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Home >> Mercedes Benz >> 2013 >> CL600 >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Battery, Collision Avoidance, Control Modules/Units, Displays, & Fuse/Relay Assignment -- Basic Knowledge -- Cl600 (216.376) >> Basic Knowledge >> Night View Assist, function - GF54.30-P-0005LE

Night View Assist, function - GF54.30-P-0005LE

MODEL 216.3, 221.0 /1 with CODE (610) Night vision assist as of model year 2009 /YoM 08 

Function requirements, general 

IMPORTANT The request to "switch on low beams" can only be issued with a circuit 15 ON status. The EZS control unit (N73) sends the status of circuit 15 via the interior CAN (CAN B) to the front SAM control unit with fuse and relay module (N10/1). The upper control panel control unit (N72/1) reads in the status of the rotary light switch via the instrument panel LIN (LIN 1) and sends it via the interior CAN to the front SAM control unit.

Night View Assist, general 

The Night View Assist system records people and obstacles in the driver's field of view, which are on the roadway, before they appear in the conventional headlamp light cone. For this purpose, the Night View Assist camera (B84/2) is located near the rain/light sensor. This is designed for infrared light and records the routing of the road in front of the vehicle before dusk.

The image from the Night View Assist camera corresponds to the view through the windshield when the high beams are switched on. After the images have been processed by the Night View Assist control unit (N101), they are shown on the multifunction display (A1p13) of the instrument cluster (A1).

Fig 1: Identifying View Of Night View Assist Camera On Electronic Speedometer
G07539351Courtesy of MERCEDES-BENZ USA

IMPORTANT The Night View Assist camera operates like a conventional camera, but with an extended infrared light spectrum. The video picture is therefore also displayed when the infrared illumination is not activated.

The windshield must allow infrared light to pass through in the field of view of the Night View Assist camera (possible negative influences are: barrier film, black print, adhesive labels, stone chippings, ice or dirt).

IMPORTANT The Night View Assist camera must be recalibrated after replacement of the windshield or a component of the Night View Assist system or after removal of the Night View Assist camera. The routing of the road is also illuminated with infrared light at night and at a vehicle speed of v > 15 km/h.

Because infrared light is invisible to the human eye, oncoming traffic is not dazzled.

According to ambient brightness, the Night View Assist system differentiates between the following operating modes:

In twilight mode, only pictures recorded by the Night View Assist camera are shown in the multifunction display.

Additionally, in night mode, the left infrared lamp (E1e11) is activated in the left front lamp unit (E1) and the right infrared lamp (E2e11) is activated in the right front lamp unit (E2). The road in front of the vehicle is then illuminated with infrared light up to s = 150 m.

IMPORTANT The infrared light function test is carried out using a diagnosis tester and is possible for approx. t = 10 s. For this purpose, a white surface (e.g. a piece of white paper) has to be held in front of the infrared lamp.

When observed from the side, a red-green shimmer can be seen on the white surface. A repeat of the function test is only possible after t = 5 min.

The master control unit of the Night View Assist system is the Night View Assist control unit. This processes all relevant information, evaluates it and controls the output of the pictures recorded by the Night View Assist camera on the multifunction display of the instrument cluster.

Vehicles up to 31.5.09:

The Night View Assist control unit is a station on the vehicle dynamics CAN (CAN H). The ESP control unit (N47-5) receives system-relevant information via the chassis CAN (CAN E) and sends this information via the vehicle dynamics CAN to the Night View Assist control unit.

Vehicles as of 1.6.09:

The Night View Assist control unit is a station on the chassis CAN. This allows all system-relevant information to be received directly by the Night View Assist control unit via the chassis CAN.

On model 221 as of 1.6.09 and on model 216 as of 1.6.10, the Night View Assist system also has the person detection function "Intelligent Nightview" (night view with person detection) with which persons who are on unlit roads outside built-up areas can be detected. The detected persons are shown with highlighted edges on the multifunction display. Person detection is possible up to a distance of s = 90 m in front of the vehicle.

On vehicles as of 1.6.11, the headlamp light cone is additionally deflected toward the detected persons. This function is referred to as "hazard illumination".

The Night View Assist system includes the following subfunctions:

Function sequence for Night View Assist 

The Night View Assist system is activated by pressing the Night View Assist button (S1s9).

The upper control panel control unit reads in the status of the Night View Assist button via the instrument panel LIN and sends this via the interior CAN, central gateway control unit (N93) and central CAN (CAN F) to the instrument cluster and additionally to the Night View Assist control unit.

The Night View Assist control unit receives the status of the Night View Assist button via the following:

In addition, the instrument cluster checks the following conditions for display of the video images recorded by the Night View Assist camera on the multifunction display:

IMPORTANT The low beams can be switched on manually using the rotary light switch or automatically owing to the auto on/off headlamps function (the rain/light sensor signals "twilight" or "night") or the daytime running lights.

