Seatback Display Electrical Interface with Radio DVD Player

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

The Seatback display module will receive a video signal from the radio head unit. The left side (driver) Seatback display will receive a video signal from the radio display 1 video output. The right side (passenger) Seatback display will receive a video signal from the radio display 2 video output.

The video source sent from the radio to the video screens will be controlled via the source button on the remote control or the radio.

The Radio DVD player/Rear Seat Audio System interfaces to the display through the following:

Composite Video Signals
NTSC and PAL video formats are supported.
Left and Right Audio Signals
PWM signal for Brightness Control.
- The brightness control is used to provide the screen brightness signal to the seatback displays.
- Each of the two seatback displays per vehicle share a common brightness control line from the radio
- The pulse width modulated (PWM) brightness control is provided by the radio over a single wire, using ground as the return.
PWM signal for Mode Control.
- The mode control is used to control video screen display options, in support of providing different screen sizes, zoom, picture inversion and backlighting.
- Each of the two seatback displays per vehicle share a unique mode control signal from the radio.
- The PWM mode control is provided by the radio over a single wire, using ground as the return.
Power Enable Signal.
The power enable signal is used to activate the DVD displays.

The 2 Seatback Displays interface to the Radio DVD player through the following:

IR remote data carried on a twisted wire pair. The IR remote data circuits from left and right seatback displays are spliced together within wiring harness.