Page 2
GMOS-LAN-04 Applications (Note: This interface will also work in vehicles listed below that are not equipped with OnStar) CHEVROLET SATURN PONTIAC Caution: Metra recommends disconnecting the negative battery terminal before beginning any installation. All accessories, switches, and especially air bag indicator lights must be plugged in before reconnecting the battery or cycling the ignition.
GMOS-LAN-04 Connections to be made From the 16-pin harness: Orange/White Orange/White White White/Black Gray Gray/Black Green Green/Black Purple Purple/Black Blue/White Brown Brown Light Green Blue/Pink Green/Purple...
Page 4
GMOS-LAN-04 Connections to be made From the 30-pin harness: Yellow Black Black/Yellow Installing the GMOS-LAN-04 Testing the GMOS-LAN-04 Brown Continue on next page...
Page 5
GMOS-LAN-04 Chime Volume Adjustment Note: If Y91 is present on the RPO list, refer to your owner’s manual to adjust chimes. Potentiometer located on 16 pin side of the interface Audio Level Adjustment OnStar Level Adjustment Black/Yellow Black/Yellow Black/ Yellow...
INSTALLATION INSTRUCTIONS FOR PART INSTGMOS-LAN-04 IMPORTANT WARNING you should consult a technician who does have this knowledge and understanding. Failure to follow these instructions carefully and to install the interface as described could cause harm to the vehicle or to safety systems on the vehicle.