Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Front Overhead Console

Front overhead console

  1. Microphone - Left Hand Drive (LHD) vehicles
  2. Microphone - Right Hand Drive (RHD) vehicles
  3. Telematics speaker
  4. Emergency call (eCall) switch
  5. Breakdown call (bCall) switch

The front overhead console houses the Breakdown call (bCall) and Emergency call (eCall) switches, microphone and Telematics speaker. The functions of the bCall and eCall switches are controlled by the TCU.

A diagnostic line (BTN), between the front overhead console and the TCU, enables the system to check the harness wiring is connected and the interface is functioning correctly. In operation, the TCU briefly pulls the diagnostic line (BTN) to ground, allowing the TCU to detect the circuit completion.

The microphone input is shared by the TCU and Audio Head Unit (AHU) or Integrated Audio Module (IAM). The location of the microphone changes depending on the vehicle market specification. The TCU controls the output to the telematics speaker.

Light Emitting Diode (LED) lamps, integrated into the eCall and bCall switches, provide switch illumination and indicate the status of the call operation.

The following illustration shows the LED lamp status for the eCall and bCall switches during normal use.

Front overhead console

  1. LED lamp off
  2. bCall - LED lamp illuminated - light blue color
  3. eCall - LED lamp illuminated - red color
  4. eCall/bCall - LED lamp flashing at 2Hz - amber color
  5. eCall/bCall - LED lamp illuminated - amber color
  1. MultiCAN bus asleep - bCall state ready (no call in progress)
  2. MultiCAN bus awake - bCall state ready (no call in progress)
  3. bCall switch pressed
  4. bCall state active (call preparation)
  5. bCall state active (call in progress)
  6. End of bCall
  7. MultiCAN bus awake - bCall state ready (no call in progress)
  8. Call back period - if a call is received during this phase the LED lamp flashes in an amber color until the call is established, at which point the LED lamp permanently illuminated in an amber color
  9. MultiCAN bus asleep - bCall state ready (no call in progress)
  10. MultiCAN bus asleep - eCall state ready (no call in progress and not possible to place an automatic call)
  11. Multi CAN bus awake - eCall state ready (no call in progress)
  12. eCall switch pressed
  13. eCall state active (call preparation)
  14. eCall state active (call in progress)
  15. End of eCall
  16. MultiCAN bus awake - eCall state ready (no call in progress)
  17. Call back period - if a call is received during this phase the LED lamp flashes in an amber color until the call is established, at which point the LED lamp is permanently illuminated in an amber color
  18. MultiCAN bus asleep - eCall state ready (no call in progress and not possible to place an automatic call)
  19. Breakdown call (bCall) switch
  20. Emergency call (eCall) switch

The eCall and bCall switch LED lamp status will change if a system hardware fault or an eCall failure due to a network problem occurs.

In the case of a hardware failure this will be accompanied by one of the following warnings in the message center:

  • "SOS System Limited"
  • "SOS System Not Available".

The message center warnings will also be accompanied by the following:

  • A fault signal is sent to the Telematics Service Provider (TSP)
  • A DTC is set in the TCU.

An eCall failure due to poor network coverage or modem error will be accompanied by the following warning in the message center:

  • "SOS System Not Available".

GLOBAL POSITIONING SYSTEM (GPS) SIGNAL SPLITTER

A GPS signal splitter shares the Global Positioning System (GPS) signal from the roof pod with the TCU and the AHU or IAM.

GLOBAL POSITIONING SYSTEM (GPS) SIGNAL SPLITTER

  1. GPS signal
  2. GSM signal
  1. Roof pod (GPS/GSM antenna)
  2. Telematics Control Module
  3. Integrated Audio Module (IAM) or Audio Head Unit (AHU)
  4. GPS signal splitter

ANTENNA

The roof pod is located towards the rear of the roof panel.

The roof pod on vehicles with the telematics system contains antennas for the reception of Global Positioning system (GPS) signals and Global System for Mobile communications (GSM) signals. Depending on vehicle specifications, the roof pod can also contain antennas for SDARS and Digital Audio Broadcast (DAB).

For additional information, refer to: Antenna (415-01 Information and Entertainment System, Description and Operation).

The GPS signal is passed via a co-axial cable to the GPS signal splitter where it is then passed to the Audio Head Unit (AHU) or the Integrated Audio Module (IAM) for use by the navigation system and to the Telematics Control Module (TCU) for use by the telematics system.

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