Exterior light-dependent control of interior lighting, function

P82.20-2456-09

Networking of components

CAN-B passenger compartment CAN bus

A1 Instrument cluster

A1r1 Instrument illumination dimmer and reset button

B38/2 Rain/light sensor

E15/3 Rear interior lamp

E17/3 Left front door entry/exit lamp

E17/4 Right front door entry/exit lamp

E17/5 Left rear door entry/exit lamp

N69/3 Left rear door control unit

N69/4 Right rear door control unit

N70 Overhead control panel control unit

N70s3 Door contact ON and OFF switch

S1 Exterior lamp switch

S17/3 Left front door contact switch

S17/4 Right front door contact switch

S17/5 Left rear door contact switch

S17/6 Right rear door contact switch

E17/6 Right rear door entry/exit lamp

E17/19 Left front door warning lamp

E17/20 Left rear door warning lamp

E17/21 Right front door warning lamp

E17/22 Right rear door warning lamp

N10/1 Driver-side SAM control unit with fuse and relay module

N10/2 Rear SAM control unit with fuse and relay module

N69/1 Left front door control unit

N69/2 Right front door control unit

If, in the instrument cluster (A1), the driving light switch is set to automatic, for the interior lights some of the functions can be controlled depending on the brightness of the outside light.

 The light function of the entrance/exit lamps is always controlled depending on the brightness.

Function requirements:

 No undervoltage or overvoltage is recognized.

 The door contact ON and OFF switch (N70s3) is in
position "ON".

 The instrument cluster (A1) produces the CAN message "automatic driving light function On".

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Function

The automatic light functions depend on the rain/light sensor (B38/2). Its signals are evaluated by the overhead control panel control unit (N70). Depending on the ambient brightness the rain/light sensor (B38/2) produces the CAN message "Night" or "Day".

If there is a fault in the rain/light sensor (B38/2), the CAN message is set to "Night".

If the CAN message "Terminal 58d ON" is < 5 % of the day value, the following automatic light functions are blocked:

 Exit lamps

 Interior lamps

 Make-up lamps

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If the CAN message "Terminal 58d ON" is > 5 % of the night value, the automatic light functions of the lamps are executed and the lamps are switched on in the event of a switch-on request.

Also the final shutoff of exit lamps when the doors are open takes place via the CAN message "automatic driving light function "On". The lamps are thus switched off synchronously.

If the door contact ON and OFF switch (N70s3) is set to "OFF", the interior lights are not switched on.

The following applies to the door contacts and light information:

 The lamps are switched on after the switch-on request via a door contact in the event of door contact ON and OFF switch (N70s3) "ON" and CAN message "Night" from the rain/light sensor (B38/2).

If, during an automatic light function, there is a change in the door contact status or light sensor information, this is taken into account and carried out immediately.

 Terminal 58d is a pulse-width modulated signal, whose duty cycle can be set via the instrument illumination dimmer and reset button (A1r1) from
12 to 100 %, as soon as the CAN message "Switch on standing lamps" is active.

 If there is a fault in the rain/light sensor (B38/2), the entrance and exit lamps behave as if "night" were recognized. If an undervoltage or overvoltage exists, the exit lamps always remain switched off.

 In Model 211.6, depending on equipment and special body, the number and position of the interior lamps may vary.