Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Handles, Locks, Latches and Entry Systems - Description

DOOR LATCHES

NOTE:

Driver door shown, other door latches similar

Handles, locks, latches and entry systems - Description

  1. Emergency key cover - driver door only
  2. Emergency key
  3. Emergency key barrel
  4. Exterior door handle assembly
  5. Interior door handle assembly
  6. Interior door latch cable
  7. Electrical connector
  8. Door latch assembly
  9. Exterior door latch cables
  10. Striker
  11. Interior door handle

The door latches are installed at the rear edge of each door and engage with corresponding strikers mounted to the 'B' and 'C' pillars. Each interior and exterior door handle is connected with a release cable to the corresponding door latch. In the driver door a third release cable is connected between the door latch and the concealed emergency mechanical door lock.

Each door latch is a sealed assembly comprising the following components:

  • Lock motor
  • Double lock motor (all except North American Specification (NAS) and Japan)
  • Door ajar switch.

An electrical connector is incorporated in each door latch and provides the interface with the applicable door control module and the CJB. The front door control modules are connected to the CJB on the MS CAN bus; the rear door control modules are connected via the Local Interconnect Network (LIN) bus to the front door control modules.

The CDL lock and CDL double lock motors control the engagement of the door latches using the release cables to lock and unlock the vehicle. When the vehicle is locked, the lock motors disengage the door latches from the exterior release cables. When the vehicle is double locked, the double lock motors also disengage the door latches from the interior release cables.

When the vehicle is subsequently unlocked, the interior and exterior release cables are re-engaged with the door latches.

On vehicles with keyless entry, the exterior door handles have lock and unlock proximity sensors located within the handle.

Rear Door Child Locks

The rear door latch assemblies incorporate child locks that provide additional rear occupancy safety. The child locks are electrically operated using the inhibit switch mounted driver door switchpack. Setting the child lock to the locked position will disengage the door latch interior release cable from the door latch, and prevent opening of the rear door using the interior door handle. The rear door windows are also disabled when the child locks are activated.

Door Ajar Switch

A door ajar switch is installed in each door latch assembly and is hardwired to the CJB. If the ignition is in power modes 4 or 6 and a door is opened or is not fully closed, the corresponding door ajar switch is opened to disconnect the ground from the CJB. A message is transmitted by the CJB on the high speed Controller Area Network (CAN) powertrain systems bus to the Gateway Module (GWM), where it is passed to the Instrument Cluster (IC) on the medium speed CAN comfort systems bus, to inform the driver with a message that a particular door is ajar.

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