Ignition is locked, recently changed battery & now can not start truck. tried reseting alarm by unhooking battery, turned steering wheel also played w/ gear shifter to no avail. 2002 avalanche

Try this Instructions

1. • 1Press the "Unlock" button on the remote keyless entry device.
   • 2 Insert the key into the ignition. Turn the ignition switch to "ON" without starting the engine.
     
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   • 3 Press and hold the valet/override button below the steering column within five seconds of turning the ignition on.
     
   • 4 Release the valet/override button when the security light on the instrument panel stops blinking. The alarm is reset and disabled.
     

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Put key in ignition and turn forward to start electrical system, but not the engine.
Turn key back one click.
Push the button on the alarm box under the steering wheel (sometimes by parking break) three times (3x)
You will hear two beeps of the horn confirming the change. You are done.

The steering lock may be binding the ignition lock cyl preventing the key from turning or the key may be worn out. Try turning the steering wheel back and forth while wiggling and turning the ignition key. To get the alarm to turn off without starting the car try locking and unlocking the vehicle from the passenger side door. There is a micro switch on the drivers side door lock cyl that may be bad and preventing the alarm from dis arming. This is all providing it is a toyota factory alarm sys.

Yup, the alarm module is usually located under the steering wheel in the dash (it splices into the ignition and wires in the steering wheel) thats where they would have removed the alarm module. Check for broken or unconnected wires under the drivers side dash under the steering wheel. loose broken wires should be able to see. make sure to feel for wires "tucked up in there." You can also try getting a new/used combination switch from parts department or junk yard (turn signal switch and/or hazard switch ) and seeing if replacing that works.

put the key in the ignition push the lock button on your keyfob, pull the key out while holding down the lock button and press the unlock button 5 times. check the battery in the key if it has a built in fob.

Ignition Switch Removal & Installation To Remove:

1. Remove the steering column trim covers.
2. Remove the wire harness from the retainers as needed.
3. Slide the 2 connectors of the multifunction switch assembly out from the bulk head connector.
4. Detach the key alarm connector from the lock assembly.
5. Remove the ignition switch mounting screws and the ignition switch from the steering column.

Ignition switch removal/installation

To Install:

1. Install the ignition switch on the lock module.
   • Tighten the screws to 42 lb in (4.7 Nm).
2. Install the key alarm connector on the lock module.
3. Slide the turn signal and multifunction switch connectors into the bulkhead connector.
4. Install the harness in the original retainers.
5. Install the steering column trim covers.

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Ignition Lock Cylinder Removal & Installation To Remove:

1. Disconnect the negative cable from the battery.
2. Disable the supplemental inflatable restraint (SIR) system.
3. Remove the steering column trim covers.
4. Turn the ignition lock cylinder to the run position.
5. Using an awl with a bent tip, insert the tip into the access hole of the ignition lock cylinder.
6. Turn the lock cylinder to start and push down and hold the lock cylinder retaining pin.
7. Release the lock cylinder to the run position and withdraw the cylinder from the steering column.

Ignition lock cylinder removal

To Install:

1. Align the slot in the steering column to the tab on the lock cylinder and install the lock cylinder until it locks in place.
2. Install the steering column trim covers
3. Connect the negative cable to the battery
4. Check for correct operation

on that year car when the ignition is turned off a pin moves thru a gear with openings under the steering wheel. if the alignment is off the pin will strike the gear and stop you from turning off the car. If i am right you may be able to move the steering wheel as you try to turn off the ignition and get that pin to hit an opening in the gear. If not then something is wrong with the switch or the key has worn out and the lock cylinder is not releasing all the stops which let it turn meaning you will have to replace the lock cylinder. This requires pulling the steering wheel to gain access to the lock. If you need to do this reply and I can walk you thru the process but you will need to get or rent a steering wheel puller kit to do it. hope this helps if so please reply and good luck

Try wiggling the streering wheel left & right while turning the key, sometimes pressure on the steering linkage will keep the key from turning.

try unhooking battery cable. hook back up and use key remote to unlock car and try to start if no remote use key to unlock

under the steering column, there are three or four little holes in the plastic covering. If you look inside, one of them (the one on the right side toward the dash) there is a brass pin inside. This is the pin to release the key. As far as the key not turning, I have had the same problem. The first time I replaced the ignition switch and that solved the problem. However, this makes no sense because the ignition switch has nothing to do with the tumbler being locked. GMC thinks that my anti theft system, which is inside the ignition cylinder is the problem. By removing the ignition switch, it reset the pass lock anti-theft system and temporarily fixed the problem. So, try removing the ignition switch and then plugging it back in. If that doesn't work, your in the same boat as I am, and we may both need new ignition cylinders.