you take off the cover and the lamp holder and replace the bulb. However on some GM cars the taillights assembly has to be removed to gain access to the bulbs. Buick used both methods over the years.

Typically you should be able to open the trunk and pull the liner from the very back of the trunk to access the tail lights.

the battery is in the engine compartment, should be on front passengerside, the signal is done from under the rear of the front lamp.

OPen the trunk and remove the access cover. The bulbs just twist out from the rear.

2 fuses, for park lamps, 6C 25 amp and 8C 10 amp

most likely a bulb. you should be able to get to it.

i had this same problem and i alleviated it by replacing the column switch which isnt an easy task and I used a manual (which can be obtained at the library for free or you can buy one at your loccal book or auto parts shop)

I think you have to open the trunk, lift the carpet back and there should be things that look like plastic knobs that have the bulb inside them, Should be 1157 or so bulbs.