Axxess GMOS-13 Installation guide

Brand: Axxess

Model: GMOS-13

Category: Motorcycle Accessories

Type: Installation guide

Axxess GMOS-13 is a Cadillac STS OnStar interface designed for 2005-2010 models with amplified systems. It retains warning chimes, provides 12V switched accessory output, and offers mute, parking brake, speed sense (VSS), and reverse outputs for aftermarket navigation radio installation. Adjust audio and OnStar levels, and customize volume settings with a momentary contact switch (sold separately). Enhance your car audio system while maintaining essential features with the GMOS-13.

REV. 1/07/2010

1-800-221-0932 1-800-221-0932

axxessinterface.com axxessinterface.com

CADILLAC STS ONSTAR INTERFACEGMOS-13GMOS-13

GMOS-13

APPLICATIONS

INTERFACE COMPONENTS

TOOLS REQUIRED

INSTALLATION INSTRUCTIONS

The GMOS-13 is designed to be used in

the 2005-10 Cadillac STS equipped with

Onstar and amplied system. It will retain

the warning chimes that are lost when the

factory radio is removed. The GMOS-13

also provides a 12-volt switched accessory

output along with Mute, Parking Brake,

Speed Sense (VSS), and Reverse outputs

for the installation of an aftermarket navi-

gation radio.

GMOS-13•

14 pin harness with RCA’s•

16 pin harness to Cadillac harness•

• Cutting tool • Crimping tool • Tape

• Connectors (ex: butt-connectors, bell caps, etc…)

Cadillac STS 2005-10

AUDIO LEVEL ADJUSTMENT

While using the GMOS-13, if the audio is distorted there is

a level adjustment on the interface.

Locate the potentiometer next to the 14-pin connector 1.

located on the GMOS-13.

Taking a small at headed screwdriver, turn the po-2.

tentiometer counter-clockwise to lower the input level

going to the factory amplier.

To adjust the audio level follow these steps:

**Note: The chime volume will also adjust with the audio

level.

POTENTIOMETER

KNOWLEDGE IS POWER

Enhance your installation and fabrication skills by

enrolling in the most recognized and respected

mobile electronics school in our industry.

Log onto www.installerinstitute.com or call

800-354-6782 for more information and take steps

toward a better tomorrow.

Metra recommends MECP

certied technicians.

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, a momentary con-

tact switch (sold separately) can be added. Connect one

terminal from the switch to ground and the other terminal

to the Black/Yellow wire. The volume will change one level

every time the switch is pressed.

GMOS-13

1 2 3

WIRING CONNECTIONS

INSTALLING THE GMOS-13

TESTING THE GMOS-13

ONSTAR LEVEL ADJUSTMENT

*Important: Before beginning any of the

following, disconnect the negative battery

terminal to prevent an accidental short

circuit.

**Note: The ignition power source of the

Cadillac keeps the radio on until one of the

doors is opened. This is called the R.A.P.

(retained accessory power). The GMOS-13

is designed to retain this feature.

Connections to be made on the 14 pin harness

with RCA’s:

Connections to be made on the primary 16-pin to

Cadillac harness:

Connections to be made on the secondary 16 pin

to Cadillac harness:

The following wires on the 14-pin harness are for

aftermarket radios equipped with media / naviga-

tion features:

Connect the white RCA to the radio’s left front RCA 1.

output.

Connect the gray RCA to the radio’s right front RCA 2.

output.

Connect the green RCA to the radio’s left rear RCA3.

output.

Connect the violet RCA to the radio’s right rear RCA 4.

output.

Connect the blue/white wire to the radio’s amplier 5.

turn-on output.

Connect the red wire to the radio’s 12-volt accessory 6.

or switched wire.

Turn the ignition then the radio on to verify that the 1.

radio works. Check the balance and fade control of the

radio for proper operation.

Push the Onstar button, if so equipped, to verify On-2.

star is working properly. The radio will turn off or mute

(If the Mute wire is connected) and Onstar will be heard

through the front speakers. Turn off Onstar and the

radio will turn back on or un-mute if connected.

To adjust the Onstar volume level nd the Black/Yellow

wire on the 16-pin harness. Push the blue Onstar but-

ton, while the voice is speaking tap the Black/Yellow wire

to ground. There are 31 volume settings for Onstar; once

the 31st setting is reached and the Black/Yellow wire is

tapped to ground again it will automatically go back to

the rst volume setting. Once the volume is set it will stay

Connect the Brown wire to the mute wire of the after-1.

market radio.

Connect the Green wire to the parking brake wire of 2.

the aftermarket radio.

Connect the Blue/Pink wire to the VSS or speed sense 3.

wire of the aftermarket radio.

Connect the Green/Purple wire to the reverse wire of 4.

the aftermarket radio.

Connect the Yellow wire to the radio’s 12-volt battery 1.

or memory wire.

Connect the Black wire without the ring terminal to the 2.

radio’s ground wire.

Connect the Black wire with the ring terminal to the 3.

radio’s chassis.

When completed plug the 14-pin harness into the

GMOS-13.

Connect the blue wire to the red accessory wire of the 1.

14-pin harness.

The Black/Yellow wire will be discussed later in this manual.

When completed, plug the 16-pin harness into the

GMOS-13.

**Note: If no RCA outputs are available, use the Axxess line

output converter part # ALOC648 (sold separately).

With all connections completed to the aftermarket 1.

radio, plug the GMOS-13 into the Cadillac’s wiring

harness.

Cycle the key by turning the ignition on then back off, 2.

then on again to test the radio.

**Note: Some minor modiﬁcations may be necessary to the

sub dash cavity to accommodate the GMOS-13.

**Note: First generation harness’ had this wire permanently

attached. If so, cut that wire in half. The side that goes

towards the GMOS-13 will now be an illumination wire.

Follow the above step for the side going towards the sec-

ondary 16 pin harness. Also, cap off the orange illumination

wire on pin 12.

Axxess GMOS-13 Installation guide

Brand: Axxess

Model: GMOS-13

Category: Motorcycle Accessories

Type: Installation guide

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Axxess GMOS-13 Installation guide

Axxess GMOS-13 Installation guide

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