Steering Wheel Controls

CIRCUIT OPERATION

Switch and Electronics Module
The Switch and Electronics Module controls the Radio by creating voltage pulses that correspond to different radio control functions. These signals are sent to the optical receiver/transmitters in the Cancel Cam Assembly. The Switch and Electronics Module also receives data line signals via the Cancel Cam Assembly. The signals received by the Switch and Electronics Module are used to determine when the data line is free of other signals so it may transmit.

The Switch and Electronics Module receives power, illumination power, and ground via slip rings between the Turn-Hazard Signal Switch Assembly and the Cancel Cam Assembly.

Cancel Cam Assembly
The Cancel Cam Assembly includes five solid state infrared transmitter/receiver units. These units along with two identical units in the Turn-Hazard Switch Assembly are used to send optical signals between the steering wheel and steering column. The optical units are arranged so they are always in sight of each other and thus form an optical slip ring. The Cancel Cam Assembly incorporates circuitry which changes the signals from optical to electrical and vice-versa. The Cancel Cam Assembly receives power, ground and illumination power through 3 of its 4 slip rings from the Turn-Hazard Switch Assembly brush contacts. The horn signal is sent through the fourth slip ring.

Turn-Hazard Switch Assembly
The Turn-Hazard Switch Assembly receives optical signals from the Cancel Cam Assembly and converts them to electrical signals that are sent to the Translator Module. It also receives electrical signals from the Translator Module and converts them to optical signals that are sent to the Cancel Cam Assembly. The Turn-Hazard Switch Assembly sends power to the Cancel Cam Assembly through its brush contacts.

Translator Module
The Translator Module receives electrical voltage pulses from the Turn-Hazard Switch Assembly and sends these signals to the Radio/Clock over the serial data line. The Radio responds to these voltage pulses by adjusting its operation accordingly. The Translator Module is used to shape the signal pulse, to separate the send and receive pulses, and to convert from a one to a two wire data line.