Land Rover Discovery: Video System - Operation

TELEVISION

The television system has various levels of user control through the Touch Screen (TS) and the left steering wheel switchpack. The system includes 6 analogue and 12 digital channel pre-sets. As with the audio system, the user can tune up or down through the channels and store a channel by a long press of the selected preset switch. The system offers a choice of screen aspect ratios.

The television system is primarily controlled from the TS and also the left steering wheel switchpack. Control signals from the TS are sent on the Media Oriented System Transport (MOST) ring to the TVCM. The TVCM uses a dedicated Composite Video Baseband Signal (CVBS) bus to transmit video signals to the TS. Where RSE is fitted, the TV can also be controlled using the RSE remote control and the video output will be delivered to the RSECM via an Low-Voltage Differential Signalling (LVDS) video link. The TV video feed is then forwarded on to the TS from the RSECM via a CVBS output.

Control signals from the left steering wheel switchpack are relayed via a Local Interconnect Network (LIN) to the Central Junction Box (CJB) and on the medium speed CAN chassis systems bus to the TS. The TS relays the control signals to the TVCM on the MOST ring. The TS is the bus master for the MOST ring and also hosts a gateway function between the medium speed CAN bus and the MOST ring.

The TVCM audio output signals are sent on the MOST ring to the Audio Amplifier Module (AAM) for speaker output.

REAR SEAT ENTERTAINMENT

The RSECM is connected directly to both rear RSE screens via a private medium speed CAN link and a Low-Voltage Differential Signaling (LVDS) connection. Infra-red signals from the RSE remote control are received by the RSE screens and user requests are communicated via a private medium speed CAN link to the RSECM. Video signals are communicated via the LVDS to one or both screens as requested.

The RSE control module communicates with the audio system via the MOST connection. Audio input from the Audio Video Input/Output (AVIO) panel is processed by the RSECM and passed on the MOST ring to the AAM to allow audio output to be played on the vehicle speakers or on the wireless headphones.

Video input from the TVCM and the AVIO panel is also processed by the RSECM and passed to the two RSE screens on a LVDS connection. The TV Video is also passed to the TS on CVBS connection. The RSECM also controls the power supplies to the RSE screens and relays the infra-red RSE remote control signals received by the RSE screen infra-red sensors. The infra-red signals are passed from the RSE screens to the RSE control module on a local medium speed CAN bus system.

A time limit operation is active when the ignition is off and the vehicle is unlocked (Power mode 4) and the system is manually switched on using the TS. The system will operate for a maximum of ten minutes. The battery voltage is continually monitored by the IAM. If the IAM detects that the battery voltage has fallen to a predetermined level, the IAM will shut the infotainment system down to prevent further battery drain. Once the system has shut down due to low battery voltage, it can only be restarted when the engine is running and the battery voltage has risen above the threshold level for more than one minute.

CONTROL DIAGRAM

NOTE:

A = Hardwired; I - Composite Video Baseband Signal (CVBS); P = Media Oriented System Transport (MOST); U = Medium speed private CAN bus; AE = Low-Voltage Differential Signalling (LVDS); AG = Infra Red

1. Rear Seat Entertainment Control Module (RSECM)
2. Audio Amplifier Module (AAM)
3. Televison Control Module (TVCM)
4. Touch Screen (TS)
5. Integrated Audio Module (IAM)
6. Left Rear Seat Entertainment (RSE) screen
7. Right RSE screen
8. RSE remote control
9. Ground
10. Relay - located in Quiescent Current Control Module (QCCM)
11. Fuse - located in QCCM
12. Audio Visual Input/Output (AVIO) panel
13. Headphone transmitter
14. Headphones

Video Display (G1519956) Removal and Installation

REMOVAL

NOTES:

• Some variation in the illustration may occur, but the essential information is always correct.
• Some components shown removed for clarity.
• Removal steps in this procedure may contain installation details.

INSTALLATION

1. To install, reverse the removal procedure.

Portable Audio Interface PanelVoice Control

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