2009 JAGUAR XF warning

Central Junction Box
The CJB receives inputs from the following switches via the instrument cluster and the medium speed CAN bus:
LH Steering column multifunction switch
- Side lamp position
- Headlamp position
- Automatic (AUTO) position
- Timer delay positions
- Turn signal indicators
- Headlamp flash and main beam positions.
The CJB receives direct inputs from the following components:
Stop lamp switch Rain/light sensor.
The CJB provides power supplies to the following lamps:
LH and RH front side lamps LH and RH front side marker lamps (if fitted) LH and RH static bending lamp (if fitted) LH and RH low beam headlamp LH and RH high beam headlamp.
Rear Junction Box
The RJB provides power supplies to the following lamps:
LH and RH tail lamps LH and RH stop lamps LH and RH front turn signal indicators LH and RH rear turn signal indicators LH and RH licence plate lamps LH and RH side marker lamps High mounted stop lamp Rear fog lamps Reverse lamps.
The RJB also provides a power supply to the LH and RH door modules. The door modules use the power supply to activate the turn signal indicator side repeater lamps located in the door
mirrors, on receipt of a medium speed CAN bus message from the RJB.
Circuit Protection
The CJB and the RJB provide circuit protection for their respective lighting circuits. The exterior lighting circuits are protected by Field Effect Transistors (FET's). The FET's can detect
overloads and short circuits and respond to heat generated by increased current flow caused by a short circuit.
On a normal conventionally protected circuit this would cause a fuse to blow. The FET's respond to the heat increase and disconnect the power supply to the affected circuit. When the fault
is rectified or the FET has cooled, the FET will reset and operate the circuit normally. If the fault persists the FET will cycle, disconnecting and reconnecting the power supply.
The CJB and the RJB store fault codes which can be retrieved using a Jaguar approved diagnostic system. The fault code will identify that there is a fault on a particular output circuit which
will assist with fault diagnosis and detection.
Alarm Indications
The exterior lighting system is used for alarm arm and disarm requests to show alarm system status.
When the driver locks and arms the vehicle, a visual indication of a successful lock and arm request is displayed to the driver by a single flash of the hazard flashers. If the vehicle is
superlocked, then the hazard flashers will flash a second time (200 ms off and 200 ms on) to confirm the superlock request.
If the alarm is activated, the hazard flashers are operated for 10, 30 second cycles of 200 ms on and 200 ms off, with a 10 second delay between each cycle.
• NOTE: On North American Specification (NAS) vehicles, the delay between the cycle when the alarm is activated is 60 seconds.
Lights on Warning
When the ignition is in the off power mode 0 or accessory power mode 4 and the lighting control switch is in the side lamp or headlamp position, a warning chime will sound if the driver's
door is opened. This indicates to the driver that the exterior lights have been left switched on.
The chime is generated from the instrument cluster sounder on receipt of a lights on signal, a driver's door open signal and an ignition off power mode 0 or accessory power mode 4 signal
via a medium speed CAN bus signal from the CJB.
Headlamp Timer
The RJB controls the headlamp timer function which allows the headlamps to remain on for a period of time after leaving the vehicle. This is a driver convenience feature which illuminates
the driveway after leaving the vehicle.
To operate the timer function the lighting control switch must be in one of the three headlamp timer positions when the ignition status is changed from ignition on power mode 6 to the off
power mode 0. The timer function will then be initiated and the low beam headlamps will be illuminated for the selected timer period.
• NOTE: If the lighting switch is in the AUTO position, the headlamp timer will not function when the ignition is changed to off power mode 0.
When the lighting control switch is in the autolamp exit delay position, the lighting control switch reference voltage flows through 4 of the resistors. The returned signal voltage is detected
by the instrument cluster which outputs a message on the medium speed CAN bus to the RJB that autolamps has been selected.
Depending on the selected exit delay position, the reference voltage to the autolamp exit delay switch is routed through 3, 2 or 1 resistors which is detected by the instrument cluster. The
cluster outputs a message on the medium speed CAN bus to the RJB that autolamp exit delay period has been selected at 30, 60 or 120 seconds respectively.
Crash Signal Activation
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When a crash signal is transmitted from the RCM (restraints control module), the RJB activates the hazard flashers. The hazard flashers continue to operate until the ignition is in the off
power mode 0 or accessory power mode 6. Once this ignition state has occurred, the RCM will cease to transmit the crash signal.
LIGHTING CONTROL SWITCH
The instrument cluster outputs 2 reference voltages to the rotary lighting control switch; one feed being supplied to the light selection function of the switch and the second feed being
supplied to the auto headlamp exit delay function. The switch position is determined by instrument cluster by the change in returned signal voltage which is routed through up to 4
resistors in series depending on the selection made.
