LED exchange
Changing the rear/brake lights for LED is not entirely without problems.
If you only exchange the two low rear/brake light bulbs for LED you will see the "bulb failure" warning come up every time you brake. You have disturbed the OS light / NS + high level light balance.
If you also exchange the high level brake light bulb for LED the balance is restored again, so no "bulb failure" warning, but you will probably find the ABS and Cruise control are not working anymore.
It may sound strange, but both systems send a low amp signal via the filament of the brake light bulb to ground. When braking, this signal is counteracted by the 12V feed to the bulbs, telling CC and ABS the brakes are applied. A LED does not have a filament, so the low amp signal during non-braking cannot find ground and CC and ABS will not work. With some LEDs this low amp signal is powerful enough to even cause them to light up, as they use far less energy than a normal bulb.
The filament of one bulb is already sufficient to activate the ABS and CC, so not exchanging the high level light will overcome the non-working ABC/CC problem.
I am still thinking about how to solve this, but have not yet found a good solution.
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