Quick Start Guide

REV. 4/1/2019 INST99-3028S

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CONNECTIONS

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• The Black/Yellow wire is used for OnStar level adjustment for models that do not come

equipped with steering wheel controls. Refer to the OnStar level Adjustment section for

further instructions.

• If retaining the factory AUX-IN jack is desired, connect the Red and White RCA jacks to the

audio AUX-IN jacks from the aftermarket radio.

Note:

a) The jack can only be used if it is a single jack.

b) If the jack has a USB port as well, neither can be retained.

Note: The relay attached to the 3028 harness is only for audible turn signal clicks. No extra steps

are required to retain this feature, so leave the relay as-is.

DIN jack:

The DIN jack is to be used with the optional AX-LCD (sold separately) to retain the

personalization menu.

Continue to Installation

For models

with

an ampliﬁer:

From the 16-pin harness with stripped leads to the aftermarket radio:

• Connect the Red wire to the accessory wire.

Note: If installing either an ASWC-1 or AX-LCD (both sold separately), connect the (2)

Red wires from the 3028 harness as well.

• Connect the Blue/White wire to the amp turn on wire. This wire must be connected to hear

sound from the factory ampliﬁer.

• If the aftermarket radio has an illumination wire, connect the Orange/White wire to it.

• If the aftermarket radio has a mute wire, connect the Brown wire to it. If the mute wire is

not connected, the radio will turn off when OnStar is activated.

• 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 White wire to the left front positive speaker output.

• Connect the White/Black wire to the left front negative speaker output.

The following (3) wires are only for multimedia/navigation radios that require these wires.

• Connect the Blue/Pink wire to the VSS/speed sense wire.

• Connect the Green/Purple wire to the reverse wire.

• Connect the Light Green wire to the parking brake wire

• Tape off and disregard the following (4) wires, they will not be used in this application:

Green, Green/Black, Purple, Purple/Black