Quote Originally Posted by Xtant12 View Post
Hello guys, my drivers side mirror does nothing at all. I put it in reverse and it wont flip down, I try to adjust it and nothing happens. I checked the fus and it was fine. Pass mirror works well. Any ideas???
Xtant12, you have an '08 CTS with the Park Tilt Mirror feature? Have you checked your settings in "DIC Vehicle Customization"?

If your driver's side mirror doesn't adjust at all with the controls then there may be a problem with:
• the driver door switch assembly (DDSA)
• the driver door module (DDM)
• the transmission of serial data between the DDSA and DDMs (there are 2 DDMs in the door to control the mirror)
• the mirror motors (there are 2 motors in the mirror assembly)

From the CTS service manual:

Outside Mirror System Components
The power outside rearview mirror system consists of the following components:
• Driver door switch assembly (DDSA)
• Driver door module (DDM)
• Passenger front door module (PDM)
• Driver outside mirror
• Passenger outside mirror
• Serial data

Outside Rearview Mirror Operation
The outside rearview mirrors are controlled by the driver door switch assembly (DDSA) which contains the mirror control switches, the driver door module (DDM), and the front passenger door module (PDM). The DDSA decodes mirror control switch activations while the door modules apply battery voltage and ground to their respective mirror motors to move the mirrors to the desired positions.


Copy/paste from the '08 CTS Owner's Manual:

Park Tilt Mirrors

If your vehicle has this feature, it allows you to select
whether or not the outside mirror(s) will automatically tilt
down when the vehicle is shifted into REVERSE (R).
See Park Tilt Mirrors on page 2-50 for more information.

Press the customization button until Park Tilt Mirrors
appears on the DIC display. Press the set/reset button
once to access the settings for this feature. Then
press the menu up/down button to scroll through the
following settings:

Off (default): Neither outside mirror will be tilted down
when the vehicle is shifted into REVERSE (R).

Driver Mirror: The driver’s outside mirror will be tilted
down when the vehicle is shifted into REVERSE (R).

Passenger Mirror: The passenger’s outside mirror will
be tilted down when the vehicle is shifted into
REVERSE (R).

Both Mirrors: The driver’s and passenger’s outside
mirrors will be tilted down when the vehicle is shifted into
REVERSE (R).

No Change: No change will be made to this feature.
The current setting will remain.

To select a setting, press the set/reset button while the
desired setting is displayed on the DIC.