Circuit/System Description
The radio supplies 10 volts to the steering wheel control momentary contact switches and monitors the return signal. Each switch is associated to a set resistance value, when pressed a specific voltage drop occurs through a series of resistors unique to that switch. The radio then identifies the switch selected to activate the feature, otherwise sends a serial data message received by the controlled component activating the feature.
Steering Wheel Controls Description and Operation
The audio steering wheel control switches duplicate the function of the primary controls of the associated component, through a network of multiple momentary contact switches and a series of resistors. The radio supplies voltage to the switches and monitors the return signal for a specific voltage drop to occur unique to the one pressed. The radio then identifies the switch selected to activate the feature, otherwise sends a serial data message that is received by the component controlled, activating the feature.
This information is intended to diagnosis the circuits between the radio and the audio steering wheel control switches. If the primary control for the device is inoperative, refer to the appropriate information for the component the steering wheel control switch is functioning.
Steering Wheel and Column Description and Operation
The steering wheel and column has 4 primary functions
- Vehicle steering
- Vehicle security
- Driver convenience
- Driver safety