So it's been reported back in March 2016 regarding this issue::surprise:
Steering Column Wiring Harness Incorrectly Routed
Report Receipt Date: MAR 10, 2016
NHTSA Campaign Number: 16V146000
Component(s): ELECTRICAL SYSTEM , STEERING
Potential Number of Units Affected: 888
Manufacturer: Mercedes-Benz USA, LLC.
Mercedes-Benz USA, LLC (MBUSA) is recalling certain model year 2016 GLC 300 vehicles manufactured June 16, 2015, to November 3, 2015, and 2016 GLC 300 4Matic vehicles manufactured July 16, 2015, to November 3, 2015. The steering columns in the affected vehicles may have the wiring harness for the switch module incorrectly routed. As a result, the harness may chafe and the air bag may unexpectedly deploy or the engine may stall.
An unexpected air bag deployment or engine stall increases the risk of a crash.
MBUSA will notify owners, and dealers will inspect the wiring harnesses, properly rerouting them as necessary. Any damaged harnesses will be replaced. These repairs will be performed free of charge. The recall is expected to begin in April 2016. Owners may contact MBUSA customer service at 1-800-367-6372.