PAC Speaker System OEM 2 User Manual

OEM – 2  
Universal sound system interface and controller  
The OEM-2 may be used in any one of four possible configurations and system types.  
1) Replacing a premium factory radio with an aftermarket stereo and use the factory amplifier and speakers.  
2) Four channel line out converter for adding amplifiers to a standard factory speaker system.  
3) Adding aftermarket amplifiers to a factory premium amplified system (Bose, JBL, etc.).  
4) Installing a radio with floating ground speaker outputs to a common grounded speaker system like the early Fords.  
The OEM-2 also includes a remote turn-on for amplifiers or a power antenna, providing 2 amps at 12 volts when 0.8 volts or greater is applied to the input side. This  
is useful for low voltage triggers like those used in Fords or for automatic triggering when audio is present. The output “turn on” is delayed 1 second to prevent turn  
on pops.  
Input wiring colors  
LF (+) speaker (high power)  
LF (+) speaker (low power)  
LF (–) common  
Output wiring colors  
LF (+) low level output  
LF (+) common gnd. speaker output  
LF (–) common  
RF (+) low level output  
RF (+) common gnd. speaker output  
RF (–) common  
LR (+) low level output  
LR (+) common gnd. speaker output  
LR (–) common  
RR (+) low level output  
RR (+) common gnd. speaker output  
RR (–) common  
Constant battery  
Switched power  
Gnd. neg. power  
Power antenna turn on  
Amplifier remote turn on 2 amps max.  
Illumination dimming  
White 1  
White  
White/red 2  
White/black 3  
Gray 1  
White/red  
White/black 7  
Gray  
RF (+) speaker (high power)  
RF (+) speaker (low power)  
RF (–) common  
Gray/red 2  
Gray/black 3  
Green 1  
Gray/red  
Gray/black 7  
Green  
LR (+) speaker (high power)  
LR (+) speaker (low power)  
LR (–) common  
RR (+) speaker (high power)  
RR (+) speaker (low power)  
RR (–) common  
Green/red 2  
Green/black 3  
Violet 1  
Green/red  
Green/black 7  
Violet  
Violet/red 2  
Violet/black 3  
Yellow 4  
Violet/red  
Violet/black 7  
Yellow  
Red  
Black  
Blue  
Blue/white  
Orange  
Constant battery  
Switched power  
Gnd. neg. power  
Power antenna turn on  
Amplifier remote turn on 0.8 v min.  
Illumination dimming  
Red 4  
Black 4  
Blue 4  
Blue/white 5  
Orange 4  
1 Connect these wires to an aftermarket radio (+) high power speaker output (typically 20 watts x 4 and higher).  
2 Connect these wires to an aftermarket radio (+) low power speaker output. (All stereos up to 20 watts x 4 or when wiring for #4)  
3 If the radio is high power (floating ground), connect these wires separately to each of the radio’s speaker (-) wire (do not connect (-) speaker wires together). If the  
radio has a common ground speaker outputs, connect these wires together along with the radio’s speaker ground.  
4 These wires go directly through to the outputs for convenience of wiring. The red and black wires supply power to the internal low voltage trigger.  
5 This wire needs only a minimum of 0.8 volts to supply 12 volts on the blue/white wire on the output side of the OEM-2.  
6 For convenience, the positive leads of the RCA are connected internally to these wires.  
7 For convenience, the grounds of the RCA are connected internally to these wires. Not used with common grounded speakers.  
Note: Some Chrysler/Dodge vehicles with a Infinity premium sound system do not need any interface. If the speakers fade and balance correctly with this interface  
installed, but you have very little volume, then you do not need this interface.  
1) Replace the factory premium radio with an after market radio/deck and retain the use of the factory amplifiers and speakers  
Referring to the wire color chart above, connect the speaker outputs of the new radio to the OEM-2, using the positive, solid color, and the negative black-striped  
wires for all four channels. On the output side of the OEM-2 connect the solid color wires (+) and the black-striped wires (-) to the factory harness leading to  
the factory amplifiers. If there are common audio return wires (-) used in the vehicle for either the front and rear channels then connect the negative outputs of  
the OEM-2 to them. If there is only one audio return wire for all four channels connect all the black-striped wires to it. Connecting the constant power (yellow),  
switched power (red), ground (black), antenna trigger (blue), illumination (orange), and amplifier turn on (blue/white) through the OEM-2 simplifies wiring to the  
vehicle. The output level controls can be adjusted with a small screwdriver.  
LF  
Aftermarket stereo  
plug removed from factory stereo  
LR  
(+)  
(-)  
102.7 FM  
(+)  
(-)  
wht & wht/blk  
wht & wht/blk  
gray & gray/blk  
grn & grn/blk  
gray & gray/blk  
grn & grn/blk  
OEM-2  
Factory Amplifier  
RR  
vio & vio/blk  
vio & vio/blk  
Pacific Accessory Corporation Santa Ana, CA 92705  
-
RF  
(+)  
(-)  
blu/wht amplifier remote turn on  
connect blu/wht to new stereo's remote wire  
(+)  
(-)  
rev. 10-7-02  
Pacific Accessory Corporation - 1502 S. Santa Fe Street, Santa Ana, CA 92705  
Page 1  
 
