When reverse gear is engaged, the gearbox-mounted reverse light switch closes an electrical circuit that illuminates the white reversing lamps at the rear of the vehicle, alerting pedestrians and other drivers to rearward movement. The switch is typically threaded directly into the gearbox casing and operates via a mechanical plunger or a magnetic reed contact triggered by the selector mechanism. Failure usually occurs through one of two modes: either the switch body leaks gearbox oil past a degraded thread seal, leaving an oily stain around the gearbox casing, or the internal contacts corrode and the circuit opens permanently, leaving the reversing lamps dark even with reverse engaged. On vehicles with parking sensors or reversing cameras that are activated by the same circuit, a failed reverse light switch simultaneously disables the parking assistance system, making the fault more apparent. The switch also feeds the reverse input of some gearbox control modules, which can log a fault code. Thread pitch and connector type are specific to each gearbox variant, making the OE reference the precise identifier for fitment. FACET and Meat & Doria supply a broad range of reverse light switches covering Volkswagen, Renault, Peugeot, Ford, and Citroรซn applications across their catalogues.
The reverse light switch is gearbox-specific, not vehicle-model-specific. The same car sold with a five-speed and a six-speed gearbox will require different switches with different thread sizes, seal types, and connector plugs. Use your gearbox code โ usually found on a sticker on the gearbox casing or in the service history โ as well as the model year to identify the correct TecDoc OE reference on this page. The thread diameter (typically M10, M12, or M16) and the number of pins on the electrical connector are the two physical dimensions to verify.
A reverse light switch closes the circuit specifically when reverse gear is selected, powering the reversing lamps. A neutral safety switch (fitted to automatic gearboxes and some manual transmissions) prevents the engine from starting unless the gearbox is in neutral or park. On manual gearboxes the two functions are sometimes combined in a single multi-position switch, and on others they are separate components. The OE reference distinguishes between these configurations โ fitting a neutral safety switch in place of a reverse light switch would leave the reversing lamps inoperative.
Yes. Disconnect the switch connector with the ignition on and bridge the two terminals with a short length of wire. If the reversing lamps illuminate, the switch has failed open-circuit and requires replacement. If the lamps remain dark with the terminals bridged, the fault lies elsewhere โ a blown fuse, a broken wiring loom, or a failed lamp. If the lamps work in reverse with the bridged wire but the switch tests as having continuity with a multimeter, the switch contact resistance may be high enough to be intermittent under real-world current.
The most obvious symptom is reversing lamps that no longer illuminate when reverse gear is selected. On modern cars with rear parking sensors or a reversing camera triggered by the reverse light circuit, those systems will also stop functioning. An oil leak around the switch body โ visible as a damp patch on the side of the gearbox casing near the switch โ indicates the thread seal has failed and the switch should be renewed before the leak worsens. In rare cases, a faulty switch can cause a gearbox control module to log a fault code for an unrecognised selector position.
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