Steering Mounted Controls Assembly: Description and Operation

Multifunction Steering Wheel

CAUTION!
• Disconnect battery ground wire before working on electrical system.

• On vehicles with Telematics, activate Telephone/Telematics Control Module (J526) service mode before disconnecting Battery (A) => [ Telematics Service Mode, Activating/Deactivating ] Procedures.

If the Battery (A) is reconnected, follow the procedure for disconnecting and connecting the Battery (A) Deactivate Telephone/Telematics Control Module (J526) service mode => [ Telematics Service Mode, Activating/Deactivating ] Procedures.

Description

Six function buttons are integrated in the steering wheel to facilitate radio and telephone operation when driving. In addition, multi-function steering wheel is heated electrically.

The electronics installed in the steering wheel converts button signals to the LIN data bus (single wire bus) and dims function buttons. On vehicles with automatic transmission, 2 additional switches can be installed for Tiptronic. The electronics in the steering wheel cannot be replaced individually. In case of faulty electronics, the entire steering wheel must be replaced.

The multi-function steering wheel is part of the complete " Steering column switch module" (SMLS) system and delivers data via the LIN data bus to the Steering Column Electronic Systems Control Module (J527).

Diagnosis is performed using "Guided Fault-Finding".

Repair to CAN bus lines => Electrical Equipment - General

Information 97 Removal and Installation.