Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Steering Column Switch: Introduction
For the first time on a BMW, the E87 steering column switch cluster (SZL) will optically record the steering angle and the positions of the steering column stalks.
With a conventional steering column stalk the electrical contacts are mechanically switched and thus influence the pressure points felt by the driver.
The benefit of optical monitoring is that it allows these pressure points to be more precisely defined. In other words, optical monitoring greatly reduces the level of mechanical influence.
- E70, E71:
- E81, E82, E87, E90, E91, E92, E93:
The steering column switch cluster (SZL) has the following tasks:
- Measuring the steering angle and steering-angle speed
- Picking up signals from controls in the multi-function steering wheel via coil springs
- Picking up signals from the steering column stalks
- Sending data as CAN messages on the BUS or via direct wires
- Looping signals through (e.g. driver's airbag and horn)
NO RELATED
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.