Checking the function of the steering wheel module (SWM)

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition on.

  Check that the central electronic module (CEM) is powered and grounded by activating the hazard warning signal flasher switch.

  The hazard warning signal flashers must start.

  Check that the steering wheel module (SWM) is powered and grounded by activating the horn. The horn must sound.

  HINT: If the central electronic module (CEM) is powered but the horn does not sound, check the fuse for the power supply relay for the horn in the fusebox in the engine compartment and then try again. 

  Fig 2: Identifying Steering Wheel Module

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Does the horn sound? 

• YES 

  Refer to Checking communication with the steering wheel module (SWM) 

• NO 

  Refer to Checking the power supply and ground for the steering wheel module (SWM) 

HINT: After carrying out the repair, check that the fault has been remedied. 

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Connector(s) Reinstallation

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Reconnect the connectors. Reinstall the components
• Ignition on.

  Check that the central electronic module (CEM) is powered and grounded by activating the hazard warning signal flasher switch.

  Check that the steering wheel module (SWM) is powered and grounded by activating the horn. The horn must sound. Also check that the buttons on the steering wheel are working.

Is the function OK? 

• YES 

  OKAY:  Troubleshooting has been completed.

• NO 

  Refer to Information