Owner's Manual
Pacific Accessory Corporation - Santa Ana, CA 92705
866-931-8021 • www.pac-audio.com
Page 1
8-6-10
The OS-2CTS is a plug and play interface that allow the installation of an aftermarket radio into Cadillac CTS and
SRX vehicles. It will maintain operation of the On Star® and factory amplified audio system. On Star® audio will play
through the front speakers when active. It also retains all warning chimes and Vehicle Rear Parking Assist chimes.
OS-2CTS/OS-2C-CTS
Cadillac CTS/SRX Radio Replacement
Installation Instructions
Pacific Accessory Corporation Pacific Accessory Corporation
2003 - 2007 CTS: All Models
2004 - 2006 SRX: Vehicles WITHOUT Factory Installed Navigation Radios
102.7 FM
Aftermarket stereo
30
85
86
87
87a
Redwiretoaccessory
input of radio
brown
loop wire
Cut brown wire at pin #16 and connect
it to mute input wire of radio
RAD - 18
20 pin
connector
(RED)
Red wire
16 pin
connector
(BLACK)
Optional: Connect Red (SWC) wire to the
Green wire of the SWI series interface.
Program version # 1
OS-CTS
Step 1. Pre wire the RAD-18 wire harness to the aftermarket stereo wire harness. If the aftermarket stereo has a mute wire, cut the brown wire as close as
possible to pin #16 of the RAD-18 harness and connect this mute output wire to the stereo’s mute wire. The amp remote wire (blue/white) must be
connected to the stereo’s remote wire.
Step 2. Connect the black 16 pin and the red 20 pin harness to the factory radio harnesses. Connect the OS-CTS wire harness into the OS-2CTS interface.
J1850
1850
Class
ass
ss
2
2
2
VPW
PW
Class
Class
2
2
J1850
50
J1850
1000
1000
1
11
10
10
111
111
10010
0010
1
0
0
1
1
10
0
1
1
1
10
10
0
0
11
11
10100
10100
00
00
1
10
10
1
1
10
10
11
1
1
1
100
00
1
1
1
10
10
0
0
Arbit
t
ratio
ratio
n
n
EO
EOD
CRC
CRC
1000
000
1
1
0
00
0
0
0
11
11
1
1
10
0
1
1
0
0
111
111
1
1
10010
10010
0
0
1
10
0
01
1
0
00
0
1
10
10
1
0
0
1
1
10
0
1
0
0
0
0
11
1
1
1
10100
0100
1
00
00
10
1
00
00
1
1
1
10
10
1
0
1
1
10
10
1
10
11
11
1
100
00
00
1
1
1
10
10
0
0
0
0
0
Class
Cla
ss
2
C
l
Clas
Class
s
2
C
a
J1850
1850
850
1
0
• Class II circuitry will not disable vehicle data bus even if interface loses power.
• On Star® active LED and Ignition on LED.
• Provides +12v switched accessory output. No more searching for switched +12v in fuse box or kick panel.
• Mute output to either mute the aftermarket radio or to turn if off when On Star® is active.
• On Star® Volume control via factory steering wheel audio controls or click wheel .
• New radio will operate with the vehicle RAP (Retained Accessory Power) system, which is 10 minutes or until a door is opened.
Note:
1. The OS-2CTS does not retain the factory XM receiver, you will lose this option when the factory radio is replaced with an aftermarket radio.
2. You may use this interface even if the vehicle does not have On Star® but need the interface with the factory amplifier.
3. On Star® must be enabled using the On Star® button on the rear view mirror, steering wheel On Star® button will not enable On Star®.
4. On Star® volume is not adjustable on CTS-V and SRX models, volume is preset at medium level.
5. The Cadillac SRX with Factory Navigation Radios do not use the same connectors as supplied.
Note: Due to the design of the factory amplified system, there is currently no way of fading from front to rear with an aftermarket radio. If using a SWI interface, con-
nect the green wire on the SWI interface to the red wire from the red 20 pin connector. The SWI interface must be programmed for Version #1.
Testing and Verifying Operation
1. Turn ignition on. The green ignition on LED inside of the interface will turn on and the +12v accessory wire will turn on.
2. Turn on the radio and check the balance. Note: Audio will not fade as the rear outputs of aftermarket radio can not be used.
3. Pressing the On Star® button on the mirror will mute or turn off the radio and allow the audio to be heard from the speakers. The On Star® active red
LED will also turn on. When On Star® disconnects, the radio will un-mute or turn back on and the On Star® LED will turn off. On Star® audio level can be
adjusted using the volume controls on the steering wheel (Volume level is preset for CTS-V and SRX vehicles).
4. Turn off vehicle and remove key. RAP will be active and keep the radio on for 10 minutes or until a door is opened.
5. The green ignition on LED and radio will turn off when RAP turns off or door is opened.
DISCLAIMER: Under no circumstances shall the manufacturer or the distributors of the OS-2CTS parts be held liable for consequential damages
sustained in connection with the OS-2CTS. 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-2CTS other than its replacement.
On Star® is a registered trademark of On Star® Corporation.
Bose® is a registered trademark of Bose® Corporation.
W I R E C O L O R C I R C U I T C I R C U I T W I R E C O L O R
9 1 8
8 1 7
7 1 6
6 1 5
5 1 4
4 1 3
3 1 2
2 1 1
1 1 0
P I N N U M B E R
Antenna
White/Black
Grey/Black
Green/Black
Purple/Black
Black
Blue
Orange
Blue/White
Red
Left Front(-)
Right Front (-)
Left Rear (-)
Right Rear(-)
Ground
Illumination
Amp Turn On
+12v Accessory Output
Left Front (+)
Right Front (+)
Left Rear (+)
Right Rear (+)
+12v Constant
White
Grey
Green
Purple
Yellow
N/A
N/A
Not Used
Not Used
N/A
To CM-1 (if used)
Orange
N/A
WIRE COLOR CIRCUIT CIRCUIT WIRE COLOR
816
PURPLE CLASS II DATA 715 12 CONSTANT YELLOW
BLACK GROUND
614
513
412
311
GRAY/BLK RIGHT FRONT (-) 210 RIGHT FRONT (+) GRAY
WHITE/BLACK LEFT FRONT (-)
19 LEFT FRONT (+) WHITE
PIN NUMBER
BLUE
ORANGE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
STEERING WHEEL CONTROL
N/A
N/A
N/A
STEERING WHEEL CONTROL
N/A
N/A
N/A
N/A
OS-CTS
OS2-RAD