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RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION Contents RPO options Circuit description Component description Theft deterrent feature Customer tips RPO Options The entertainment system on this vehicle is configured with either a base or uplevel audio system. (UM7) AM/FM Stereo (U1C) AM/FM Stereo CD (US8) AM/FM Stereo, CD, MP3, RDS, EQ (US9) AM/FM Stereo, 6-Disc CD, MP3, RDS, EQ (UVA) AM/FM Stereo, CD, DVD, MP3, RSE Video (UQ5) Base Four Speaker, No Amplifier (UQ3) Uplevel Six Speaker, No Amplifier (Y91) Premium (Luxury) GMC Denali (UQA w/o Y91) Non GMLAN Bose Amplifier (UQA w Y91) GMLAN Bose Amplifier (UQS) Cadillac Premium Amplifier (U2K) Digital Radio Circuit Operation at the start of the word. 'nine' Emphasize the 'n' sounds to distinguish from 'five'. 'star' Emphasize the 'r' at the end of the word. Emphasize the 'ah' sound 'pound' Emphasize the 'p' at the start of the word. Emphasize the 'd' at the
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Radio Power The main radio power is supplied by a 15A fuse located in the underhood fuse block. The radio The radio supports the following signals: System Power Mode Infotainment Operation Allowed The radio also supports the following GMLAN Vehicle Power Modes: OFF ACCESSORY RUN CRANK REQUEST Radio Ground A wire in the main radio connector that is connected to battery negative at all times provides the Radio Speaker Outputs At low volume, the plus (+) and minus (-) speaker outputs circuits measure approximately 7-8 Radio Head Unit Dimming GMLAN signal data received by the radio determines the radio dimming and backlighting levels.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
with the surrounding devices that use analog PWM dimming to backlight their control/graphics Amplifier Interface UQA without Y91(Non-GMLAN) The main amplifier power is provided by a 20A fuse located in the body control module (BCM). The radio provides a remote amp mute output circuit to control overall muting of remote non- The function table below shows the four possible amplifier mute functions. Amplifier Interface UQA (GMLAN) The main amplifier power is provided by a 30A fuse located in the underhood fuse block. For Volume Balance Fade Bass Midrange % Duty Cycle Out Function 0% (Vlow Vdc) FOUR_CHANNEL_UNMUTE 50% REAR_MUTE (input must be 2-channel) 75% SIX_CHANNEL_UNMUTE 100% (Vhigh Vdc) ALL_MUTE
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Treble DSP Modes Volume Compensation Chime Output Amplifier Radio Speaker Inputs The low-level audio signals (LF, RF, LR, and RR) from the radio are the inputs to the amplifier. The low level audio signals from the radio to the amplifier typically measure in the 4-5 volts Amplifier Speaker Outputs At a low volume, the plus (+) and minus (-) speaker outputs circuits measure approximately 2-7V Repeat speaker failure can be caused by a damaged amplifier. Test for a damaged quad bridge Remote Radio Audio Signal Inputs (UE1 only) Audio output from the OnStar® communications module connects to the remote audio signal Cellular Telephone Mute (UE1 only) The OnStar® communications module uses the cellular telephone mute signal circuit to over-ride
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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