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
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