How do i reset the tir sensor? I tried to reset by using the check mark. i do not have a service manuel. I have waited till the horn re

If using the driver information center/dic, press and release info button until tire learn message is indicated.Depress and hold set/reset button until two horn chirps are sounded indicating learn mode has been activated, front left turn signal will be illuminated. Starting at the left front tire, increase/decrease the air pressure for 8 to 10 seconds and wait for the horn chirp. It may take 30 seconds for the horn to chirp. When horn chirp has sounded the sensor information is learned, then the turn signal for next location will be illuminated and so on. When all sensors have learned the horn will double chirp. Turn key to off position to exit learn mode. Adjust all tire pressures to recommended pressures. System will complete calibration process as vehicle is driven.
Knowing the model would help, the info above covers several chevy models, but, not all.

I think you mean either ABS or SRS.
ABS refers to the braking system so this would need investigation....I.e.check brake fluid reservoir and for signs of leaks round brake pipes and wear on pads.
SRS supplemental restraint system...usually airbag warning light. They should go out after 5 seconds on start.sometime they can be reset by using various techniques like leaving the driver door open...turning the ignition on but not starting the car... Then pressing the door light switch button on bottom of driver door opening 5 or 6 or 7 times and turning off ignition All within 10 seconds.(you may need to experiment with this number )always hold the door light button in on last count whilst turning ignition off.then close door restart car.wait 5-7 seconds then it will reset unless there is actually a problem with airbag.this can occur when you disconnect battery or replace battery.the interruption can
alter airbags sensor.also some sensors are housed in the horn component of car horn and the spring on horn can interfere with the sensors normal operation.So did you recently remove battery or use horn excessively ?finally if it is an airbag fault and the light remains on it may mean your airbag will not deploy and your seat belts won't lock in a collision scenario.best in that event to get to a garage.if thus is of help please vote thank you.

My work van is a e-series 2011 cargo / work van, the way to reset the tire pressure on it is too push the hazard lights button a few times, may 5 or 6 times pretty quickly when the van is in park and running, the horn will honk and and then you stop pushing the hazard button and wait for a few minutes and the horn will honk agian and the tire pressure light will go out, i dont know if this resets the tires pressure sensor, but the light on the dash goes out, on my van it comes back on after i restart the van , so I am guessing that the sensor on my van is bad. but its worth a shot on your car.

2 ways turn key on till the acc position remove plastic cover edge of the dash past air vent on drivers side theres a red reset buton hold it till resets n it also resets lower tir pressure monitor light if that comes on .... n u can turn key to all accessories comes n soon u turen the key press gas pedal to the floor n release 3 times

If you have a factory remote and the owners manuel there is a solution in the manuel. It tells you how long to hold down the lock button on the remote to reset it so the horn toots when you lock the doors. I do believe it to be 2 seconds or more. So you would lock the doors using the remote and don't let go of the button for at least 2 seconds. Hope this helped.

put park brake on, turn ignition key to on position (no start) turn parklights off and on 4 times quickly (horn should sound twice). If you have or can get a TPMS activation reset tool great. Starting at drivers front, then passenger front, then passenger rear, then drivers rear. if you do not have a reset tool then you can try following method. Take valve caps off of all tires, start at drivers front tire (front left) let out 2 to 3 psi of air, about 5 seconds (TPS will detect this) wait about 10 to 15 seconds for horn to sound proceed to passenger front (front right) and repeat process, proceed to passenger rear and repeat process, proceed to drivers rear and repeat process. If horn does not sound than you will have to turn ignition key off and start over. You may have to re-inflate tires, it took me 2 days of @#$&^# around to get this method to work first time. God help you if a sensor is bad or missing.

is it just a dummy light on the dash or is it more specific like L.F tire low,ect? if its a dummy light then you need to go to a garage with a tire pressure monitor service to to check to see if the batteries in the monitors are still good or if you are just dealing with a leaking tire. If you Tahoe uses wheel speed sensors to monitor tires and pressure you may have a faulty wheel speed sensor or a heads up that your wheel bearing is wearing and the gap between the tone ring and sensor have increase or decreased good luck

lock the car using the key to reset the alarm

Take it to your local trustworthy mechanic. They have a nifty little gadget called a code sensor and they plug it into your car and turn the light off. It takes about 2 seconds. MOST mechanics will do this free of charge, especially one that you frequent. It's a simple thing. You can buy a code sensor online OR at a parts store, but they aren't cheap and don't always work if you don't know how to use it. I suggest calling a few mechanics and finding a nice one that will reset your light for free.
Good Luck.
As for the horn, it's probably a fuse.