OFF - When the lighting control switch is in the off position, the reference voltage flows through 1 of the resistors. The returned signal voltage is detected by the instrument cluster which
outputs a message on the medium speed CAN bus to the CJB that no lighting selection is made. The reference voltage to the auto headlamp exit delay switch is routed through 4 resistors
which is detected by the instrument cluster which outputs a message on the medium speed CAN bus to the CJB that auto headlamp or exit delay has not been selected.
SIDE LAMPS - When the lighting control switch is in the side lamp position, the reference voltage flows through 2 of the resistors. The returned signal voltage is detected by the instrument
cluster which outputs a message on the medium speed CAN bus to the CJB to activate the side lamps. The reference voltage to the autolamp exit delay switch is routed through 4 resistors
which is detected by the instrument cluster which outputs a message on the medium speed CAN bus to the CJB that auto headlamp or exit delay has not been selected.
HEADLAMPS - When the lighting control switch is in the headlamp position, the reference voltage flows through 3 of the resistors. The returned signal voltage is detected by the instrument
cluster which outputs a message on the medium speed CAN bus to the CJB to activate the headlamps. The reference voltage to the auto headlamp exit delay switch is routed through 4
resistors which is detected by the instrument cluster which outputs a message on the medium speed CAN bus to the CJB that auto headlamp or exit delay has not been selected.
AUTOLAMPS - When the lighting control switch is in the auto headlamp position, the reference voltage flows through 4 of the resistors. The returned signal voltage is detected by the
instrument cluster which outputs a message on the medium speed CAN bus to the CJB to activate the autolamp function. The reference voltage to the autolamp exit delay switch is routed
through 4 resistors which is detected by the instrument cluster which outputs a message on the medium speed CAN bus to the CJB that auto headlamp has been selected.
AUXILIARY LIGHTING SWITCH
Headlamp Leveling Rotary Thumbwheel (Halogen headlamps only)
A power supply is passed to the headlamp leveling thumbwheel from the ignition relay in the EJB. Depending on the position of the thumbwheel, the voltage passes through 1, 2 or 3
resistors connected in series. The voltage through the resistors is passed to the headlamp leveling motor controller in each headlamp. The received voltage is determined as a request for
the appropriate level position and the controller powers the headlamp level motors to the applicable position for each headlamp.
Rear Fog Lamp Switch
The instrument cluster supplies a reference voltage and return to the rear fog lamp switch. The fog lamp switch is a non-latching, momentary switch.
When the fog lamp switch is off the reference voltage is passed through a 1Kohm resistor. The voltage through the resistor is returned to the instrument cluster that determines that no
request for fog lamp operation has been made.
When the driver presses the fog lamp switch, the reference voltage is passed through a 330 ohm resistor. The change is return voltage is sensed by the instrument cluster which
determines fog lamp operation has been requested. The instrument cluster transmits a medium speed CAN bus signal to the RJB providing the lighting control switch is in the correct
position. The RJB reacts to the message and provides a power supply to the 3 LED (light emitting diode)'s in each rear fog lamp. A fog lamp warning lamp in the instrument cluster will also
be illuminated when the fog lamps are operating.
The RJB will only activate the rear fog lamps if the headlamps are selected on or are active with auto headlamp activation. When the headlamps are turned off the fog lamps are also
turned off. When the headlamps are next switched on, the fog lamps will not be activated until the driver requests fog lamp operation.
• NOTE: The fog lamps do operate when DRL (daytime running lamps) are active.
HEADLAMP LEVELING
Manual Headlamp Leveling - Halogen headlamps only
A power supply is passed to the headlamp leveling motor in each headlamp from the ignition relay in the EJB. When a signal voltage is received from the headlamp leveling rotary
thumbwheel, the headlamp leveling motor controller in each headlamp uses the power supply to operate the motors and move the headlamp to the requested position.
Static Dynamic Headlamp Leveling - Xenon headlamps only
The headlamp leveling module receives a power supply from the ignition relay in the EJB. The same power supply is also supplied to the headlamp leveling motor in each headlamp
assembly. The front and rear height sensors are connected to the headlamp leveling module and receive a power and ground from the module. Each sensor has a signal line to the
headlamp leveling module to return height information to the module. The module uses the height signals from the sensors to calculate the vehicle attitude and supplies a signal to each
motor to power the headlamp to the required position.
Component Description
EXTERIOR BULB TYPE/RATING
The following table shows the bulbs used for the exterior lighting system and their type and specification.
• NOTE: The tail lamps, side marker lamps, stop lamps, high mounted stop lamp and rear fog lamps are illuminated by LED's and are non-serviceable components.
