Back-Up Lamp

Courtesy of VOLVO CARS CORPORATION

Manual transmissions 

The reversing lights (10/48 and 10/55) are activated when reverse gear is engaged. The reverse gear switch (3/10) on the transmission then closes. A directly connected signal informs the central electronic module (CEM) (4/56) that reverse gear is engaged. The central electronic module (CEM) powers the lights directly via an output.

Automatic transmission 

The reversing lights (10/48 and 10/55) are activated when reverse gear is engaged. The transmission control module (TCM) (4/28) informs the central electronic module (CEM) (4/56) that reverse gear is engaged via the CAN network. The central electronic module (CEM) powers the lights directly via an output.