Several different types of steering wheels are used on GM W-Body vehicles, depending on model year, trim level and options. Many steering wheels will have remote radio switches (also called redundant radio switches) built into the steering wheels. Cruise control switches as well as horn and air bag functions are all built into the steering wheel.
One important component just under the steering wheel is the SIR coil. Since so many wires run to the face of the steering wheel including the all-important air bag connections, a special wiring device called the SIR coil is used to allow the steering wheel to turn freely yet, still provide reliable wiring connections through a "ribbon cable" arrangement. Care must be used to always center the front wheels and lock the steering column when working on the steering wheel and related components. The SIR coil assembly will become "uncentered" if:
REMOVAL & INSTALLATION
- Center the front wheels and lock the steering column. Remove the key from the ignition.
- Disable the SIR (air bag) system. Please see the procedure in .
Remove the air bag module from the steering wheel using the following procedure:
- Verify that the SIR system has been disabled.
- On the back side of the steering wheel, locate and remove the air bag fasteners.
- Gently pull on the air bag module to free it from the steering wheel.
- Detach the electrical connections from the steering wheel to the air bag module.
- Place the air bag in a safe place, with the trim pad facing upwards.
- Scribe an alignment mark on the steering wheel hub in line with the existing mark on the steering shaft.
- Loosen, but do not remove the steering wheel shaft nut, positioning it flush with the end of the steering column shaft. This is protect the steering column shaft threads from the foot of the steering wheel puller center screw.
- Assemble a suitable steering wheel puller (GM recommends their J 1859-A puller with J 36541 special legs) to the steering wheel and pull the wheel loose from the shaft.
- Remove the steering wheel shaft nut and the remove the steering wheel. Detach the electrical connectors.
- Route the SIR connector through the steering wheel.
- Align the scribe mark on the steering wheel made at removal with the existing mark on the steering column shaft. Make sure the steering wheel is seated.
- Install the steering wheel shaft nut and tighten to 33 ft. lbs. (45 Nm).
Install the air bag module using the following procedure:
- Attach the electrical connections to the air bag module.
- If equipped with leaf-spring type clips, line up the air bag module retainers with the openings in the steering wheel. Gently press the air bag module into place until it 'snaps' into place.
- If equipped with screws to retain the air bag, install the screws using care to line up the screw openings.
- Enable the SIR system. Please see the procedure in .
- Check the operation of the horn and steering wheel. Check the operation of the steering wheel switches, as equipped.