Lamp come on for 3 seconds than goes out.

This is both a courtesy and safety issue on many high end vehicles. The light from the interior lights can cast enough light to get to front door and possibly show dangers in your path. And after first getting into you car and starting it, you can check the back seat for any unwanted hitchhikers. As for the 10 minute timer, I don't know if this can be adjusted. A Chiltons/Haynes repair manual for you car may have that answer, or, the Buick dealership shop foreman. Best of luck.

are you talking Parking lights. all lamps work? cept one?
there are park(tail-running) blinker, brake, and fog.
my guess is side lamp means the actual car side parking lamps/.
there are huge numbers of lamps for park inside and out.
like 20, the inside lamps are DIMMable.
if all 20 odd lamps glow and one dont, it can only be.:
1: bad lamp.
2: bad socket to lamp
3: wires cut to said socket.
i use a thing called a voltmeter to see what part is bad.
got one,? $10 at walfart?

Many sets that use lamps do this right before the lamp fails--average life is 2000 hours or 2 years of normal use--if no blinking lights suspect the lamp first.

it sounds like you need a new lamp, this lamps are rated 6000-8000 life hours a life span of 2-3 years of use most of the time the problem comes from the lamp in this TV sets this is the lamp you need

http://cgi.ebay.com/ORIGINAL-HITACHI-UX21511-DLP-LAMP-REPLACEMENT-BULB-OEM-/120607006394?pt=LH_DefaultDomain_0&hash=item1c14bcdeba

How old is your tv and when was the lamp changed last? If its more than two years then you need to change the lamp. Its easy DIY. Buy lamp from reliable source or a known shop. check out rate for lamps on www.fixurtvs.com. thanks if you voted.

Lamps only last for 5,000 hrs -8,000 Playing hrs
It means every hour you Play TV Lamp burns up the hours, so after 5,000hrs on most Lamp needs replacing, some Lamps dont even last this long DLPs are not like Projection you can play them 24-7 and Tubes will remain good, But Lamps are like a light bulb they all burn out after so many hours.
Best thing is to turn TV off if you are not watching it, in order to Save Hours burt on Lamp.
Mats has Lamps for $99.00 1-800-628-1118
Replace the Lamp.

Those lights flashing mean the lamp is the issue. You need to test it with a meter. If the lamp tests ok then it may be the ballast is bad and that is what powers the lamp.

The interior lamps system consists of 2 main features. Illuminated entry and a battery saver feature that will turn the interior lights off after 20 minutes if they are left On with all doors closed and the ignition Off. The body control module (BCM) controls both of these functions. Battery power is supplied by the BCM through CKT 1732 to the following lamps:
• The dome lamp
• The map lamps
• The rear reading lamps
• The rear dome lamp
• The cargo lamp
• The glove compartment lamp
• The courtesy lamps
• The sunshade lamps
The BCM also controls the ground circuit side of the dome lamp and reading lamps for illuminated entry. The dome lamp and reading lamp will remain on for 20 seconds after the ignition key is removed and the last door is closed. In addition, if the vehicle is equipped with remote keyless entry (RKE), the dome and reading lamps will turn On and stay on for 20 seconds after an UNLOCK signal is received from the keyless entry transmitter.
The reading lamps, dome lamp and map lamps can be turned On at any time by moving the appropriate switch to the On position.
The rear dome lamp is fed battery voltage through CKT 1732 from the BCM, through the liftgate ajar switch, and is grounded through CKT 650 to the rear ground splice pack. The rear dome lamp will turn on when the liftgate is opened. The cargo lamp is fed battery voltage through CKT 1732 from the BCM, through CKT 744 and grounded through the decklid ajar switch.
The courtesy lamps are fed battery power through CKT 1732 and are grounded through CKT 745-- left front, CKT 747--left rear, CKT 748--right rear, CKT 746--right front. These circuits will ground through the door jamb switches. The courtesy lamp will be illuminated when the affected door is opened. For example, when the right rear door is opened, the right rear door courtesy lamp will turn on.

Not a fuse problem , if the BCM had blown fuse other thing's wouldn't be working as well . . Probably wiring or BCM . Using factory diagnostic,s instead of guessing as to what the problem is , is the proper way .

Interior Lamps Diagnosis
Symptom
Procedure
Important: Before proceeding with these diagnostics, check for DTCs. If DTCs are present, complete the associated diagnostics. If the condition still exists, return to this chart.
All of the interior lamps are inoperative when any door is opened.
Chart 1
The dome lamp is inoperative in the ON position, but OK in the door position. The map lamps operate normally.
The dome lamp switch is faulty. Replace the dome lamp switch.
The dome lamp is inoperative in the DOOR position, but is OK in the ON position.
Chart 2
The dome lamp is inoperative in any position and both reading lamps are inoperative.
Disconnect the dome lamp connector (BLK 3-way).
Check for voltage at terminal "C" CKT 1732 ORN wire.
If OK, the dome/map lamp is faulty. If no voltage is present, there is an OPEN in CKT 1732.
Either the right or the left sunshade mirror lamp is inoperative.
Chart 3
Either the right or the left rear reading lamp is inoperative in the ON or the DOOR position.
Chart 4
The rear reading lamp is inoperative in the ON or the DOOR position.
Chart 5
Battery rundown protection is shorted to ground - B1482.
B1482
The left rear reading lamp is inoperative in the ON or the DOOR position.
Chart 6

The lamps can do many odd things when they are on the way out includung the picture coming on and then dissapearing for a while then coming back. The lamps adverage life is 2000 hours, and at 3-5 years it is on borrowed time.