
METRA. THE WORLD’S BEST KITS.™
© COPYRIGHT 2004-2011 METRA ELECTRONICS CORPORATION
1-800-221-0932
metraonline.com
INSTALLATION INSTRUCTIONS FOR PART INSTGMOS-05
REV. 12/21/11
Cutting Tool • Crimping Tool • Tape • Connectors (example: butt-connectors, bell caps, etc.
IGNITION
TERMINALS
WIRE
CUTTER
M3.5
M2.6
M3
M5
M4
ISO
6
2.5
1.5
TOOLS REQUIRED
GM non-amplified OnStar Class II Data
Bus Interface 2000-2004
GMOS-05
GMOS-05 interface • 16-pin harness with stripped leads
14-pin harness to 32-pin GM harness with stripped leads
INTERFACE COMPONENTS
KIT FEATURES
APPLICATIONS
• Provides accessory (12-volt 10-amp)
• Retains R.A.P. (Retained Accessory Power)
• Used in non-amplified systems or when replacing amplified systems
• Retains chimes
• Provides NAV outputs (Parking Brake, Reverse, Mute, V.S.S.)
• ASWC harness included (ASWC not included)
• Retains OnStar/OE Bluetooth
• Adjustable volume for chimes and OnStar
• High level speaker input
• USB updatable
• Retains balance and fade
See inside front cover

Applications
GMOS-05
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.
*NOTE: Refer also to the instructions included with the aftermarket radio.
BUICK
Le Sabre 2000-2004
00-2005
OLDSMOBILE
Aurora 2001-2003
PONTIAC
Bonneville 2000-2004
(Note: This interface will also work in vehicles listed below that are not equipped with OnStar)

From the 16-pin harness:
• Connect the Red wire to the ignition wire of the aftermarket radio
• Connect the Orange/White wire to the illumination wire of the aftermarket radio. If the
aftermarket radio has no illumination wire just tape off the Orange/White wire.
• Connect the White wire to the left front positive speaker output of the aftermarket radio
• Connect the White/Black wire to the left front negative speaker output of the
aftermarket radio
• Connect the Gray wire to the right front positive speaker output of the aftermarket radio
• Connect the Gray/Black wire to the right front negative speaker output of the
aftermarket radio
• Connect the Brown wire to the mute wire of the aftermarket radio. If the aftermarket
radio does not have a Mute wire, tape up the Brown wire.
• Connect the Light Green wire to the parking brake wire of the aftermarket
navigation radio.
• Connect the Blue/Pink wire to the VSS or speed sense wire of the aftermarket
navigation radio.
• Connect the Green/Purple wire to the reverse wire of the aftermarket navigation radio.
• Plug the 16 pin harness into the GMOS-05
3
Connections to be made
GMOS-05