Backup Lamp Actuation, Function - GF82.10-P-3011FR

Model 257, 290 

up to model year 2021 

Function requirements, general 

• No undervoltage or overvoltage
• Terminal 15 ON

The electronic ignition lock control unit (N73) sends the status of circuit 15 via interior CAN (CAN B) to the front SAM control unit (N10/6).

Backup light actuation, general 

The backup light actuation enables the traffic lane to the rear of the vehicle to be illuminated when backing up.

Function sequence for backup light actuation 

Backup light actuation is activated by the front SAM control unit when the "R" gear range is engaged.

Drive range "R" is engaged by the fully integrated transmission control electric controller unit control unit (Y3/8n4). The fully integrated transmission control electric controller unit control unit then sends the "Drive range R engaged" status to the electronic ignition lock control unit over the drive train (CANC1), drive train control unit (N127) and the suspension FlexRay (Flex E).

The electronic ignition lock control unit generates the "reverse gear engaged" signal and sends this over the interior CAN to the front SAM control unit.

The front SAM control unit sends the "Switch on backup lights" request to the rear SAM control unit (N10/8) via interior CAN.

The rear SAM control unit receives this signal and actuates the following components directly:

• Left backup lamp (E3e3) in the left rear lamp unit (E3)
• Right backup lamp (E4e3) in the right rear lamp unit (E4)

On vehicles with CODE 550 (Trailer hitch), the front SAM control unit sends the "Switch on backup lights" request via interior CAN to the trailer recognition control unit (N28/1), which actuates the backup lights on the trailer via the trailer socket (X58).

	Electrical function schematic for backup light actuation		PE82.10-P-2058-97XBA
	Overview of exterior lights system components		GF82.10-P-9998FR