Power lumbar not working in buick rainier

Question edited for clarity, 'Boss' with two s.
Question moved to model category.

Try this from the manual

https://ownersmanuals2.com/buick/rainier-2005-owners-manual-76905/page-176

and also

How do I change the time on my boss audio system?"
To display clock time, press and hold the CLK button on front panel. 2. To set clock time, press and hold the CLK button and the hour will 3. Press the or button or press the NEXT or PREV button to adjust the hour.

contents - Boss Audio

..

Hello, Before you tear out the seat motor, you might want to check the motor switch. If the switch is loose in the door panel, it might not be moving enough to make contact. Normally, motors do not heal themselves.

There is an eclectric release on the brake pedal do you hear a click when the vehicle is running and you apply the brake if not check fuses. If all fuses are ok then you will have to take the console apart there will be an electric switch on the shifter check for power going to it. If there is power replace switch if you have no power I would consult your dealer. Hope this helps.

might have issues with pressure plate, / or "if cable" adjustment of clutch cable, and if fluid type have the master cylinder checked might need replacement of the rubber kits hope this helps

It may be the switch is failing and needs to be replaced. However, it is not unusual for the motor moving the seat forward and back to jam on the running teeth attached to the seat. If, when you use the switch, you can either feel or hear the motor trying to run, then it is probably a mechanical problem under the seat. This can have a few causes - something on the teeth that should not be there, alignment of the motor to the teeth (maybe loose bolts), etc. If this is the case, the only way to troubleshoot this is to remove the bolts holding the seat frame to the floor, then using the motor move the seat as far back as it will go, then tip the seat forward and inspect the motor and gears underneath.

Looks like a common problem on lots of GM vehicles. You should watch this video before fixing your problem, which is in the
Secondary Air Injection System:

How to test an electric air pump P0410 case study

Could be one of several problems in the rear diff.
It depends if its the optional locking rear diff and it's stuck locked, or it is the limited slip and something inside caused it to lock.

See a mechanic before you do more damage.

Most probably the gear or cable broke.

oh thats the change oil light expect it every 3500 to 4500 miles they glow.. you can usually reset it by holding down the trip button with the car off and then turn the key to the II position where everything lights up
so read me >>>>>
Buick Rainier 2004-06, Buick Rendezvous 2002-05 w/o (DIC) Driver Information Center
Turn the ignition to ON without starting the engine. Fully press and release the accelerator pedal three time in five seconds. If the CHANGE OIL SOON’ indicator flashes two times, the system is resetting. Turn the key to OFF, then start the vehicle. If the CHANGE OIL SOON indicator comes on and stays on for five seconds, repeat the procedure.
Buick Rainier 2004-05 wI (DIC) Driver Information Center
The DIC display is located on the instrument panel cluster above the steering wheel. The DIG buttons are located on the steering wheel. Press button with the gas pump symbol to display engine oil life. Press button with the arrow symbol to reset engine oil life display.
Buick Rendezvous 2002-06 wI (DIC) Driver Information Center
To reset Service Reminder Indicator, turn ignition on with engine not running. Press the MODE button until DIC reads oil life left hold SET to reset. Press and hold the SET button until 100% is displayed. You will hear three chimes and the change oil message will go out. If the CHANGE ENGINE OIL’ message comes back on when the vehicle is started, the engine oil life system has not reset. Repeat the procedure.

woman with a hammer fixed 2004 Rainer! Had same problem. just tapped rear runners with hammer and it broke loose. Works fine now!!!
Hope it works for you.