Sunroof or Sunshade Inoperative, DTC U1S1B Set – 2010-2014 Buick LaCrosse, 2011-2014 Buick Regal, 2012-2014 Buick Verano, 2011-2014 Chevrolet Cruze, 2013-2014 Chevrolet Malibu, 2014 Chevrolet Impala Equipped with Sunroof

Preliminary Information Bulletin

This bulletin concerns sunroofs or sunshades that may be inoperative when the sunroof switch is pressed. The computer may report a DTC U1S1B. GM Engineering is attempting to determine the root cause of this issue.

Resolution

Follow these steps to resolve the concern:

1. Remove the sunroof fuse for 10 seconds.

2. Install the sunroof fuse.

3. Using the first detent on the sunroof glass switch, open and close the sunroof glass fully.

4. If equipped, using the first detent on the sunroof sunshade switch, open and close the sunroof sunshade fully.

5. Verify that the sunroof glass and sunshade (if equipped) now functions properly.

Contact Information

Contact Technical Assistance (TAC) for further direction or to coordinate an engineering visit to the vehicle while the condition is present.

Manual:

Download: Sunroof or Sunshade Inoperative, DTC U1S1B Set – 2010-2014 Buick LaCrosse, 2011-2014 Buick Regal, 2012-2014 Buick Verano, 2011-2014 Chevrolet Cruze, 2013-2014 Chevrolet Malibu, 2014 Chevrolet Impala Equipped with Sunroof

Chat: Powered By VoiceSphere