2. Axxess
  3. GMOS-MOST-01

Axxess GMOS-MOST-01 Installation guide

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Installation instructions for GMOS-MOST-01
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 to the instructions included with the
aftermarket radio.
• Providesaccessorypower(12-volt10-amp)
• RetainsR.A.P.(retainedaccessorypower)
• RetainsOnStar/OEBluetooth
• Retainswarningchimes
• ProvidesNAVoutputs(mute/parkingbrake/reverse/speedsense)
• PrewiredASWC-1harness(ASWC-1soldseparately)
• Retainsfactory3.5AUX-IN
• UsedinMOST®amplifiedapplications
• Adjustablegaincontrolforoverallvolume
• Highlevelspeakerinput
• Retainsbalance
• MicroBUSBupdatable
FEATURES
• Cuttingtool•Crimpingtool•Tape•Connectors
(example:butt-connectors,bellcaps,etc.)
TOOLS REQUIRED
GMOS-MOST-01
GM 2014-up MOST®
Amplifier Interface
• GMOS-MOST-01interface•GMOST-MOST-01
harness•16-pinharnesswithstrippedleads
INTERFACE COMPONENTS
APPLICATIONS
CHEVROLET
Silverado1500 2014-up
Silverado2500/3500 2015-up
Suburban 2015-up
Tahoe 2015-up
PONTIAC
Sierra1500 2014-up
Sierra2500/3500 2015-up
GMOS-MOST-01
From the 16-pin harness to the aftermarket radio:
• Connectthe(2)Redwirestotheaccessorywire.
Note: If using the optional ASWC-1 or AX-LCD, there will be an accessory wire
there to connect as well.
• ConnecttheOrange/Whitewiretotheilluminationwire.(Iftheaftermarket
radiohasnoilluminationwire,tapeofftheOrange/Whitewire).
• ConnecttheBlue/Whitewiretothe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radio
hasnomutewire,tapeitoffanddisregardit.
• ConnecttheWhitewiretotheleftfrontpositivespeakeroutput.
• ConnecttheWhite/Blackwiretotheleftfrontnegativespeakeroutput.
• ConnecttheGraywiretotherightfrontpositivespeakeroutput.
• ConnecttheGray/Blackwiretotherightfrontnegativespeakeroutput.
• ConnecttheGreenwiretotheleftrearpositivespeakeroutput.
• ConnecttheGreen/Blackwiretotheleftrearnegativespeakeroutput.
• ConnectthePurplewiretotherightrearpositivespeakeroutput.
• ConnectthePurple/Blackwiretotherightrearnegativespeakeroutput.
Thefollowing(3)wiresareforaftermarketmultimedia/navigationradiosthat
providethesewires(ifnotrequired,tapethemoffanddisregardthem):
• ConnecttheLight Greenwiretotheparkingbrakewire(ifapplicable).
• ConnecttheBlue/Pinkwiretothespeedsensewire(ifapplicable).
• ConnecttheGreen/Purplewiretothereversewire(ifapplicable).
From the GMOS-MOST-01 harness to the aftermarket radio:
• ConnecttheBlackwiretothegroundwire.
• ConnecttheYellowwiretothebatterywire.
• ConnecttheRCA’stotheaudioAUX-INontheaftermarketradio(ifequipped).
Note: (a) This will allow you to retain the 3.5 AUX JACK in the console.
(b) The 3.5 jack can only be used if it is a single AUX jack.
(c) If the AUX jack has a USB port, neither can be used.
12-pin pre-wired ASWC-1 harness:
ThisharnessistobeusedinalongwiththeoptionalASWC-1(notincluded)to
retainsteeringwheelaudiocontrols.IftheASWC-1isnotbeingused,disregard
thisharness.Ifitwillbeused,pleaserefertotheASWC-1instructionsforradio
connectionsandprogramming.
Note: Disregard the harness that comes with the ASWC-1.
• ConnecttheRedwiretotheaccessorywire.
Connections to be made
GMOS-MOST-01
Connections to be made
• ConnecttheGreen/Black wiretotheGreen/Blackwireintheblack,8-pin
connectorbelowthesteeringcolumn,onthebottomside.(FigureA)
DIN jack:
TheDINjackistobeusedwiththeoptionalAX-LCD(soldseparately).
• ConnecttheRedwiretotheaccessorywire.
Note: The relay attached to the GMOS-MOST-01 harness is only for audible
turn signal clicks. No extra steps are required to retain this feature, so leave the
relay as-is.
With the key in the off position:
• Connectthe16-pin,8-pinand14-pinharnessintotheinterface.
• Withthekeyintheoffposition,connecttheGMOS-MOST-01harnessintothevehicle.
• Withallconnectionscompleted,reconnectthenegativebatteryterminal.
Note:If using the ASWC-1, connect it after you initialize and test the GMOS-
MOST-01, with the key in the off position.
Initializing the GMOS-MOST-01
Attention:If the GMOS-MOST-01 loses power for any reason, the following step
will need to be performed again.
• Initializetheinterfacebyturningtheignitiononfor30seconds,thenturnthe
ignitionbackoff,thenbackonagain.
Adjusting the GMOS-MOST-01
• Withthevehicleandradioturnedon,turnthevolumeup3/4oftheway.
• LocatetheendoftheGMOS-MOST-01withthe16-pinharnesswithstrippedleads.
• Withasmallscrewdriver,adjustthepotentiometerclockwisetoraisetheaudio
level;counterclockwisetolowertheaudiolevel.
• Onceatadesiredlevel,theaudioleveladjustmentiscomplete.
Installing the GMOS-MOST-01
(Figure A)
Green/Black wire
/