PAC OS-4 User Manual

J1850

Class 2

VPW

Class 2

J1850

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J1850

OS-4

OS-GMLAN29

OS-NAV

XM R

XM L

Connect to SWC

Interface. Program

for Version 2.

OS-RADPWRAUDIO

General Motors OnStar®

Interface for GMLAN Vehicles With or

Without Factory Amplifi ed Audio Systems

The OS-4 is a plug and play interface that allows the replacement of a General Motors GMLAN factory radio. The OS-4 will

maintain operation of the OnStar® system in vehicles with Bose® audio systems, amplifi ed audio systems and also audio
systems without external amplifi ers . The OS-4 has on board switching that allow audio from the OnStar® system to play
through the two front factory speakers. This interface retains all warning chimes, audible turn signal indicators, Bluetooth
and the Vehicle Rear Parking Assist System (if equipped). The factory XM radio tuner can be controlled from the Rear Seat

Entertainment (RSE) Controls. RSE headphone jacks will also remain active and are designed for use with dual zone radios

and the factory installed XM tuner. If the overhead LCD is present the IR headphone system will also be active.

• OnStar® active LED and Ignition on LED.

• New radio will operate with the vehicle RAP (Retained Accessory Power) system.

• Provides +12v RAP circuit, Illumination, Vehicle Speed Sensor (VSS) Output, Parking brake, and Reverse trigger outputs.

• OnStar® Volume control via factory steering wheel audio controls or a push-button switch.

• Safety chime audio level is controlled through the Driver Information Center (DIC).

• RSE Controls will play the aftermarket radios dual zone source or the factory XM tuner if serviced.

• Overhead RSE LCD is usable as well as factory IR headphone system and Rear Auxiliary Input Jacks (use PAC Part # GMRVD).

• Steering wheel radio controls can be retained to control new radio by using the SWI-X, ECL2, JACK or PS.

Notes

1. The OS-4 will retain the use of the factory installed XM receiver. Factory RSE Controls must be present for use of this feature.

2. You may use this interface if the vehicle does not have OnStar® but you need to interface with the Bose® amplifi er

3. This interface will work in amplifi ed or non-amplifi ed audio systems.

4. This interface retains the 5.1 audio system in equipped Cadillac vehicles.

5. Built in Smart Mute Circuitry will play OnStar® through the front speakers and allow the RSE audio jacks to continue playing the audio
source selected by the RSE Controls.

Supported Vehicles

The Following General Motors Vehicles using the GMLAN Data Bus

Chevy: Express (08) Equinox (07-08) Suburban (07-09) Tahoe (07-09) Avalanche (07-09) Monte Carlo (06-07) Silverado - not classic (07-09) Impala (06-09)

Transverse (09)

GMC: Acadia (07-09) Yukon Denali (07-09) Yukon (07-09) Sierra - not classic (07-09)
Cadillac: DTS (06-09) Escalade - including ESV and EXT (07-09) SRX (07-09)
Buick: Enclave (08-09) Lucerne (06-09)
Hummer: H2 (08-09)
Pontiac: Torrent (07-09)
Saturn: Outlook (07-09) Vue (08-09)
Suzuki: XL-7 (07-08)

• Aftermarket radio connections are made at the 20-pin OS-RADPWRAUDIO connector.

A detailed description of these wires is on the next page.

• If the vehicle has Rear Seat Audio Controls and the XM tuner is serviced plug the 8 pin

XM Audio output cable into the OS-4. The RCA cables will feed the XM audio into the
aftermarket radios AUX input (if available). The XM RCA cables are not necessary for
Rear Seat Audio but will allow the headunit to play the XM audio through the cabin.

• Factory installed audio options such as Bose, Harman Kardon or Pioneer amplifi ers

will determine the 16-pin OS-GMLAN29 connection. If the vehicle has a factory installed
amplifi er use the Factory Amplifi er Audio location. If a factory installed amplifi er is not
present use the Non-Amplifi ed Factory Audio location.

• The OS-NAV connector has VSS, Reverse and Parking Brake outputs as well as the

OnStar push button volume adjustment input.

