Metra Electronics 99-3307G Installation Instructions Manual page 7

Final Assembly
5. Chime level adjustment:
a. With the vehicle on, turn it off and leave the keys in the ignition.
Open the driver's door; chimes will be heard.
b. Wait 10 seconds, and then with a small flat-blade screwdriver, turn the
potentiometer clockwise to raise the chime level; counterclockwise to
lower the chime level.
c. When the chime is at a desired level, remove the keys from the ignition.
This will lock the chime volume at its current level.
6. OnStar level adjustment:
a. Press the OnStar button to activate it.
b. While OnStar is speaking, press the VOLUME UP or VOLUME DOWN buttons
on the steering wheel to raise or lower the OnStar level.
c. If the vehicle does not come equipped with steering wheel controls, find the
Black/Yellow wire on the 3307 harness.
d. While OnStar is speaking, tap the Black/Yellow wire to ground. Once the
OnStar level is set, it will stay at that level until the Black/Yellow wire is
tapped to ground again.
7. Attach the radio trim panel over the completed assembly, and then reassemble
the dash in reverse order of disassembly.
99-3307G
(cont.)
7