GMOS-LAN-07
3
• With all connections completed to the aftermarket radio, plug the 44-pin
harnesses into the vehicles wiring harnesses.
• Reconnect the negative battery terminal.
• Cycle the key, by turning the ignition on for 30 seconds. Then off and on again
to test the radio.
Installing the GMOS-LAN-07
1) Turn the ignition on if not already, and then turn the radio on to verify that the
radio works. Check balance and fader controls for proper operation.
2) Push the Onstar button (if equipped) to verify Onstar is working. The radio
will shut off or mute, depending if the
Brown
wire on the 16-pin harness is
connected, and Onstar will be heard through the front speakers. Turn off Onstar
and the radio will turn back on.
Chime volume adjustment
Note: If Y91 is present on the RPO list, refer to your owner’s manual to
adjust chimes.
1) With the key out of the ignition and
door open turn on your headlights.
The chimes should start chiming.
2) Wait 10 seconds, then with a small
screwdriver adjust the potentiometer
clockwise to raise chime level and
counterclockwise to lower the chime
level.
3) When the volume is at the desired
level turn off your headlights. This
will lock the chime volume at its
current level.
Continued on back page
Testing the GMOS-LAN-07
Connections to be made
From the 44-pin harness:
• Connect the
Yellow
wire to the radio’s 12-volt battery or memory wire.
• Connect the
Black
wire to the radio’s ground wire.
• Plug the 14-pin harness into the GMOS-LAN-07.
• The
Black/Yellow
wire is for the OnStar volume adjustment. This will be
discussed in the OnStar Level Adjustment section of this instruction.
The 12 pin harness (ASWC plug) will be discussed later in the manual.
Potentiometer located
on 16-pin side of the
interface