Installation

Upgraded Radio Connections

SWC Interface
Connections

Navigation Connections

• If SWC buttons are present and retained using a radio specifi c SWC interface use the

provided plug. No other connections or splices are necessary.

• The CMX retains all factory warning and safety chimes. If the vehicle chimes when the

radio is removed the CMX is not needed.

• The Mute loop (if not cut) will turn the ACC. output off when an OnStar or Bluetooth call

is made or received. If the aftermarket radio has a mute input cut this loop and connect
the outer brown wire to the mute input.

Pacifi c Accessory Corporation - 1502 S. Santa Fe Street, Santa Ana, CA 92705

[e-mail] • Voice: 866-931-8021 • Fax: [phone] • www.pac-audio.com

10-06-08

Vehicle Connections

Page 1

Press and

Hold for

1.5 seconds
to Activate

Onstar Voice
Recognizition or
Bluetooth Phone

Services

Raises and

Lowers Onstar

the Audio

Level While

Onstar is

Active

(7 positions)

Activate

Onstar Voice

Recognizition

Services

Connect to

Onstar

Personal

Calling

Setvices

Onstar

Emergency

Services

Ends Current

Onstar Call

or Rejects

Incoming
Bluetooth or
OnStar Call

12

13

24

Green/White wire

SPST N.O. switch (not included)

Wire insertion side view

(OS-NAV 24-pin connector)

VSS

(purple/white)

Parking

Brake

(red/white)

Reverse
(green)

O.S.
Level Switch
(green/white)

2

3

4

5

6

7

8

9

10

11

14

15

16

17

18

19

20

21

22

23

1

12

13

24

OS-NAV

2

3

4

5

6

7

8

9

10

12

13

14

15

16

17

18

19

20

1

11

Connect to SWC

Interface. Program

for Version 2.

Connect to Radio

Specific SWC

Interface

Center

SUB

(Wire side view)

Connecting the OS-4 to an aftermarket radio

1 Green/White OnStar Level Control

2 N.C.

3 N.C.

4 N.C.

5 N.C.

6 N.C.

7 N.C.

8 Purple/White Vehicle Speed Sensor Output

9 N.C.

10 N.C.

11 N.C.

12 N.C.

13 N.C.

14 N.C.

15 N.C.

16 N.C.

17 Green Reverse Light Output

18 Red/White Parking Brake Output

19 N.C.

20-24 N.C.

(Wire side view)

OS-RADPWRAUDIO

1 White FL+ Speaker Input

2 Grey FR+ Speaker Input

3 N.C.

4 N.C.

5 Black Ground

6 Yellow Battery

7 Brown Mute Sense Input

8 Purple RR+ Speaker Input

9 Green RL+ Speaker Input

10 Brown Mute Output (-)

11 White/Black FL- Speaker Input

12 Grey/Black FR- Speaker Input

13 Red RAP Output

14 Burgundy Chime+

15 Orange Illumination Output (+)

16 Blue/White Amp On Input

17 White/Green SWC Output

18 Purple/Black RR- Speaker Input

19 Green/Black RL- Speaker Input

20 Black Chime -

SWC Output Connector

• The OS-4 provides a SWC output connector attached to the OS­RADPWRAUDIO harness. For ease of installation, all necessary
connections for a SWI-X, ECL2, JACK, or PS have made for you.

• When using this SWC output connector the radio specifi c SWC interface
must be programmed for version 2 (refer to SWC interface programming
instructions for exact programming sequence).

• Both loops should also remain in tact.

• During steering wheel button assignment programming each button
should be pressed and held for 1 second after the SWC interface LED
goes out with the exception of the Speak button.

• The speak button should be pressed for less than 1 second and
released.

• Pressing the Speak button for longer than 1.5 SEC will activate OnStar.

Connecting to and Using OnStar

From SWC

Buttons

From OnStar Touch Pad

Using the CMX

• The provided CMX will play all safety/warning
chimes and turn signal/hazard light tones in
vehicles that do not play these chimes/tones when
the factory installed radio is removed.

• When the radio is removed - if factory chimes still
play the CMX is not needed. The CMX cable (2­pin connector attached to the OS-RADPWRAUDIO
interface harness) should be tied up as it is not
used for any other connections.

