Well this is the fix GM has decided to do.
GM Recall #:
N192220470
Transport Canada Recall #:
19988
Date Issued:
Jun 27, 2019
Recall Title:
Power Sliding Rear Window Defroster Failures (Canada Only)
Recall Description:
General Motors has approved a safety recall in Canada for certain 2014-2019 model year Chevrolet Silverado and GMC Sierra vehicles equipped with a power sliding rear window (RPO A48). In some of these vehicles, areas of high electric resistance on the rear defroster circuit, caused, in part, by mechanical stress from opening and closing the rear power window, intrusion of debris, and use of the rear defroster may, over time, generate heat which could melt the areas surrounding the circuit. In rare instances, this heat could cause a non-propagating fire, increasing the risk of property damage or injury.
Safety Risk Description:
In some of these vehicles, areas of high electric resistance on the rear defroster circuit, caused, in part, by mechanical stress from opening and closing the rear power window, intrusion of debris, and use of the rear defroster may, over time, generate heat which could melt the areas surrounding the circuit.
Repair Description:
Dealers will replace the buss bar covers and the contact cover, and for certain vehicles, will reprogram the HVAC calibration to disable the rear defroster from automatically turning on at keyed start. Please note that the rear defroster will automatically turn on during remote start or by pushing the manual button and is not affected by this calibration. If the rear window or sliding glass assembly appears damaged due to an occurrence of high electrical resistance on the rear defroster circuit, they will also be replaced.