The EZS control unit sends the status of circuit 15 via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

The upper control panel control unit reads in the status of the rotary light switch via the instrument panel LIN and sends this via the interior CAN, central gateway control unit and central CAN to the instrument cluster.

The rain/light sensor detects the ambient brightness. The overhead control panel control unit (N70) reads in the data from the rain/light sensor and sends it via the interior CAN, central gateway control unit and central CAN to the instrument cluster.

In addition, the overhead control panel control unit sends the "low beams ON" request (generated from the data from the rain/light sensor (auto on/off driving lights)) via the interior CAN to the front SAM control unit. The instrument cluster sends the request for the daytime running lights function via the central CAN, central gateway control unit and interior CAN to the front SAM control unit. The front SAM control unit then sends the "low beams ON" status (resulting from the request for manual or auto on/off driving lights or daytime running lights) via the interior CAN, central gateway control unit and central CAN to the instrument cluster.

The instrument cluster calculates the vehicle speed from the wheel speeds that are detected by the following sensors:

The ESP control unit (without model 221.095/195) or the regenerative braking system control unit (N30/6) (model 221.095/195) reads in the signals from the rpm sensors and sends them via the chassis CAN, central gateway control unit and central CAN to the instrument cluster.

The "gear range R engaged" status is defined by the position of the transmission selector lever. The intelligent servo module for DIRECT SELECT (A80) sends the transmission selector lever position via the drive train CAN (CAN C), CDI control unit (N3/9) (with diesel engine) or ME-SFI control unit (N3/10) (with gasoline engine), chassis CAN, central gateway control unit and central CAN to the instrument cluster.

IMPORTANT With gear range R engaged or at a vehicle speed of v > 260 km/h, the video images recorded by the Night View Assist camera are not displayed.

If the function requirements are satisfied, the instrument cluster changes from the standard display of the electronic speedometer (dial-type gauge) to the bar display with Night View Assist video image.

The instrument cluster then sends the "NightView mode active" status and information regarding the brightness and contrast of the image shown in the multifunction display to the Night View Assist control unit.

The Night View Assist control unit receives this information via the following:

The Night View Assist camera sends the video images via the digital video interface (low voltage differential signal (LVDS) line) to the Night View Assist control unit.

The Night View Assist control unit evaluates the information from the instrument cluster and processes the brightness distribution in the video images recorded by the Night View Assist camera. Extremely bright image areas that could dazzle the driver are filtered out.

The Night View Assist control unit then also checks the following conditions for display of the video images recorded by the Night View Assist camera on the multifunction display:

The overhead control panel control unit sends the "low beams ON" request (generated from the data from the rain/light sensor (auto on/off driving lights)) via the interior CAN to the front SAM control unit. The front SAM control unit then sends the "low beams ON" status (resulting from the request for manual or auto on/off driving lights or daytime running lights) to the Night View Assist control unit.

The Night View Assist control unit receives this information via the following:

The Night View Assist control unit receives the data from the rain/light sensor via the following:

The Night View Assist control unit receives information regarding vehicle speed via the following:

IMPORTANT The Night View Assist control unit also receives the signals from the rpm sensors redundantly.

The Night View Assist control unit receives the position of the transmission selector lever via the following:

If the function requirements are satisfied, the Night View Assist control unit sends the processed video images via the digital video interface (LVDS line) to the instrument cluster.

The video images recorded by the Night View Assist camera and processed by the Night View Assist control unit are now shown on the multifunction display.

The rain/light sensor makes a distinction between the following brightness values on the basis of the ambient brightness:

In night mode, the infrared emitters in the front lamp unit are additionally switched on. The Night View Assist control unit sends the request for this after the following input factors have been evaluated:

The front SAM control unit receives this "infrared emitters ON" request via the following:

The front SAM control unit then actuates the infrared emitters.

If the vehicle speed drops below v = 5 km/h, the infrared emitters are switched off.

Intelligent Nightview, function sequence (model 221 as of 1.6.09 and model 216 as of 1.6.10) 

The Intelligent Nightview function is intended to prevent accidents involving persons who are on unlit roads outside built-up areas. As soon as the Night View Assist camera detects persons in its field of view during night mode, they are shown with highlighted edges on the multifunction display.

For this it has to be defined whether the vehicle is in a town or on a non-illuminated country road. This is accomplished by evaluating the data from the multifunction camera (A40/11).

The multifunction camera differentiates between light sources originating from one's own vehicle and surrounding light sources (e.g. street lamps).

When the multifunction camera detects light sources not generated by the vehicle in the area surrounding the vehicle, the Intelligent Nightview function (person detection) is deactivated.

The multifunction camera sends corresponding information via the chassis CAN to the Night View Assist control unit.

The Night View Assist system additionally evaluates the following information to predict the vehicle's own movement:

The yaw rate sensor for lateral and longitudinal acceleration (B24/15) sends information regarding the yaw behavior of the vehicle via the vehicle dynamics CAN, ESP control unit or regenerative braking system control unit and chassis CAN to the multifunction camera and, on vehicles up to 31.5.11, also to the Night View Assist control unit.

