Normal Operation
WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
When the powertrain control module (PCM) detects the transmission in REVERSE, a signal is sent to the rear electronic module (REM) to illuminate the reversing lamps. Power from the battery junction box (BJB) is sent through circuit 29S-LG1 (OG/YE) to circuits 29S-LG9 (OG/BK) and 29S-LG16 (OG/GN) to the LH and RH reversing lamps, respectively. Ground for the LH reversing lamp is sent through circuit 31S-LG9 (BK/GN) to the REM. Ground for the RH reversing lamp is sent through circuit 31S-LG16 (BK/RD) to the REM. The REM individually controls the ground circuits for the reversing lamps.