LIGHTING CONTROL SWITCH
BulbTypeRatingHalogen headlamp - Projector module low/high beam - Not NASH755WHalogen headlamp - Projector module low/high beam - NAS onlyH1160WXenon headlamp - Projector module low/high beam - All marketsD1S35WHigh beam only (halogen) - High/low beam (xenon) - All marketsH755WFront side lamps - all marketsW5W Halogen cool blue (HCB)5WFront turn signal indicators - Not NASPY21W21WFront turn signal indicators - NAS only3457AK27WRear turn signal indicators - All marketsPSY19W19WTurn signal indicator side repeaters - All marketsWY5W5WReverse lamps - All marketsPS19W19WLicence plate lamps - All marketsW5W5W
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ItemDescription Off position
Side lamp position
High beam position
RH turn signal indicator
Headlamp flash/high beam off position
LH turn signal indicator
Headlamp position
AUTO headlamp position
Headlamp timer 120 second delay position
Headlamp timer 60 second delay position
Headlamp timer 30 second timer delay position
The lighting control switch is located on the LH steering column multifunction switch. The lighting control switch is a rotary control with positions for the following lighting functions:
Off Side lamps Headlamps AUTO headlamps Headlamp timer (3 time period selections).
The LH steering column multifunction switch also provides for the following functions:
Low beam headlamps High beam headlamps Headlamp flash LH and RH turn signal indicators Trip computer function button.
Refer to: Information and Message Center (413-08 Information and Message Center, Description and Operation).
The switch has a turn signal indicator lane change function. If the switch is gently pushed to either turn signal indicator position and then released, the applicable turn signal indicators will
flash 3 times and then will be automatically cancelled. If a turn signal indicator bulb fails, the green turn signal warning indicator in the instrument cluster will flash at twice the normal rate
and the audible ticking from the instrument cluster sounder will also be at twice the normal rate.
AUXILIARY LIGHTING SWITCH
• NOTE: RHD (right-hand drive) switch shown
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ItemDescription Xenon control module (not fitted on halogen low beam headlamps)
Turn signal indicator
Side marker lamp (NAS only)
Projector module - Low beam headlamp(Halogen) – Low/High beam headlamp (xenon)
Cornering/static bending lamp (if fitted)
Side lamp
High beam headlamp
Power wash jets trim cover
Headlamp powerwash
Side marker lamp bulb (NAS only)
Turn signal indicator bulb
Headlamp adjuster screw (2 off)
Cover - Low beam headlamp projector module bulb
Mounting collar
Xenon igniter unit and bulb
Xenon igniter electrical connector
Cornering/static bending lamp bulb (if fitted)
Side lamp bulb
High beam headlamp bulb
Cover - Side lamp, cornering/static bending lamp (if fitted) and high beam headlamp bulbs
Electrical connector
Bi-Xenon Headlamp
The bi-xenon headlamp uses a projector lens, similar to the halogen headlamp. The projector module comprises an ellipsoidal lens and a reflector. The projector reflector collects the light
produced by the halogen bulb and projects the light into a focal plane containing a shield. The contour of the shield is projected onto the road by the lens. A complex surface reflector is
used for the halogen fill in high beam lamp. This type of reflector is divided into separate parabolic segments, with each segment having a different focal length. The low and high beam
bulbs are quartz halogen H7, with a rating of 55W. The bulbs are retained in the headlamp unit with conventional wire retaining clips.
A tourist lever mechanism is located on the right hand side of the projector module. This mechanism moves a flap to blank off a portion of the beam spread to enable the vehicle to be
driven in opposite drive hand markets without applying blanking decals to the headlamp lens. The beam is changed by removing the access cover at the rear of the lamp assembly and
moving a small lever located near the bulb holder, at the side of the projector.
• NOTE: The tourist lever is not fitted to NAS vehicles.
WARNING: The Xenon system generates up to 30000 volts and contact with this voltage could lead to fatality. Make sure that the headlamps are switched off before working on the
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The high mounted stop lamp uses 12, red colored LED's which illuminate through a clear lens. The high mounted stop lamp functionality is the same as that described for the stop lamps.
TURN SIGNAL INDICATOR SIDE REPEATER LAMPS
The turn signal indicator side repeaters are located in each door mirror. On vehicles from 10MY the lamp is an LED unit which illuminates in an orange color. The LED unit is secured to the
mirror bezel with 2 screws and is connected to the mirror wiring harness with a 2 pin connector.
The side repeaters have the same functionality and operate in conjunction with the front and rear turn signal indicators and the hazard warning flashers.
HAZARD FLASHERS
The hazard flashers are activated by a non-latching switch located in the switch pack located in the center of the instrument panel. The hazard flashers operate at all times when selected
and operate independent of the ignition mode.
When the hazard flashers are selected on by the driver, a ground path is momentarily completed to the CJB which activates the front and rear and side repeater turn signal indicators. A
second press of the switch is sensed by the CJB and the hazard flasher are deactivated. When the hazard flashers are active, they override any request for turn signal indicator operation.
The hazard flashers can also be activated by a crash signal from the RCM.
Refer to: Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)
(501-20B Supplemental Restraint System, Description and Operation).


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