Emergency Lamp Control, Function - GF82.10-S-3013TRA

Model 447.6/7/8 

except code XM0 (Facelift) 

Model 448.7/8 

Function requirements, general 

• "Circuit 15 ON"

The circuit 15 status is sent by the electronic ignition lock control unit (EZS) (N73) over the interior CAN (CAN B).

Emergency light actuation, general 

The emergency light actuation ensures operation of the minimum exterior lighting in the event of failure of individual system components for the vehicle's exterior lights.

Function sequence for emergency light actuation 

In the event of any bus failure on the interior CAN, the signal acquisition and actuation module (SAM) control unit activates a software emergency light. The signal acquisition and actuation module (SAM) control unit then actuates the taillights and brake lights function (depending on the circuit 54 status) and activates the standing lights and low beams function.

In the event of a bus failure on the front end CAN (CAN G) (with CODE LG2 (LED Intelligent Light System)), the left headlamp control unit (E1/1n9) and the right headlamp control unit (E2/1n9) activate an software emergency light, thus turning on the standing lights and low beams functions.

If the humidity sensor/light sensor/rain sensor/sun sensor (B38/3) fails (model 447 or model 448 with code JF1 (Rain sensor)) or if there is a communication fault with the humidity sensor/light sensor/rain sensor/sun sensor, the signal acquisition and actuation module (SAM) control unit assumes it is "Night" and the auto on/off driving lights are activated.

On vehicles with CODE LG2 (LED Intelligent Light System), the left headlamp control unit, the right headlamp control unit, the left front actuation module, LED exterior lighting (E1/1n7) and the right front actuation module, LED exterior lighting (E2/1n7) are powered by the signal acquisition and actuation module (SAM) control unit. Power supply is provided crosswise via circuit 30L. In other words, if the signal acquisition and actuation module (SAM) control unit is defective, or if a circuit 30L is missing, or if a driver has failed, then, e.g. one side of the vehicle has active low beams while the other side has active standing lights.