Principles of Operation

Reversing Lamps

Principles of Operation

4R70E/4R75E Transmission

When the transmission is in REVERSE (R), the digital Transmission Range (TR) routes voltage to the reversing lamps relay coil. When the relay is energized, voltage is supplied to the reversing lamps. The reversing lamps relay is located in the Battery Junction Box (BJB).

6R80 Transmission/5.4L Engine Combination

The Transmission Control Module (TCM) (internal to the transmission) provides voltage and ground to the reversing lamps relay coil. When the transmission is in REVERSE (R), the TCM energizes the reversing lamps relay which supplies voltage to the reversing lamps.

6R80 Transmission/6.2L Engine Combination

The PCM provides ground to the reversing lamps relay coil. When the transmission is in REVERSE (R), the PCM energizes the reversing lamps relay which supplies voltage to the reversing lamps.