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Reversing lights, detailed description

Reversing lights, detailed description

The reversing lights are located in the light clusters. The fuse box in the luggage compartment receives a bus message on the current gear and lights the reversing lights when reverse gear is engaged.


Manual gearbox

Pin 1 of the reversing light switch (31) is connected to pin 9 (M) of the Underhood Electrical Centre, UEC; (342). Pin 2 of the reversing light switch is connected to ground. When the gear selector is shifted to "R", the reversing light switch (31) closes and UEC pin 9 is grounded. UEC sends the bus message "Reverse gear, manual ON". If the ignition is on, REC (701) will feed B+ on pin 1 (T-C) and pin 11 (T-B) to pin 1 of the left or right reversing light (32/418HL or 32/418HR, respectively). Both light clusters (418HL/HR), in which the reversing lamps are located, are connected to ground on pin 2.


Automatic Transmission

The transmission range switch (245) is connected to TCM (502). When the selector lever is shifted to "R", RCM (502) receives information on the current selector position. TCM (502) sends the bus message "Automatic selector lever position R". If the ignition is on, REC (701) will feed B+ on pin 1 (T-C) and pin 11 (T-B) to pin 1 of the left or right reversing light (32/418HL or 32/418HR, respectively). Both light clusters (418HL/HR), in which the reversing lamps are located, are connected to ground on pin 2.


Reversing light activation is delayed 320 ms so the light does not flash when the gear selector is shifted from "P" to "D" or the like.

Important

When changing a bulb, use one with the right output otherwise the components could be damaged.