Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Telematics / Operation

The Telematics Control Module (TCU) receives the Global System for Mobile communications (GSM) and Global Positioning System (GPS) signals. Signal reception is via roof pod which contains the GPS and GSM antennas.

The GPS signal is received by the antenna and is passed to the GPS signal splitter. The GPS output from the GPS signal splitter is sent to the TCU for telematics system use and to the Integrated Audio Module (IAM) for navigation use.

The GSM signal is received by the roof pod. The signal is passed by a coaxial cable directly to the TCU. In the event of a malfunction of the roof pod, the backup GSM antenna within the TCU will also receive the GSM signal.

The GSM signal provided by Vodafone enables the TCU to communicate with the Telematics Service Provider (TSP) Wireless Car. The TSP provides secure mobile data connection and co-ordinates the sending and receiving of vehicle data and control commands. Telematics provides two main services; vehicle and driver.

The Land Rover InControl system includes vehicle services; Breakdown call (bCall), Emergency call (eCall) and stolen vehicle tracking. Driver services include mobile phone applications with remote vehicle functions.

Several third party suppliers are integral to the InControl system. In each market emergency response agencies are integrated with InControl along with Land Rover Assistance and Stolen Vehicle Tracking.

A dedicated smart phone application and the InControl owner website are available to provide an intuitive and secure interface for InControl users. An administration website is available for dealerships to set up and manage customer accounts.

The TCU receives the following inputs:

  • Hardwired and CAN crash signal from the Restraints Control Module (RCM) - automatic e-Call activation.
  • eCall/bCall switch activation signals
  • Microphone signal
  • Roof pod or telematics antenna GSM and GPS signals.

The TCU provides the following outputs:

  • Telematics speaker.

Communication with the vehicle systems is via the MultiCAN buses, enabling remote vehicle feature functions. The following TCU primary communications transmit data on the following MultiCAN buses:

  • Engine immobilisation start request ID - Telematics Control Module to Central Junction Box - High speed CAN (controller area network) powertrain systems bus
  • Restraints Control Module crash signal status/verification - Telematics Control Module to Restraints Control Module - High speed CAN powertrain systems bus
  • Land Rover InControl data - Telematics Control Module - Medium speed CAN body systems bus via Gateway Module - Medium speed CAN body systems bus to Instrument Cluster and Touch Screen.



A = Hardwired; AN = High speed CAN powertrain systems; AO = Medium speed CAN body systems; T = Co-axial


  1. Telematics Control Module (TCU)
  2. Engine Control Module (ECM)
  3. Restraints Control Module (RCM)
  4. Central Junction Box (CJB)
  5. Telematics speaker
  6. WiFi signal - TCU internal antenna
  7. GSM back-up signal - TCU internal antenna
  8. Ground
  9. Fuse - located in Rear Junction Box (RJB)
  10. Fuse - located in Battery Junction Box (BJB)
  11. Roof pod - GSM antenna
  12. Roof pod - GPS antenna
  13. GPS signal splitter
  14. SIM Card Reader
  15. Microphone
  16. Audio Head Unit (AHU) or Integrated Audio Module (IAM)
  17. bCall switch signal
  18. eCall switch signal
  19. Restraints Control Module (RCM) - crash signal


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