Wiring the OEM-2 and aftermarket stereo to a GM  
factory Bose Premium Sound System  
Mobile Audio Interfacing Equipment  
Important!  
If you are using the supplied wire harness from Crutchfield, or other aftermarket wire harness either from Metra, Scosche or  
American International, you can not connect the audio signal wires of the supplied wire harness to the OEM-2 color for color (you  
may however, connect the red, black, blue, orange, and yellow wire color for color). The wire harness supplied by Crutchfield or other  
above mentioned wire harnesses are not designed for Bose Premium Sound Systems. You will need to trace the factory wire colors  
and match them over to the aftermarket harness. Connect the OEM-2 outputs according to the chart.  
The factory wire colors given are typical of most GM vehicles with a Bose Premium Sound System. If the colors do not match up,  
you will need to obtain a wiring diagram of your vehicle from a dealer. In some vehicles the audio common wires could have a striped  
wire.  
NOTES: 4 possible GM plug configurations.  
GM21 and GM21A: has a bare shield wire for both front  
a rear speakers.  
GM21B: has no bare shield wire and has common wires  
for front and rear.  
12 13  
16  
11  
1
14 15  
17 18 19  
20  
10  
8
9
2
3
4
5
6
7
GM21C: has a positive and negative wire for each  
speaker.  
Use the shield wire(s) as a guide to determine which  
chart to use.  
Factory GM 21 pin plug  
Viewed from pin side not wire side  
GM21B  
GM21  
Factory plug.  
Connect these wires to  
Factory plug.  
Connect these wires to  
OEM-2  
n/a  
wht wire  
n/a  
gry wire  
black wire  
orange wire  
n/a  
OEM-2  
1 = n/a  
1 = front audio shield, bare wire  
2 = left front positive (LF+), tan  
3 = right and left front common (-), lt. grn  
4 = right front positive (RF+), dark green  
5 = chassis ground, black  
6 = illumination/dimmer, gray  
7 = n/a  
black wire  
wht wire  
wht/blk and gry/blk wires  
gry wire  
black wire  
orange wire  
n/a  
blue/wht  
red wire  
yellow wire  
black wire  
2 = left front positive (LF+), tan  
3 = n/a  
4 = right front positive (RF+), dark green  
5 = chassis ground, black  
6 = illumination/dimmer, gray  
7 = n/a  
8 = remote turn on, pink  
blue/wht  
red wire  
8 = remote turn on, pink  
9 = 12 volt ignition/switched (+12), yellow  
10 = 12 volt battery/constant (+12), orange  
17 = audio common  
18 = right rear positive (RR+), dark blue  
19 = n/a  
9 = 12 volt ignition/switched (+12), yellow  
10 = 12 volt battery/constant (+12), orange  
17 = rear audio shield, bare wire  
18 = right rear positive (RR+), dark blue  
19 = right and left rear common (-), yellow  
20 = left rear positive (LR+), dark brown  
yellow wire  
prp/blk, wht/blk, gry/blk and grn/blk wires  
purple wire  
n/a  
grn wire  
purple wire  
prp/blk and grn/blk wires  
grn wire  
20 = left rear positive (LR+), dark brown  
GM21C  
GM21A  
Factory plug.  
Factory plug.  
Connect these wires to  
Connect these wires to  
OEM-2  
OEM-2  
1 = left front negative (LF-), gray  
2 = left front positive (LF+), tan  
3 = right front negative (RF-), dark green  
4 = right front positive (RF+), lt. green  
5 = chassis ground, black  
6 = illumination/dimmer, gray  
7 = n/a  
wht/blk wire  
wht wire  
gry/blk wire  
gry wire  
black wire  
orange wire  
n/a  
1 = left front positive (LF+), tan  
2 = right and left front common (-), lt. grn  
3 = right front positive (RF+), dark green  
4 = front audio shield, bare wire  
5 = chassis ground, black  
6 = illumination/dimmer, gray  
7 = n/a  
wht wire  
wht/blk and gry/blk wires  
gry wire  
black wire  
black wire  
orange wire  
n/a  
8 = remote turn on, pink  
blue/wht  
red wire  
yellow wire  
prp/blk wire  
purple wire  
grn/blk wire  
grn wire  
8 = remote turn on, pink  
blue/wht  
red wire  
yellow wire  
purple wire  
prp/blk and grn/blk wires  
grn wire  
9 = 12 volt ignition/switched (+12), yellow  
10 = 12 volt battery/constant (+12), orange  
17 = right rear negative (RR-), lt. blue  
18 = right rear positive (RR+), dark blue  
19 = left rear negative (LR-), yellow  
20 = left rear positive (LR+), brown  
9 = 12 volt ignition/switched (+12), yellow  
10 = 12 volt battery/constant (+12), orange  
17 = right rear positive (RR+), dark blue  
18 = right and left rear common (-), yellow  
19 = left rear positive (LR+), dark brown  
20 = rear audio shield, bare wire  
black wire  
Document and Material Disclaimer: All information, including photos and illustrations, in these pages is believed to be correct and reliable. The information  
contained in these pages is given as general information for the installation of audio accessories into mobile and/or vehicle applications. PACIFIC ACCESSORY  
CORPORATION shall not be held liable for any damages and/or injuries resulting from the use of information contained in these pages. All information contained in  
these pages should be checked and verified with appropriate test equipment to assure the safety and proper operation of equipment installed and the vehicle itself.  
Copyright © 2002 Pacific Accessory Corporation.  
Pacific Accessory Corporation - 1502 S. Santa Fe Street, Santa Ana, CA 92705  
11-08-02  
Page 1  
 
