Exterior Lighting

The exterior lighting consists of:

• two headlamp assemblies, each containing a:

• Headlamp
• Static bending lamp
• Turn signal indicator
• Combined daytime running lamp and side lamp
• Side marker lamp and reflector (NAS market vehicles only).

• two tail lamp assemblies, each containing a:

• Turn signal indicator
• Tail lamp unit
• Stop lamp
• Side marker
• Reverse lamp
• Rear fog lamp

• a lighting control switch and steering column multifunction switch
• Body Control Module/Gateway Module (BCM/GWM) assembly
• a High Mounted Stop Lamp (HMSL)
• front and rear height sensors (Xenon headlamps only)
• two license plate lamps
• auxiliary lighting switch
• brake pedal switch
• reverse lamp switch
• an Image Processing Control Module (IPCM) (market dependant)
• a hazard warning lamp switch
• warning indicators
• rain/light sensor
• Battery Junction Box (BJB).

The exterior lighting is controlled by the BCM/GWM assembly as follows:

• control and monitoring of the exterior lamps including the turn signal indicators and hazard warning lamp functionality
• monitoring and evaluation of control inputs from other system control modules and output of applicable messages in the Instrument Cluster (IC) message center.

The BCM/GWM assembly is connected to the Medium Speed (MS) and High Speed (HS) Controller Area Network (CAN) buses. The BCM/GWM assembly contains a microprocessor which performs the control, monitoring and evaluation of functions.

Driver lighting selections are made using the lighting control switch and left steering column multifunction switch, the rear fog lamp switch and the hazard warning lamp switch. The BCM/GWM assembly operates the stop lamps using the inputs from the brake pedal switch.

Depending on market specification, the lighting system may include:

• an Auto High Beam (AHB) function, where the headlamps are automatically switched between low and high beam in response to signals from the IPCM
• an autolamps function, where the exterior lights are automatically turned on or off in response to signals from the rain/light sensor used for automatic wiper operation.

For additional information, refer to: Wipers and Washers (501-16 Wipers and Washers, Description and Operation).

Driver lighting selections using the left steering column multifunction switch are passed to the BCM/GWM assembly via the Steering Wheel Module (SWM) on a Local Interconnect Network (LIN) bus. The BCM/GWM assembly provides circuit protection for all exterior lighting circuits.

The lighting system has an autolamps function which is controlled by the BCM/GWM assembly on receipt of signals from the rain/light sensor located at the top of the windshield. The exterior lights are turned on or off in response to ambient light signals from the rain/light sensor on a LIN bus connection to the BCM/GWM assembly. The autolamps can also be activated when the windshield wipers are activated by signals from the rain/light sensor, or when the driver activates the wipers in the continuous wipe position for more than 20 seconds.

Three levels of headlamp specification are available:

• halogen
• xenon
• xenon with Adaptive Front lighting System (AFS).

In certain markets the headlamps feature a static bending lamp which illuminates the area at the side of the vehicle when turning into driveways for example. Only the D3S xenon bulb and the xenon ballast resistor are serviceable, no other headlamp components are available individually. Failure of any Light Emitting Diode (LED) requires replacement of the complete lamp assembly.

The tail lamps comprise of an inner and an outer tail lamp assembly.

The outer lamp comprises:

• a reverse lamp
• a turn signal indicator
• tail lamp functions
• a stop lamp
• a side marker lamp (NAS market vehicles only)

The inner lamp comprises

• a fog lamp
• tail lamp functions

All versions of the headlamps have impact resistant polycarbonate lenses. Removable covers at the rear of the headlamps allow for bulb replacement. The headlamps require removal for bulb replacement.

The xenon headlamps use a D3S xenon bulb which operates in both low and high beam.

Static dynamic leveling is standard on all xenon headlamps. The static dynamic system uses height sensors equipped to the front and rear suspension which processes the height sensor signals and adjusts the headlamp vertical alignment accordingly.

Manual headlamp leveling is used only on vehicles equipped with halogen lamps. A rotary leveling thumbwheel is located in the auxiliary lighting switch in the Instrument Panel (IP), adjacent to the steering column. Halogen headlamps use a H3B bulb which operates in low beam.

Headlamp washer jets are a standard fitment on xenon headlamps. For additional information, refer to: Wipers and Washers (501-16 Wipers and Washers, Description and Operation).

Turn signal indicators and high and low beam functions are controlled from the left steering column multifunction switch. The turn signal indicators have a lane change feature. A single press and release of the multifunction switch in either direction will operate the selected turn signal indicators for three cycles.

An IPCM system may also be equipped as an optional feature which automatically controls the high beam headlamps.