Work principles (Freelander 2)

The CJB supplies power to the driver's door switch box when the vehicle is in power mode 6 (ignition). The switch requests made by the driver's door switch block are then transmitted over the LIN bus to the driver's door module.

The driver door module interprets the request made by the switch block and responds as follows:

• If a driver's side rear door window control request is made, the request is sent over the LIN bus to the driver's side rear door module.
• If a request is made to control the passenger's door window, the request is transmitted over the medium speed CAN bus to the front passenger's door module.
• If a request is made to control the rear passenger side window, the request is transmitted via the medium speed CAN bus to the front passenger door module. This request is then transmitted via the LIN bus to the rear door module on the front passenger side.

Opening and closing the door window

Each door module has 2 signal power lines to its window lift switch. When a switch request is made, one of the lines is grounded through the door module. Depending on which line is grounded, the door module determines which direction of window movement has been requested.

The door modules supply power to the power window motors when requested by a switch or a general close request (see below). The door modules are connected to the corresponding electric motors by a power wire and a return wire; the motor polarity can be switched depending on the direction of the requested movement.


The power window motors also have Hall effect sensors. Hall sensors allow the door module to detect the position of the door window and motor jamming.

General closure

AJB provides continuous battery power to 4 door modules. This power is used to control the function "general closure". General closing allows you to close all 4 windows using radio remote control bullets.

NOTE: The sunroof panel is not part of the global closing system.

The global closing function is activated by pressing and holding the lock button on the radio remote control for 3 seconds. The general close request is received by the CJB from the RF receiver. The CJB then transmits this request to the driver and front passenger door modules on the medium speed CAN bus.

Initialization

When the vehicle is delivered from the factory, the power window system will operate slowly before initialization. The initialization process must be completed using the pre-sales check function (PDI), available in the Land Rover approved diagnostic system. See the PDI manual for more information.

The same applies to the case of replacing the door module. The new module must be initialized before the vehicle is handed over to the customer. The process of initializing a new module is performed using the function "New module", available in the Land Rover approved diagnostic system.

NOTE: When replacing a driver or front passenger door module, both modules will require initialization. This ensures that the software level is the same in both front door modules.