Servicing Guide: 2011 Hyundai Sonata

The 2011 Hyundai Sonata uses the new Hyundai high-security four-track lock system. All Hyundai high-security lock systems are based on the older Lexus system. The Hyundai system has 12 cuts, with six cuts located on each side of the key. All of the...


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An emergency release handle is located on the underside of the trunk lid trim and has to be removed before the trim will come free. The top of the handle has a plastic cover with a small slot located below the word “Pull.” Insert a small screwdriver into this slot and pry carefully to release the top of the cover to expose two mounting screws. After these two screws have been removed, the inner trim on the trunk lid will come free.

Once the trim has been removed, you will have free access to the trunk lock. The lock itself is secured to the trunk lid with two 10mm bolts. A bicycle style cable also connects the lock to the inside trunk release handle. After the two bolts and the cable have been released, the trunk lock will pull out easily.

When the lock has been removed from the vehicle, it can be disassembled and decoded. The tailpiece is held onto the rear of the plug with an E-clip like the one that was used on the door lock. Directly below the tailpiece is the return spring. As you remove the return spring, make sure that you take note of how it was wound around the end of the plug so you can replace it properly when you reassemble the lock. Once the facecap is out of the way, the lock plug will slide out of the housing easily. When the plug is free of the housing, you can decode it or rekey it just like the door lock.

 

Ignition Lock

The ignition lock is the hardest lock on the car to remove, and I do not recommend taking this lock out unless you absolutely have to. Hyundai designed the steering column shroud in such a way that the steering wheel must be removed in order to access any of the components inside the column. This means that you must disarm and remove the airbag before you can even see the lock retainer.

The first step in disarming the airbag is to disconnect the negative terminal of the battery. Whenever you disconnect a battery, always begin by disconnect the negative terminal. This is done for safety reasons. If you slip with your wrench and make contact with the body of the vehicle while you are disconnecting the negative terminal, you will not short out the battery like you would if you were disconnecting the positive terminal. Once the negative terminal has been disconnected and the cable isolated from the battery terminal, it will be safe to work on the airbag.

The airbag is held in place with three spring-loaded quick-release fittings. The springs allow the airbag module to move up and down slightly so that pressing in on the airbag module will blow the horn. Three small holes are located on the underside of the steering column, one at each corner of the triangular shaped airbag module. To release the airbag, insert a probe into each one of the holes in turn and press in on the small retainer at the end of the fitting. As you do this, the corners of the airbag module will pop out slightly.

After you have released all three corners of the airbag, it will come free of the steering wheel, and you will be able to see the ends of each fastener. The retainer that you depressed to release the fitting is located near the end of the shaft, and protrudes perpendicularly from the shaft. When you replace the airbag module, position each shaft inside its socket and then press down on the airbag. The three fasteners will lock back into position automatically when the airbag module is properly seated.

Two electrical cables are attached to the back of the airbag module. Each fitting uses a safety connection that automatically shorts the pins inside the connector as it is removed. This prevents any possibility of static electricity damaging or deploying the airbag. Each cable has a locking device that must be gently pulled up before the cable can be disconnected. In addition, each connector is color-coded to make the reassembly easier and safer.

After the cables have been disconnected, the airbag module can be removed and stored in a safe place while you service the ignition lock. When handling any airbag module, always keep your fingers and any small objects away from the electrical connections. In addition, when setting the airbag aside, always set it down with the upholstered side up.

After the airbag and the 22mm steering wheel nut have been removed, use a steering wheel puller in the normal fashion to remove the steering wheel. This will expose the two screws that secure the lower portion of the steering column shroud that were hidden by the steering wheel. The upper portion of the shroud clips into the lower portion and it can be lifted free simply by pulling up on it. The lower portion of the shroud is secured with the two screws in the front and one additional screw from below the column.

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