This check procedure applies to 1999 and earlier models. Due to the complexity of the electrical system on later models, the switch should be diagnosed by a dealer service department or other qualified auto repair facility. First, disable the airbag system. Next, remove the driver's knee bolster and steering column covers. Disconnect the ignition switch electrical connector located about six inches down the column from the ignition switch. Check the connector for continuity between the indicated terminals with the key in each position. If the continuity is not as specified, replace the switch. Additionally, check the ignition lock cylinder in each position to ensure it isn't worn or loose and that the key position corresponds to the markings on the housing; if the ignition lock cylinder is faulty, the entire steering column lock assembly will need to be replaced. To replace the switch, access it by following the initial steps to disconnect the electrical connector and remove the switch mounting screws. Install the new switch and harness. The ignition lock cylinder cannot be replaced by itself; the whole housing must be replaced. Remove the shear-head bolts retaining the ignition switch/ignition lock cylinder assembly and separate the bracket halves from the steering column, which can be done by drilling out the bolts and using a screw extractor. Finally, place the new switch assembly in position, install the new shear-head bolts, and tighten them until the heads snap off, ensuring to center the airbag clockspring before installing the steering wheel.
