Metra Electronics 99-3012G Installation Instructions Manual page 5

Amplified vehicles:
• Connect the Violet wire to the right rear positive
wire of the aftermarket radio
• Connect the Violet/Black wire to the right rear
negative wire of the aftermarket radio
• Connect the Green wire to the left rear positive wire
of the aftermarket radio
• Connect the Green/Black wire to the left rear
negative wire of the aftermarket radio
Non-amplified vehicles:
• Cut the resistors from the Green, Green/black,
Purple, Purple/Black right below the heat shrink
• Connect the Violet wire to the right rear positive
wire of the aftermarket radio
• Connect the Violet/Black wire to the right rear
negative wire of the aftermarket radio
• Connect the Green wire to the left rear positive wire
of the aftermarket radio
• Connect the Green/Black wire to the left rear
negative wire of the aftermarket radio
The Pink wire is not used in this application.
99-3012G
Installing the Interface
Installing the Interface:
1. With all the connections completed, plug the 16 and
22 pin harnesses into the interface.
2. Plug the 44 pin GM harness into the vehicle side
harness, and plug the aftermarket radio harness into
the aftermarket radio.
3. Reconnect the negative battery terminal.
Programming:
• You must cycle the A/C fan speed all the way to high
and back to low when you first install the kit.
Note: Continue to the "Testing the Interface" section
if you do not have factory audio controls on the
steering wheel.
Chime Volume Adjustment
1) With car on, shut off car and leave keys in
i gnition. Open the car door and leave it open.
Chimes will be heard.
2) Wait 10 seconds, then with a small screwdriver
adjust the potentiometer fully counterclockwise (all
the way left), then clockwise to raise chime level
and counterclockwise to lower the chime level.
3) When the volume is at the desired level, remove
the keys from the ignition. This will lock the chime
volume at its current level.
5
Audio Level Adjustment
1) Start your vehicle and turn on the radio having
audio playing.
2) Turn your aftermarket radio's volume up ¾ of the way.
3) With a small screwdriver adjust the potentiometer
clockwise to raise the audio level and
counterclockwise to lower the audio level.
4) Once at desired level your audio adjustment
is complete.
OnStar Level Adjustment
To adjust the OnStar volume level find the
Black/Yellow wire on the 16-pin harness. Push the
blue OnStar button, while the voice is speaking tap
the Black/Yellow wire to ground. Once the volume is
set it will stay at that volume until the Black/Yellow
wire is tapped to ground again. This can be set during
installation and then left alone. If user adjustment is
desired, the customer may also tap "Volume Up" or
down on the steering wheel (if equipped) to adjust the
OnStar level.
Additional 12-pin harness (ASWC-1)
• This 12-pin harness is to be used in conjunction
with the ASWC-1 (not included). Please refer to the
ASWC-1 instructions for programming.