Fault symptoms

The horn does not work and there is no diagnostic trouble code.

Some of the steering wheel control buttons do not work, no diagnostic trouble code.

Fig 1: Circuit Diagram - Steering Wheel Switch Unit Failure (1 Of 2)

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Circuit Diagram - Steering Wheel Switch Unit Failure (2 Of 2)

Courtesy of SAAB-SCANIA OF AMERICA, INC.