Diagnostic Trouble Code (DTC) Information SWM-E001: Notes

Condition

Fig 1: Identifying Steering Wheel Module (SWM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The control modules transmit and receive information via a standardized serial communication method - CAN (Control Area Network). The diagnostic trouble code (DTC) is stored if the steering wheel module (SWM) registers serious interference on the low speed network (CAN communication blocked).

NOTE:

In the event of a system communication fault it is not possible to communicate with the steering wheel module (SWM). Therefore it will only be possible to read off the diagnostic trouble code (DTC) if the fault is intermittent.

Substitute Value

The steering wheel module (SWM) shuts itself off ("bus-off").

HINT: The steering wheel module (SWM) will remain shut off until the power supply is broken (15, 30, X). When the power supply is connected the steering wheel module (SWM) will make a new attempt to communicate.

Possible Source

Short-circuit between the control area network (CAN) wiring
Open-circuit in the control area network (CAN) wiring
Internal fault in the steering wheel module (SWM)
Internal fault in another control module in the same part of the control area network (CAN).

Fault symptom[s]

The turn signal lamp switch does not work
The radio buttons on the steering wheel do not function
The RTI buttons on the steering wheel do not function
The carphone buttons on the steering wheel do not function
The windshield wiper only operates at low speed
The reset button communication with the trip computer does not function
Messages cannot be removed from the driver information module (DIM)
Front windshield washing does not work
Rear windshield washing does not work
No rain sensor function.