Principles of Operation

PRINCIPLES OF OPERATION

DM100i
When the audio unit is powered up, audio output signals are sent continuously to the speakers as a fluctuating AC voltage, thus producing sound from the speakers. The steering wheel controls are a multiplexed system that use different resistor values to produce different voltage levels on a single circuit. Each button that is pressed results in a unique voltage signal at the audio unit. This voltage signal is then interpreted by the audio unit as a distinct command. The audio unit is linked to the standard corporate protocol (SCP) communications network; therefore, trouble codes can be obtained with a diagnostic tool. The audio unit also has a self-diagnostic mode that can be entered by pressing preset buttons 3 and 6 simultaneously.

CDX6
When the audio unit is powered up, a wake-up signal is sent to the amplifiers. Audio output signals are then sent continuously to the subwoofer amplifier and audio unit amplifier. These signals are then amplified and sent to the speakers as a fluctuating AC voltage, thus producing sound from the speakers. The steering wheel controls are a multiplexed system that use different resistor values to produce different voltage levels on a single circuit. Each button that is pressed results in a unique voltage signal at the audio unit. This voltage signal is then interpreted by the audio unit as a distinct command. The audio unit is linked to the SCP communications network and; therefore, trouble codes can be obtained with a diagnostic tool. The audio unit also has a self-diagnostic mode that can be entered by pressing preset buttons 3 and 6 simultaneously.

Navigation
When the audio unit is powered up, a wake-up signal is sent to the amplifiers. Audio output signals are then sent continuously to the subwoofer amplifier and audio unit amplifier. These signals are then amplified and sent to the speakers as a fluctuating AC voltage, thus producing sound from the speakers. The steering wheel controls are a multiplexed system that use different resistor values to produce different voltage levels on a single circuit. Each button that is pressed results in a unique voltage signal at the audio unit. This voltage signal is then interpreted by the audio unit as a distinct command.

The navigation audio unit is responsible for generating the displays shown on the video screen display by using video circuits (color generation and display synchronization) between the navigation audio unit and video screen. When an on-screen menu key is pressed on the video screen display, a signal is sent to the navigation audio unit through the controller area network (CAN) circuits. Refreshed data is then sent through the video circuits, and a new screen is displayed corresponding to which key was pressed. Diagnostic communication between the navigation audio unit and the video screen display takes place over the CAN circuits. Refer to Navigation System for further information about the navigation system.