• To adjust the level of the warning and safety
chimes refer to the vehicles owner manual for
Driver Information Center (DIC) settings. Not all
vehicles have a DIC. If the DIC is not available the
chime level is not adjustable.

OnStar Level Control for Vehicles without SWC Buttons

Center and Sub Connections

• Some Cadillac vehicles are
equipped with a Dolby Surround
Sound Amplifi ed Audio System. The
amplifi ers 5.1 mode is enabled when
the RSE system is off and OnStar is
not active. If the aftermarket radio
has a dedicated center channel
and or sub output connect it to the
provided cable as labeled. Refer to
the aftermarket radios owner manual
for surround sound settings and
adjustments.

• If the aftermarket radio to be
installed does not have a dedicated
center channel or sub output do not
use this cable. To ensure best sound
performance channel summing is
not recommended. Use this cable
according to the outputs that are
available.

• This cable can also be used for
factory reverse camera retention if
available and if center channel and
or sub connections are not needed
(see Notes section of this manual).

• To activate Bluetooth Services (if present) and OnStar Services if Bluetooth is not present press and
hold the Speak SWC button for 1.5 seconds. Pressing the circled phone button on the OnStar touch
pad will only activate OnStar Services.

• Pressing the SWC Vol+ or Vol- during an OnStar/Bluetooth connection will raise and lower the
OnStar or Bluetooth audio level.

• Pressing the down arrow SWC button or circled phone button on the OnStar touch pad during an
OnStar or Bluetooth call will end the current OnStar connection. The down arrow will also reject
incoming OnStar or Bluetooth calls.

• OnStar Personal calling and Emergency services can be activated by the buttons on the mirror.

10-06-08

Pacifi c Accessory Corporation - 1502 S. Santa Fe Street, Santa Ana, CA 92705

[e-mail] • Voice: 866-931-8021 • Fax: [phone] • www.pac-audio.com

• If SWC buttons are not present a SPST switch can be used to control the
OnStar audio level during an OnStar connection.

• Using the provided Green/White wire, connect the non-terminated end to one
side of a SPST normally open momentary switch (not included).

• The terminated end will go into the OS-NAV connector position X (see picture
above).

• The other side of the SPST switch will be connected ground.

• When OnStar is active pressing the switch will raise the audio level 7 times
before returning to the original level.

Page 2

Using the Rear Seat Audio Controls

Radio

Turns the

Rear Seat

Controls On

or Off

Change between

Factory XM tuner

and Dual Zone

Radio Source

Controls the

Radio as

Programmed

by the SWC

interface (Mapped

to the Arrow

and Bar Button)

Controls the

Radio as

Programmed

by the SWC

interface (Mapped

to the Arrow

Down Button)

Controls the

Radio as

Programmed

by the SWC

interface (Mapped

to the Arrow

Up Button)

XM 16

Turns the

Rear Seat

Controls On

or Off

Change between

Factory XM tuner

and Dual Zone

Radio Source

Has No

Function

Seek to the

Next

Factory XM

Tuner Station

Seek to the

Previous

Factory XM

Tuner Station

12

3

45

6

7

8

9

16

Center and Sub

Brown Connector (supplied

with interface)

3: Center +
4: Sub +
6: Camera +
7: Camera ­11: Center ­12: Sub -

10

11

1213

14

15

Wire side view

X

X

X

X

X

X

Using the Radios Dual Zone Source Using the Factory XM Radio Tuner

• Press the power button to turn the RSE Controls on. When Radio is displayed on the RSE
Controls, the aftermarket radios rear speaker output will be heard through the headphone
jacks. Putting the aftermarket radio into dual zone mode should change the output level
of the rear speakers to a fi xed level. This allows precise user adjustment from the level
knobs on the RSE Controls (refer to aftermarket radio owners manual for model specifi c
dual zone operation).

• The seek arrows and PROG button will control the radio as programmed by the SWC
interface. These buttons are mapped to the SWC buttons as stated above.

• Pressing the SRCE button will toggle between the Factory XM tuner and the Radio as the
RSE source. Pressing the power button will turn the RSE Controls off as well as turning

• Press the power button to turn the RSE Controls on. If Radio is displayed press the
SRCE button to select factory XM tuner mode. When XM followed by the channel number
is displayed factory XM tuner audio will be heard through the headphone jacks.

