Component Tests and General Diagnostics

Steering Column Switches

Component Tests

Ignition Switch - Mechanical

The following conditions can cause difficulty in operating the ignition switch and lock cylinder:

- Burrs on the lock cylinder key
- Insufficient lube on the lock cylinder
- Binding lock cylinder
- Burrs or foreign material around the rack and pinion actuator in the lock cylinder housing
- Insufficient lube on the actuator (Do not apply lubricant to the inside of the ignition switch.)
- Binding ignition switch

For steering columns equipped with a steering column lock, the lock should engage and prevent steering wheel rotation in either direction. When locked, it may be necessary to apply turning effort to the wheel in one direction or other to allow the key to turn. This normally occurs when the wheels are contacting a curb or similar object and is a normal trait of the system.

Perform the following test to determine if the ignition switch and lock cylinder are operating correctly.

1. Inspect the ignition key for any burrs, damage or incorrect cut. Replace the ignition key as necessary.

2. For steering columns equipped with a steering column lock. Check the steering column lock operation. Do this by turning the ignition key to the OFF position and rotating the steering wheel to the left of center. The column should lock within approximately 15 degrees. Repeat turning the wheel to the right of center. If the column fails to lock on either side of center the column lock will require inspection.

3. Turn the key through each position. There should be no binding or roughness and the key should automatically return from START/RUN when released. If binding, roughness or other concern is felt while rotating the key in either direction remove the lock cylinder to determine if the lock cylinder or the ignition switch is causing the concern. Continue with Step 4. For lock cylinder removal procedure refer to Handles, Locks, Latches and Entry Systems Service and Repair.

4. Rotate the ignition lock cylinder through all of the switch positions.
- If the lock cylinder operates correctly, continue with Step 5.

- If the lock cylinder does not operate correctly, install a new ignition lock cylinder. Refer to Handles, Locks, Latches and Entry Systems Service and Repair.

5. Check for binding or sticking ignition switch actuating rod, burrs around the rack-and-pinion actuator in the ignition lock cylinder housing or insufficient lubrication.
- If there is sufficient lubrication and there are no burrs, binding or sticking conditions, install a new ignition switch. Refer to Ignition Switch Ignition Switch.

- If there is insufficient lubrication, burrs, binding or sticking conditions, repair or lubricate as necessary.