Steering Wheel Controls

The steering wheel HVAC/radio controls consist of two components:
- Steering wheel HVAC/radio switch
- SIR Coil Assembly

Steering Wheel HVAC/radio Switches
The steering wheel switches control various functions of the HVAC and/or Radio. These switches are actually a ladder network consisting of the switches and a series of resistors. The ladder network is arranged so that each switch has a different resistance. This allows a different voltage output to the HVAC or radio for each switch pressed.

Sir Coil Assembly
The SIR coil assembly contains four wires used by the steering wheel controls. This allows voltages to be sent the steering wheel switches to the HVAC or radio while the steering wheel is being turned.