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In this guide, we take a look at the functions of the center console switch cluster (SZM) used to adjust the steering column and how to diagnose the SZM module with an OBD-II diagnostic scanner.

Table of Contents


What is the BMW SZM switch?

Centre console switch cluster (SZM).

Steering column adjustment is on the left-hand side of the steering column.

SZM is the BMW term for Centre Console Switch Cluster. When the driver adjusts, the steering column signal is sent to the steering column switch cluster (SZL), which controls the steering column motor.

If your BMW SZM module fails, you may notice that you can no longer adjust the steering wheel.

Diagnose BMW SZM switch problems

If you are experiencing problems, a good starting point is to read fault codes from the SZM module.

What you will need

For this step, you will need a diagnostic scanner that is capable of reading, clearing codes from the BMW SZM module.


  1. Plugin the OBD-II scanner into the diagnostic port under the dashboard.diagnose bmw SZM fault code via obd2 port
  2. Turn on the ignition; don't start the engine.turn on bmw ignition to read SZM fault codes
  3. Turn on the scanner and select your BMW chassis. Next, Select the Control Units SZM control unit module reading codes
  4. Select the SZM control unit list
  5. Once you enter the SZM module, you will be able to do the following.
    • Read Codes from SZM Module
    • Clear Codes from SZM Module
    • Perform Adaptations, Activations, Tests
  • If any code shows PRESENT status, the problem needs to be fixed before the code can be cleared.
  • Note that the SZM is connected to the IHR/IHKR/IHKA control unit via a 14-pin connector.
  • When purchasing a BMW scanner, verify that the supports your BMW model and year.