PAC ROEM-GM21 Premium Sound System Interface Instruction Manual

PAC ROEM-GM21 Premium Sound System Interface

Installation instructions for cables on list “A,,

The “A” cable, is used when replacing a factory radio. (the appropriate cable from list “B” is also required). One end of cable plugs into or connects to your new aftermarket head unit and the other end plugs into the 18 pin connector of the OEM-1. When using the complete OEM-1 system the radio will be current protected by the vehicle fuse. The installer must decide to transfer any other fuses or noise filters from the harness provided with the head unit. Use the wire/ terminal identification chart below to locate the correct power wires. The low level inputs are for radios up to 25watts x 4. While every effort has been made to insure this cable was made to connect properly to your aftermarket head unit, changes in models and configurations do occur. To prevent potential damage consult your stereo’s owners manual and check wire function (as shown below) with that of the head unit you have. Move any wires that are not in the correct pin location for you head unit.

Installation instructions for cables on list “B”

The “B” cable, is used when replacing a factory radio. (the appropriate cable from list “A” is also required). One end of this cable plugs into the vehicle dash harness that was removed from the factory radio. (the AMP-UNV harness must be spliced into the vehicle harness, use the 16 pin chart below for wire identification) The other end plugs into the 16 pin connector of the OEM-1.

WIRE AND TERMINAL /DENT/FICAT/ON

Output of the OEM-1, 16 pin connector (cable “B” or AMP-RCA). Looking into connector I wire side of cable.

PURPLE/ BLK

GREEN/ BLACK

| RIGHT REAR(·)

LEFT REAR(·)

| 5 __

4

| 13

12

| RIGHT REAR(+)

LEFT REAR(+)

| PURPLE __

GREEN

 | N/C| 3| 11| N/C|
GRAY/ BLACK| RIGHT FRONT(·)| 2| 10| RIGHT FRONT(+)| GRAY
WHITE/ BLACK| LEFT FRONT f-l| 1| 9| LEFT FRONT (+l| WHITE

Input of the OEM-1, 18 pin connector ( cable “A” or “C”). Looking into connector I wire side of cable.

Installation instructions for cables on list “C”

The “C” cable, is used when replacing or adding aftermarket amplifiers to a factory amplified system. (the cable model# AMP-RCA is also required) This cable plugs in between the factory radio and the dash harness that was removed from the factory radio. The 18 pin connector then plugs into the OEM-1. The factory system remains unchanged using this cable. The ADD-UNV cable is used for universal connection to the vehicle harness for vehicles not listed. (splicing required) Audio should be at a low level when using this cable. Use the AMP-RCA cable connected to the 16 pin connector of the OEM-1 to connect your aftermarket amplifier. The AMP-RCA provides 2 pair of female RCA jacks and a remote turn on lead.

Installation instructions for the AMP-RCA cable

This cable is used when replacing or adding aftermarket amplifiers to a factory amplified system. (the appropriate cable from list “C” is also required) The AMP-RCA cable connects to the 16 pin connector of the OEM-1 and provides 2 pair of female RCA jacks and a remote turn on lead for connection to your aftermarket amplifier.

If the rear speakers do not work, ( usually this not the case), when replacing the head unit, or the rear channels do not work when adding an amplifier, your vehicle may have only one Bose amplifier and use one common audio return.

• To correct these problems: ( do this only if the rear speakers do not work)
• Cable AMP-GM21; connect the gray/black wire and green/black wires together.
• Cable ADD-GM21; connect the white/black wire and green/black wires together.
• 1990-1996 Corvette. Locate the 21 pin connector at the receiver box behind the right seat below the storage compartment.

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