NOTES: 2 possible plug configurations.  
GM32: has one audio shield wire.  
GM32A: has two audio shield wires.  
Use the shield wire(s) as a reference to  
select which chart to use.  
E1  
F1  
2
2
5
5
7
7
8
8
9
9
11  
11  
13  
13  
15 16  
15 16  
3
3
4
4
6
6
10  
10  
12  
12  
14  
14  
Factory GM 32 pin plug  
Viewed frompin side not wire side  
GM32A  
GM32  
Factory plug.  
Connect these wires to  
Factory plug.  
Connect these wires to  
OEM-2  
OEM-2  
Row E  
Row E  
1 = n/a  
2 = n/a  
n/a  
n/a  
1 = n/a  
2 = n/a  
n/a  
n/a  
3 = remote turn on  
4 = n/a  
5 = n/a  
6 = n/a  
7 = n/a  
8 = n/a  
9 = n/a  
10 = n/a  
12 = left rear positive (LR+)  
13 = rear audio shield, bare wire  
14 = rear audio common return (-)  
15 = right rear positive (RR+)  
16 = chassis ground  
blue/wht wire  
n/a  
n/a  
n/a  
n/a  
n/a  
n/a  
n/a  
3 = remote turn on  
4 = n/a  
5 = n/a  
6 = n/a  
7 = n/a  
8 = n/a  
9 = n/a  
10 = n/a  
12 = left rear positive (LR+)  
13 = n/a  
14 = n/a  
blue/wht wire  
n/a  
n/a  
n/a  
n/a  
n/a  
n/a  
n/a  
grn wire  
n/a  
n/a  
prp wire  
black wire  
grn wire  
black wire  
prp/blk and grn/blk wire  
prp wire  
15 = right rear positive (RR+)  
16 = chassis ground  
black wire  
Row F  
1 = constant 12 volts  
2 = accessory 12 volts  
3 = antenna remote turn on  
4 = illumination/dimmer  
5 = n/a  
6 = n/a  
7 = n/a  
8 = n/a  
9 = n/a  
10 = n/a  
Row F  
1 = constant 12 volts  
2 = accessory 12 volts  
3 = antenna rem ote turn on  
4 = illumination/dimmer  
5 = n/a  
6 = n/a  
7 = n/a  
8 = n/a  
9 = n/a  
10 = n/a  
yellow wire  
red wire  
blue wire  
orange  
n/a  
n/a  
n/a  
n/a  
yellow wire  
red wire  
blue wire  
orange  
n/a  
n/a  
n/a  
n/a  
n/a  
n/a  
n/a  
n/a  
12 = left front positive (LF+)  
13 = front audio shield, bare wire  
14 = front audio common return (-)  
15 = right front positive (RF+)  
16 = n/a  
wht wire  
black wire  
gry/blk and wht/blk wires  
gry wire  
n/a  
12 = left front positive (LF+)  
13 = audio shield, bare wire  
14 = audio common return (-)  
15 = right front positive (RF+)  
16 = n/a  
wht wire  
black wire  
prp/blk,grn/blk,gry/blk and wht/blk wires  
gry wire  
n/a  
GM12  
G
F
E
Factory plug.  
Connect these wires to  
OEM-2  
M
A = right front positive (RF+), lt. grn  
B = left front positive (LF+), tan  
C = front shield, bare wire  
gry wire  
wht wire  
black wire  
BLACK  
D= right front negative, left front negative  
E = remote turn on, pink  
F = 12 volt ignition/switched (+12), yellow  
G = ground, black  
H = left rear positive (LR+), brown  
J = right rear positive (RR+), dark blue  
K = left rear negative, right rear negative  
L = rear shield, bare wire  
gry/blk and wht/blk wire  
blue/wht wire  
red wire  
black wire  
green wire  
prp wire  
prp/blk and grn/blk wire  
black wire  
orange wire  
A
B
C
D
WHITE  
M = illumination/dimmer, gray  
H
J
K
L
on separate two pin, white plug, orange  
wire is constant 12 volts.  
yellow wire  
Late 1984 and later models only  
BLUE  
Viewed from pin side not wire side  
Pacific Accessory Corporation - 1502 S. Santa Fe Street, Santa Ana, CA 92705  
 
Page 2  

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