• Connect the Purple wire to the radio's right rear positive speaker output.
• Connect the Purple/Black wire to the radio's right rear negative
speaker output.
• Connect the Blue/White wire to the radio's amp turn on wire (this wire must be
connected to hear sound from the factory amplifier).
• 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 (note, if
the mute wire is not connected, the radio will turn off when OnStar is active).
The following wires are for aftermarket radios that have navigation built in:
• 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.
GMOS-04
Connections to be made
• Plug the 16-pin harness into the GMOS-04.
From the 24-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 18-pin harness into the GMOS-04.
• The Black/Yellow wire is for the OnStar volume adjustment. This will be
The 12-pin harness (ASWC-1 plug) will be discussed later in the manual.
3
discussed in the OnStar Level Adjustment section of this instruction.