Installation Guide

99-3018

Chime level adjustment

• With the vehicle on, turn it off and leave the keys in ignition.

Open the driver’s door; chimes will be heard.

• Wait 10 seconds, and then with a small screwdriver, turn the potentiometer

clockwise to raise the chime level; counterclockwise to lower the chime level.

• When the chime is at a desired level, remove the keys from the ignition.

This will lock the chime volume at its current level.

OnStar level adjustment

• Press the OnStar button to activate it.

• While OnStar is speaking, press the “Volume up” or “Volume down” buttons on

the steering wheel to raise or lower the OnStar level.

• If the vehicle does not come equipped with steering wheel controls, find the

Black/Yellow wire on the 22-pin harness.

• 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.

Adjusting the Interface Final Assembly

1. Secure the radio/bracket assembly into the dash using the factory hardware.

2. Snap the radio trim panel over the radio, and then reassemble the dash in

reverse order of disassembly.

3. The upper dash trim panel is intended for use in NAV equipped vehicles only.

A factory version of this panel is also available from the dealership.

Note: The metal clips for the upper dash trim panel must be oriented per

Figure A or they will not engage properly.

Note: If the vehicle did not have factory navigation, insert the (2) copper

threaded inserts into the empty upper radio mounting holes in the

dash cavity.

(Figure A)