My security light is staying on in my 2004 Buick century what does it mean and how do I reset it

SOURCE: security light stays on

First place to check would be a fuse.  See if there is one labled security or alarm.  If there is try changing that.

SOURCE: buick century 2000 wipers

I found the following description on the web, this covers a bunch of the questions I was going to ask...

I own a 2000 Silo and wondered the same thing and do see some GM vans with this problem.

When I bought mine I also bought the Haynes Repair manual (1997 thru 2001 all models GM) #38036 to learn how to fix this and a LOT of other components in/on the van.

For $20 it's worth it.

To answer your question: If the wipers stop at the position they're in when the switch is turned off (Fail to park), disconnect the multi-function switch electrical connector. (This is located under the dash next to the firewall and steering column)

If the wipers now park, replace the multi-function switch. If the wipers still do NOT park, check the wiring from the wiper motor to the switch for a short circuit. If the circuits are good, replace the wiper motor.

Note: There are other adjustments needed for proper operation than just bolting and new motor on.

You can have a look at this manual at any automotive parts supply store.

SOURCE: how to replace a coolant level sensor, 2000 buick century

The coolant level sensor is located on the radiator. If you are looking at the engine from the front of the car it will be on the left side. There will some kind of clip holding it in the radiator. Removed the clip and pull the sensor out. You will lose coolant so try to swap it out quick or drain some of the coolant out. Once new sensor is installed, install clip to keep the sensor in place and reconnect the wires to the sensor. Crank the engine and make sure the coolant level is full. This should correct your problem.

SOURCE: Buick Century 2003 service engine soon light

My service engine light was caused by a cloged passage from my EGR valve. Mine is a 3.1 with fuel injection 2003. All I needed to do was pull the two bolts over the intake plenum and remove the vacuum connection to the PCV valve. Then clean out the EGR port just below the vacuum connection in the throttle port. I would remove the rubber intake to vacuum it out. The carbon was like rock in there. Service engine light cleared on its own.
Dave

SOURCE: reset the oil change light

engine off turn key to run. Fully press and release the gas pedal slowly three times within five seconds. If light flashes, system is resetting. Turn key off, start engine, if light comes back on repeat.