The steering angle and the steering angle speed are detected by the steering angle sensor (N49).

The steering column tube module (N80) reads in the data from the steering angle sensor and sends it via the chassis CAN to the multifunction camera and, on vehicles up to 31.5.11, also to the Night View Assist control unit.

IMPORTANT On vehicles as of 1.6.11, this information is evaluated by the multifunction camera (A40/11) only.

IMPORTANT Because of the way the person detection system works, misinterpretations can occur, e.g. objects are perceived as individuals and shown with highlighted photo edges.

The identification rate drops off with increasingly unfavorable conditions (e.g. strong backlighting, rain, snow, bright background or very darkly clothed people) and individuals are not shown highlighted.

Intelligent Nightview (person detection), function (model 221 as of 1.6.09, model 216 as of 1.6.10) 

Fig 2: Identifying Intelligent Nightview (Person Detection) With Symbols
G07539352Courtesy of MERCEDES-BENZ USA

Additional function requirements for hazard illumination ON (as of 1.6.11) 

Hazard illumination ON, function sequence (as of 1.6.11) 

With the hazard illumination function, the headlamp light cone of the front lamp unit next to the road edge is deflected toward the detected person.

The driver can thus avoid a potential collision with the detected person. Vehicles ahead and oncoming road users are not dazzled. The hazard illumination function is always active and can be deactivated by briefly holding down the Night View Assist button. The status icon in the multifunction display disappears to indicate deactivation to the driver.

The multifunction camera sends status information for the adaptive high beams function to the Night View Assist control unit. The Night View Assist control unit calculates the expected position of the detected person in the driver's field of vision on the basis of various variables (e.g. vehicle speed) and sends corresponding data via the chassis CAN, central gateway control unit and front end CAN (CAN G) to the xenon headlamp control unit (E1n1) (on right-hand drive vehicles) or to the xenon headlamp control unit (E2n1) (on left-hand drive vehicles). The corresponding xenon headlamp control unit then actuates the left light distribution actuator motor (E1m3) (on right-hand drive vehicles) or the right light distribution actuator motor (E2m3) (on left-hand drive vehicles) accordingly.

The cover that partially obstructs the low beam light cone is moved so that the low beam light cone is deflected toward the detected person.

Hazard illumination active, function 

Fig 3: Identifying View Of Person Detection By System With Hazard Illumination Active Symbol
G07539353Courtesy of MERCEDES-BENZ USA

Display of system messages, function sequence 

The Night View Assist control unit monitors the Night View Assist system. Detected malfunctions or faults are recorded and shown to the driver as fault messages in the multifunction display.

The currently active function is indicated by means of an appropriate status icon.

The Night View Assist control unit sends corresponding data via the following:

System messages:

  Night View Assist, location of components   GF54.30-P-0005-01LE 
REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic, Night View Assist Model 216 up to 31.5.09 PE54.30-P-2053-97CAB
Model 216 as of 1.6.09 PE54.30-P-2053-97CAC
Model 221 up to 31.5.09 PE54.30-P-2053-97SAB
Model 221 as of 1.6.09 PE54.30-P-2053-97SAC
  Night View Assist, block diagram   GF54.30-P-0005-03LE 
  Component description for instrument cluster A1
Model 216, 221 (except 221.095/195)		 GF54.30-P-6000LE
Model 221.095/195 GF54.30-P-6000LEH
  Component description for multifunction camera A40/11
Model 221 as of 1.6.09,
Model 216 as of 1.6.10		 GF54.21-P-3300LE 
  Component description for intelligent servo module for DIRECT SELECT A80
Transmission 722.6		 GF27.19-P-4020ACS
Transmission 722.9 (except 722.931/950) GF27.19-P-4020AHS
Transmission 722.931 GF27.19-P-4020AHT
Transmission 722.950 GF27.19-P-4020LEH
  Component description for yaw rate sensor for lateral and longitudinal acceleration B24/15 GF42.45-P-4810LE
  Component description for Xenon headlamp control unit E1n1, E2n1 As of 1.6.11 GF82.10-P-2114LE
Component description for ME-SFI [ME] control unit With engine 275 GF07.61-P-6000MOS
With engine 276.9 GF07.61-P-6000MMB
  Component description for front SAM control unit with fuse and relay module N10/1 GF54.21-P-6070LE 
  Component description for regenerative braking system control unit N30/6
On model 221.095/195		 GF42.22-P-1100LEH
  Component description for ESP control unit N47-5
On model 216, 221 (except 221.095/195)		 GF42.45-P-5118LE
  Component description for overhead control panel control unit N70 GF82.20-P-5216LE
  Upper control panel control unit, component description N72/1 GF54.21-P-6040LE 
  EZS control unit, component description N73 GF80.57-P-6003LE
  Component description for steering column tube module N80 GF54.21-P-6050LE 
  Component description for central gateway control unit N93 GF54.21-P-4170LE 
  Night View Assist control unit, component description N101 GF54.30-P-6200LE
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