• The Seek arrows will control the factory XM radio tuner and select the desired station.

• The PROG button has no function.

• Pressing the SRCE button will toggle between the Factory XM tuner and Radio as
the RSE source. Pressing the power button or turning the key off will turn off the RSE
Controls.

• The factory XM tuner must remain serviced to take advantage of this feature. Visit www.

xmradio.com for a complete up-to-date channel listing and service options.
the key off. The seek arrows and PROG button will continue to operate as stated (with the
exception of SRCE which has no function) when the Rear Seat Controls are turned off.

Installation Notes

1. When the interface is connected to the vehicle for the fi rst time the car must be started so all vehicle features are recognized by the interface.

2. DO NOT cut the Brown loop on the SWC interface connector. Program the radio specifi c SWC Interface for version #2.

3. When the Rear Seat Audio jacks are activated in any vehicle OTHER than the Cadillac Escalade or a UQA amplifi ed vehicle the rear speakers will mute.

4. The headphone jacks will play the rear zone source selected by the head unit (refer to the new radios instruction manual for details on this feature if
equipped). Maximize the rear zone volume level (this will reduce unwanted noise). During an OnStar call the front speakers play OnStar, the rear speakers are
muted and the headphones will continue to play the rear zone audio source.

5. Using the Center and Sub cable for factory reverse camera retention.

• With the supplied brown connector NOT attached to the vehicles brown radio connector: lift the upper and
lower locking tabs near the wire insertion part of the supplied brown connector which houses the center and
sub RCA cables.

• Depress the silver exposed locking tabs on which ever RCA connector (center or sub) is not being used during
this installation.

• After removing both shield (black) and center conductor (red or white) pins - re-insert as follows (see image
aside).

• Pin 6 is the camera+ signal and Pin 7 is the camera- signal. After inserting the pins clasp the locking tab back
down to lock the moved pins into place.

• Fit the modifi ed brown connector into the vehicles brown connector and plug the moved RCA cable into the
aftermarket radios camera input (mark this RCA cable for future reference).

• Use the supplied reverse output wire (green wire in OS-NAV connector) for automatic switching when the
vehicle is put into reverse.

6. DTS, Equinox, Torrent and Vue Installation Notes:
If the vehicle is equipped with a factory amplifi er other than a Bose amplifi er and OnStar audio is not heard

during operation the Black/White wire located in the OS-GMLAN29 harness needs to be cut in half and insolated
at both ends (c2 vehicle (16pin) connector pin 8) .

Testing and Verifying Operation

1. Turn ignition on. The red ignition LED inside the interface will turn on and the +12v accessory wire will turn on.

2. Turn on the radio and check balancing and fading. Note: The RPO code UQA (standard digital Bose® amplifi er) will not fade as the

rear outputs of aftermarket radio do not adjust the amplifi er.

3. Pressing the OnStar® button will turn off the rear speakers and allow the OnStar® audio to be heard in the two front speakers. The
OnStar® active red LED will also turn on. When OnStar® disconnects, the radio will un-mute or turn back on and the OnStar® LED will
turn off.

4. Turn off vehicle and remove key. RAP will be active and keep the radio on for 10 minutes or until the drivers door is opened.

5. The red ignition On LED and radio will turn off when RAP turns off or the drivers door is opened.

6. Pressing the Mute/OnStar® button on the steering wheel for 1.5 seconds will also activate Onstar®.

DISCLAIMER: Under no circumstances shall the manufacturer or the distributors of the OS-4 parts be held liable for consequential damages sustained
in connection with the OS-4. The manufacture and it’s distributors will not, nor will they authorize any representative or any other individual to
assume obligation or liability in relation to the OS-4 other than its replacement.

OnStar® is a registered trademark of OnStar® Corporation.

Bose® is a registered trademark of Bose®

10-06-08

[e-mail] • Voice: 866-931-8021 • Fax: [phone] • www.pac-audio.com

Pacifi c Accessory Corporation - 1502 S. Santa Fe Street, Santa Ana, CA 92705

Page 3