
Originally Posted by
gghaggis
The D4 doesn't need a shunt box to prevent the LED lights from 'pulsing' - the test signal now accounts for LED lights, as it has them fitted to the car itself.
However, it still needs the shunt (or some form of load) to be able to sense the trailer/caravan and activate trailer stability and cut the rear parking sensors. If your rear sensors are cutting out, then the system is probably working. The trailer icon on the dash seems to vary in reliability from car to car. I had one client's car where it never activated, a couple where it functioned as per the handbook, and mine which only flashes with the LHS indicator. But in all cases the rear sensors are cut-off, and that could only occur if the car sensed the trailer load.
As a further test, with the trailer hooked up, in low range select sand or mud/ruts mode and see if the car automatically raises to off-road height - it shouldn't.
Cheers,
Gordon
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