How It Works
WARNING: This page does not describe the selected car, but rather 46 other vehicles, including the 2008 BMW M5, 2008 BMW 650i, 2007 BMW Z4, 2007 BMW M6, and 2007 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.
The signal paths on the E60, E61, E63, E64 are different from those on the E90 as follows:
E60, E61, E63, E64
- Dual transmission of turn signal. The turn signal is transmitted autonomously (twice):
- A message is transmitted through the data buses to the light module.
Signal path: Steering column switch cluster -> byteflight data bus -> Safety and gateway module -> K-CAN data bus -> Light module
- A direct wire from the steering-column stalk to the light module (E90: footwell module) transmits the turn signal a second time.
- A message is transmitted through the data buses to the light module.
- Function limitations in the event of a failure of one or both data buses:
- Main-beam headlights and the headlight flasher only work if the steering-column stalk is held.
- The direction indicator only works if the steering-column stalk is held.
- No hazard warning lights in the event of an accident or when the anti-theft alarm system is primed.
This makes the turn signal independent of the data buses.
E90
- Direct wire from light switch and steering column switch cluster to the footwell module.
- The light switch and the turn-signal/main-beam switch have a direct wire to the footwell module (FRM). The position of the turn-signal/main-beam switch is optically transmitted to the steering column switch cluster (SZL). The signal is transmitted by a direct wire from the steering column switch cluster to the footwell module (FRM).