2024 BMW X3 / X4 Steering Wheel Heater Inoperative TSB

Symptoms

Owners of 2024 BMW X3 (G01) and X4 (G02) Sports Activity Vehicles may experience an inoperative steering wheel heating system. This means the steering wheel will not warm up when activated, significantly impacting driver comfort, especially in colder climates. This issue, which affects the functionality of the BMW X3 steering wheel heater, is often accompanied by a specific fault code stored in the vehicle's diagnostic system.

Fault Codes / DTCs

When the steering wheel heater is inoperative, the vehicle's Body Domain Controller will likely store the fault code “30490 Missing LIN slave”. This code indicates a communication problem within the LIN (Local Interconnect Network) bus system. Specifically, it means that a component expected to be present and communicating on the LIN bus is not responding correctly, leading to the failure of the steering wheel heating function.

Diagnosis / Trigger Conditions

The root cause for the inoperative steering wheel heater and the “30490 Missing LIN slave” fault code has been identified as a poor electrical connection. This poor contact occurs within the KL31 circuit, which is located at pin 11 of the Steering Wheel Module connector, specifically connector X434*1B. Technicians will typically confirm the presence of the fault code and then perform a visual inspection of this particular connector and pin for any signs of poor contact, corrosion, or damage, as illustrated by the example photo in the bulletin.

Repair Procedure Summary

To resolve the inoperative BMW X3 steering wheel heater and the associated fault code, technicians must perform a targeted wiring repair. The procedure involves accessing the Steering Wheel Module connector X434*1B and carefully inspecting pin 11 for any signs of poor contact. This could include loose connections, corrosion, or physical damage to the terminal.

If poor contact is identified, the technician will repair the wiring as needed. This may involve cleaning the terminal, re-pinning the wire into the connector, or replacing the affected terminal entirely. In cases where the connector itself shows signs of damage or degradation due to the poor contact, the entire connector X434*1B may need to be replaced. The goal is to ensure a robust and reliable electrical connection for the KL31 circuit, thereby restoring proper communication and functionality to the steering wheel heating system.

Owner Action

If you own a 2024 BMW X3 (G01) or X4 (G02) and are experiencing an inoperative steering wheel heater, or if you have had the fault code “30490 Missing LIN slave” diagnosed, it is recommended to schedule an appointment with an authorized BMW dealership. When discussing the issue with your service advisor, reference Technical Service Bulletin 32 03 25, dated March 10, 2025. The dealership will be able to accurately diagnose the specific cause of the problem and perform the necessary wiring repair to restore the functionality of your BMW X3 steering wheel heater.

Source: NHTSA ID: 11015552