What the function does
Enable Reverse Lights and the VCU gets an output that turns the reverse lamps on whenever it decides the car is in reverse. It's handy on engine and transmission swaps, where the factory reverse switch wiring may no longer exist or runs through a module you've removed.
It needs to know you're in reverse
The output can't guess. You must give the VCU some way of detecting reverse gear, and you must enable the reverse switch under the Transmission node. The source can be:
- A wired switch on an analog voltage input (AVI), such as the gearbox's own reverse switch.
- A CAN-based input from another module.
- Gear information from a transmission controller over CAN.
See reverse switch and gear detection to set up the input.
Wiring the lamps
Reverse lamps draw more current than you want through an ECU pin, so drive them through a relay unless you're sure the output can carry the load. The output assignment is covered in reverse lights wiring.
With the engine off and the parking brake set, select reverse and check the lamps and the input channel in NSP together. If the channel doesn't change, the lights never will.
