Central Junction Box (CJB) (Freelander 2)

The CJB receives input signals related to the exterior lighting system from the following switches:

• Light switch module
  • The side lights are on
  • Headlights are on
  • Automatic mode (AUTO) (if available)
  • Front fog light switch (if equipped)
  • Rear fog light switch
  • Dimmer (backlight brightness controller)
  • Headlight leveling adjuster (if available)
• Brake switch
• The left multifunction switch on the steering column controls the direction indicators and the high beam/signal lights
• Hazard warning light switch
• Precipitation/light sensor (LIN signal)

Chain protection

Two 60-amp fuse links in the battery junction box protect the power circuits for the left and right lighting circuits in the CJB respectively. Field-effect transistors (FETs) located in the CJB protect all external lighting circuits by detecting overloads and short circuits.

Unipolar transistors respond to the heat generated by a short circuit current. In a circuit with normal protection, a short circuit would cause the fuse to blow. The unipolar transistor, responding to the increased heat, switches off the circuit where this is occurring. Once the fault has been corrected or the transistor has cooled, the circuit can function normally again. If the fault is persistent, the unipolar transistor will cycle the power to the circuit on and off. The CJB generates fault codes that can be retrieved using the Land Rover approved diagnostic system. The fault code indicates where the fault is occurring, which helps in diagnosis.

Alarm signal

The exterior lights are used when arming and disarming the alarm system. When the driver locks or unlocks the vehicle, the hazard warning lights flash several times to provide the driver with a visual signal that the vehicle has been successfully locked or unlocked. For more information, refer to the chapter: Anti-Theft System - Active (419-01A Anti-Theft System - Active, Description and Function).

Audible warning signal for lights on

If the ignition is switched off (power mode 0) or in the accessory power position (power mode 4) and the rotary light switch is left in the parking lamp or headlamp position, a warning chime sounds when the driver opens a door. The chime reminds the driver that the exterior lights have been left on. The warning chime is emitted from a speaker located in the instrument cluster, which is activated when signals are received from the CJB via the high speed CAN bus indicating that a door is not closed and that the ignition is off.

Turning on the collision signal

When a crash signal is received from the restraint system control module (RCM), the CJB activates the hazard warning lamps and turn signal indicator lamps located in the instrument cluster. The hazard warning lamps remain illuminated until the ignition mode is changed to power mode 4 or power mode 0 and the RCM stops transmitting a crash signal. For additional information, refer to: Supplemental Restraint System of the Air Bags and Seat Belt Pretensioners (SRS) (501-20B Supplemental Restraint System, Description and Operation).

Headlight timer

The CJB unit has a headlamp timer function, which allows the headlamps to remain on for a certain period of time after the driver leaves the vehicle. This function is provided for the convenience of the driver, for whom the headlamps illuminate the way.

This function can only be activated by turning on the headlight alarm using the left multifunction switch on the steering column. It can be deactivated either by exceeding the time limit or by using the multifunction switch again.

The default setting can be changed by Land Rover or an authorised dealer. The default time setting is 30 sec but can be changed to 0 sec (off), 30 sec (default), 60 sec, 90 sec, 120 sec, 150 sec and 180 sec. For further information, refer to the chapter: Information and Message Centre (413-08 Information and Message Centre, Description and Operation).