How are electrical ignition switch issues diagnosed?
Because ignition switch problems are rare, a mechanic will typically check several other components before assuming it's the culprit.
First, fuses and relays will be looked at. Then the starting and charging system may be checked, depending on the symptoms. If the other components of the starting and charging system are functioning properly, the ignition switch will likely be suspected.
To check the switch, the technician will test voltages as the switch is moved to various positions. If it's not working as it should be, the switch will be replaced.
How is an electrical ignition switch replaced?
If the ignition switch and ignition lock cylinder are one component, replacing the switch will be very difficult if lock cylinder fails.
If the lock cylinder works properly, the ignition switch is generally not too hard to remove. In most cases, the steering column plastic covers will be removed, and the lock cylinder will be turned and released. The ignition switch can then be taken out, after removing any obstructing or retaining hardware.
Once the ignition switch is removed, a final bench test may be conducted to make sure it's the problem. The new switch will be installed and the lock cylinder will be put back in place.
What to look out for when dealing with electrical ignition switch issues
Replacing the ignition switch does not normally require replacement of the ignition switch lock cylinder, so the same key is normally used. If the lock cylinder is replaced, the ignition key will change as well.
Can I replace the electrical ignition switch myself?
The ignition switch is typically not a DIY job. Newer ignition switches have more advanced security systems and are more difficult to access or remove. With most modern vehicles, it's best to take it to a technician.
