Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Fuel Flap Latch

Fuel flap latch

  1. Fuel flap release motor
  2. Fuel flap
  3. Fuel flap housing
  4. Locking pin
  5. Connecting rod

The fuel flap latch is a motor operated latch housed within the fuel flap assembly which locks the fuel flap in the closed position.

The fuel flap is electrically locked and unlocked with a fuel flap release motor and pin. The motor is located on the upper surface of the fuel flap assembly moulding. The motor moves a connecting rod which moves to engage or release a pin on the connecting rod from a hole in the fuel flap hinge.

The fuel flap release motor is hardwired to the CJB and is operated by the vehicle CDL system. The CJB reverses the polarity of the motor power and ground connections via two relays in the CJB, allowing the connecting rod and pin to move in both directions for locking and unlocking. When unlocked, the fuel flap is manually opened to gain access to the fuel filler cap.

CENTRAL DOOR LOCKING ( CDL ) SYSTEM CONTROLS

The CDL system provides the driver with control over the locking and unlocking of the vehicle entry points, from inside or outside the vehicle.

Manual operation of the CDL system is achieved using the following:

  • Smart key and RF receiver
  • Driver door CDL lock/unlock switch
  • Passenger and rear door CDL lock switches.

SMART KEY AND EMERGENCY MECHANICAL LOCK

SMART KEY AND EMERGENCY MECHANICAL LOCK

  1. Lock or double lock switch
  2. Unlock switch
  3. Tailgate unlock switch
  4. Panic alarm switch
  5. Headlamp delay function switch
  6. Emergency key blade cover
  7. Emergency key blade
  8. Emergency key barrel cover
  9. Emergency key barrel operation with emergency key blade
  10. Keyless entry lock/ unlock sensors

The smart key contains an emergency key blade, concealed below a cover.

The driver door handle incorporates a mechanical emergency key barrel that is concealed behind a removable plastic cover. The emergency key blade is used to remove the plastic cover to reveal the emergency key barrel. The emergency key barrel allows the driver door to be mechanically unlocked and locked using the emergency key blade in the event that the remote CDL operation fails, or a vehicle power failure occurs.

When the emergency key barrel is used to open the driver door, the CDL system will not operate. If alarm system is active the vehicle alarm will sound when the door is opened. The vehicle is not able to be double locked, or the alarm system armed or deactivated using the emergency key blade.

The emergency key blade is also used to enable or disable the passenger airbag.

The emergency key blade number is recorded on a label attached to the smart key. Peel off the label and attach it to the designated area in the Service Record & Warranty Benefits, supplied in the vehicle literature pack.

This number will be required if a replacement emergency key blade is required.

The smart key contains a Printed Circuit Board (PCB), a transponder and a battery.

The smart key is identical for all vehicle specifications, but differs in the preset RF frequency and power that the smart key operates. The smart key for each vehicle specification is identified by a suffix change to the base part number as follows:

Each smart key features a unique identification code that is programmed within the integral transponder. The RF signal produced by the smart key contains the unique identification code and also a rolling code. During vehicle production, the unique identification codes of the valid smart keys are programmed into the Keyless Vehicle Module (KVM), and the rolling codes are also synchronized with the KVM.

When the smart key is operated, the KVM checks the unique identification and rolling code. The KVM will only respond if the RF signal produced is from a valid smart key for the vehicle A total of eight smart keys can be programmed in the KVM software to allow for replacement and the addition of smart keys. In service, the Land Rover approved diagnostic system may be used to communicate with the KVM for the following:

  • Identification of smart key allocation within the KVM
  • Enabling of new smart keys
  • Disabling of existing smart keys.

If the smart key rolling code loses synchronization with the KVM, the smart key functions will not operate. Synchronization between the smart key and the KVM is restored automatically when switches are pressed.

Additional switches are located on the smart key to provide convenience operation of the tailgate release, headlamp delay and panic alarm functions.

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