GM Class2 Data OnStar, RSE, Chime Retention Interface Harness
The GMOS-014 is designed to retain OnStar, Rear Seat Entertainment (RSE), and retain the warning chimes that are normally lost when the OEM radio is removed. It also provides a 12 volt accessory output for aftermarket radio operation. The GMOS-014 also provides a Mute, Parking Brake, VSS or Speed Sense, and Reverse outputs to make installing an aftermarket navigation radio simple and less time consuming.
Provides accessory (12 volt 10 amp)
Retains R.A.P. (Retained Accessory Power)
Used in amplified or non-amplified systems
Provides NAV outputs (Parking Brake, Reverse, Mute, and V.S.S.)
ASWC harness included (ASWC not included)
Retains OnStar/ OE Bluetooth
Adjustable volume for chimes and OnStar
High level speaker input
Retains balance and fade
Escalade EXT 2003-06
Malibu Classic 2004
Monte Carlo 2000-05
Silverado Classic 2007
Sierra Classic 2007
I Series 2006-08
Grand Am 2001-05
Grand Prix 2004-08
Sunfi re 2000-05
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.
Connect the Yellow wire to the 12 volt constant/battery
wire of the aftermarket radio
Connect the Black wire to the ground wire of the
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/
Connect the Blue/Black wire to the Amp turn on
wire of the aftermarket radio. If the vehicle does not
have RSE, tape off the Blue/Black wire.
Connect the Black wire with the ring terminal to the
radio chassis with ISO screw that is supplied with radio
The Black/Yellow wire and additional 12 pin harness
will be discussed later in this manual
Connect the RCAs to the AUX in of the aftermarket
radio. This is only used if the vehicle has Rear Seat
Chime Volume Adjustment
To adjust the chime volume, use a small screwdriver to
rotate the potentiometer, located on the 16 pin harness
side of the interface, clockwise to make the chime
louder and counterclockwise to make the chime softer.
Onstar Level Adjustment
To adjust the Onstar volume level find the Black/Yellow
wire on the 22 pin harness. Push the blue Onstar
button, while the voice is speaking tap the Black/Yellow
wire to ground. There are 4 volume settings for Onstar;
once the 4th setting is reached and the Black/Yellow
wire is tapped to ground it will automatically go back to
the first volume setting. Once the volume is set it will
stay at that volume until the Black/Yellow wire is tapped
to ground again.
This can be set during installation and then left alone. If
user adjustment is desired, the customer may also tap
volume up or down on the steering wheel (if equipped)
to adjust the Onstar level.
top of page