VOLVO
SWM-0021 - Scan- button. Activated for long time. Intermittent fault
System
Steering Wheel Module (SWM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
What does this fault code mean?
At some point the steering wheel module (SWM) has registered that the Scan- control was activated for too long. The fault is intermittent, meaning it has occurred but may not be present now. Station settings can then change by themselves, without the scan+ or scan- buttons being pressed.
Possible causes
- The Scan- control has been activated for too long
What you can do
- 1Read and note the code, clear it and road test to see whether it returns
- 2Check that none of the buttons on the audio and phone switch stick or stay in the pressed position
- 3If you have a diagnostic tool: read the status of all buttons on the audio and phone switch in live data and check whether any shows active without being pressed
- 4If the code does not return, no further action is needed
- 5If the fault returns, have a workshop determine whether it sits in the switch or in the wiring between the switches
Symptoms you may notice3
- Station settings change by themselves without the scan+ or scan- buttons being pressed
- The steering wheel radio controls do not work
- The carphone does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.