Principles of Operation

PRINCIPLES OF OPERATION

The CJB provides a power supply to the driver door switch pack when the vehicle is in power mode 6 (ignition on). Switch requests made using the driver door switch pack are then delivered to the driver door module over the LIN bus.

The driver door module interprets the request made using the switch pack and responds as follows:
^ If the request is for drivers side rear window operation, a request is transmitted over the LIN bus to the driver side rear door module.
^ If the request is for front passenger window operation, a request is transmitted over the medium speed CAN bus to the passenger door module.
^ If the request is for passenger side rear window operation, a request is transmitted over the medium speed CAN bus to the passenger door module. This request is then forwarded over the LIN bus to the passenger side rear door module.

Door Glass Opening and Closing

Each door module provides 2 signal feeds to its window lift switch. When a switch request is made, a ground path is created on one of the lines via the door module. From this the door module can determine which direction of travel has been requested.

The door modules power the door glass motors on receipt of a switch request or a request for Global Closing (see below). The door modules provide feed and return paths to their respective motor, which can switch depending on the direction of travel requested.

The door glass motor assemblies also contain a Hall effect sensor. The Hall effect sensor allows the door module to determine the position of the door glass and if a motor stall condition has taken place.

Global Closing

The AJB provides a constant battery feed to the 4 door modules. This feed is used operate the 'Global Closing' feature. Global Closing allows all 4 windows to be closed using the Radio Frequency (RF) handset.

NOTE: The roof opening panel is not part of the Global Closing feature.

The Global Closing feature is activated by pressing and holding the 'lock' button on the RF handset for 3 seconds. The request for Global Closing is provided to the CJB by the RF receiver. The CJB then transmits this request to the driver and passenger door modules over the medium speed CAN bus.

Initialization

When the vehicle is delivered from the factory the window lift system will operate slowly until it has been initialized. The initialization process should be carried out using the Pre-Delivery Inspection (PDI) feature contained within the Land Rover approved diagnostic system.

Similarly, if a door module is replaced, the new module will require initialization before handover to the customer. The initialization process for a new module is carried out using the 'New Module' feature contained within the Land Rover approved diagnostic system.

NOTE: If a driver door or passenger door module is replaced, both will require initialization. This ensures both front controlling modules contain the same level of software.