there is a bad ground somewhere
A mis-wiring or short circuit somewhere between the controls, fusebox and lights.
because they do.
do you have an aftermarket security system installed in it?
a malfunction of the hard drive to send signals to the processor
it means that one of the indicator blubs have blu which causes them to flash quickly
Be sure the 4-way is turned off.
More than likely the Flasher Relay is bad. If the bulbs are lit but will not flash it is definitely the Relay. This can also indicate a bad bulb on one of the lights on the side that does not flash.
Usually this tells you that 1 or more lights are burnt out.
Answer You might want to check your flasher relay which is under the dash.
With it turned on, but not connected to anything please press in and hold the reset button for one minute. You will see the lights on the front of it flash. Let me know when that has completed. Please do not connect anything yet.
When a light bulb is turned off, the filament inside is still hot and continues to emit light for a brief moment before cooling down completely. This causes the light bulb to flash before going completely dark.
Why does my heater control lights flash on an off on my 1990 Z71