ADJUSTING THE GMOS-LAN-09
Chime Volume Adjustment
• With the vehicle on, turn it off and leave the key in the
ignition. Open the driver's door; chimes will be heard.
• Wait 10 seconds, and then with a small flat-blade
screwdriver, turn the potentiometer clockwise to raise
the chime level; counterclockwise to lower the chime
level.
Note: The potentiometer is located on the side of the
interface where the 16-pin harness with stripped leads is
connected to.
• When the chime level is at a desired level, remove the
key from the ignition. This will lock the chime volume at
its current level.
AxxessInterfaces.com
OnStar Level Adjustment
• Press the OnStar button to activate it.
• While OnStar is speaking, press the VOLUME UP or
VOLUME DOWN buttons on the steering wheel to raise or
lower the OnStar level.
• If the vehicle does not come equipped with steering
wheel controls, find the Black/Yellow wire on the 22-pin
harness.
• While OnStar is speaking, tap the Black/Yellow wire to
ground. Once the OnStar level is set, it will stay at that
level until the Black/Yellow wire is tapped to ground
again.
© COPYRIGHT 2017 METRA ELECTRONICS CORPORATION
GMOS-LAN-09
I N S TA L L AT I O N I N S T R U C T I O N S
IMPORTANT
If you are having difficulties with the installation of this product,
please call our Tech Support line at 1-800-253-TECH. Before doing
so, look over the instructions a second time, and make sure the
installation was performed exactly as the instructions are stated.
Please have the vehicle apart and ready to perform troubleshooting
steps before calling.
K
®
NOWLEDGE IS
Enhance your installation and fabrication skills by
enrolling in the most recognized and respected
mobile electronics school in our industry.
Log onto www.installerinstitute.com or call
800-354-6782 for more information and take steps
toward a better tomorrow.
Metra recommends MECP
certified technicians
REV. 9/8/17 INSTGMOS-LAN-09
P
OWER