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Without Amplifier (UQ3) 1. Ignition OFF, disconnect the harness connector at the appropriate speaker. 2. Radio ON, test for 5.0-7.5 volts between the speaker circuit terminal A and ground. If greater than the specified range, test the speaker circuit for a short to voltage. If the If less than the specified range, test the signal circuit for a short to ground or an 3. Test for 5.0-7.5 volts between the speaker circuit terminal B and ground. If greater than the specified range, test the speaker circuit for a short to voltage. If the If less than the specified range, test the speaker circuit for a short to ground or an 4. If the vehicle is equipped with UK6 Rear Seat Audio and the concern is with a rear speaker, Test the speaker circuits between the radio and the RSA control. 5. If all circuits test normal, test or replace the speaker. With Amplifier (UQA/UQS) 1. Ignition OFF, disconnect the X1and X3 harness connectors at the amplifier. 2. Radio ON, Rear Seat Audio OFF, test for 5.0-7.5 volts between the appropriate speaker circuit terminal listed below and ground. With UQA Left front speaker control- Connector X2, terminal 4 Left front speaker control- Connector X2, terminal 3 Right front speaker control - Connector X2, terminal 2 Right front speaker control - Connector X2, terminal 1 Front center speaker control - Connector X2, terminal 13 (w/ Y91) Front center speaker control - Connector X2, terminal 1 2(w/ Y91) Left subwoofer speaker control- Connector X1, terminal 7 Left subwoofer speaker control- Connector X1, terminal 3 Right subwoofer speaker control- Connector X1, terminal 2 Right subwoofer speaker control- Connector X1, terminal 6
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
With UQS Left front speaker control- Connector X2, terminal 4 Left front speaker control- Connector X2, terminal 5 Right front speaker control - Connector X2, terminal 7 Right front speaker control - Connector X2, terminal 8 Front center speaker control - Connector X2, terminal 13 (w/ Y91) Front center speaker control - Connector X2, terminal 1 2(w/ Y91) Left subwoofer speaker control- Connector X1, terminal 1 Left subwoofer speaker control- Connector X1, terminal 2 Right subwoofer speaker control- Connector X1, terminal 3 Right subwoofer speaker control- Connector X1, terminal 7 If greater than the specified range, test the signal circuit for a short to voltage. If the If less than the specified range, test the signal circuit for a short to ground or an If all circuits test normal, replace the amplifier. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Speaker Replacement Reference Control Module References for Amplifier and Radio replacement, setup, and UNABLE TO CONTACT ONSTAR CALL CENTER Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description The vehicle communication interface module (VCIM) is a 3-watt cellular device that allows the
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
fused, battery positive, voltage circuit connected through the vehicle wiring to the 3-button Diagnostic Aids The customer concern may have been due to a lack of cellular service in a given area. A If an OnStar® emergency call is able to successfully connect the vehicle to the OnStar® If the prompt "OnStar® request ended" is heard, without pressing the white dot button at Reference Information Schematic Reference OnStar Schematics Connector End View Reference
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Component Connector End Views Description and Operation OnStar Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References Circuit/System Verification 1. Press the OnStar® Call Center button. Verify a connection is not made with the OnStar® Call Center. If a connection is made with the OnStar® Call Center, go to Diagnostic Aids. 2. Listen for other tones or cellular messages rather than the normal progression tones or the Unable to Contact OnStar® prompt. If no other tones or cellular messages are heard other than the normal progression tones 3. Record all messages heard from the OnStar® Call Center button press. 4. Press the OnStar® emergency button. Verify a connection to the OnStar® Call Center is made within 10 minutes. IMPORTANT: It is important to have the vehicle in an open outside area Placing an emergency call to the OnStar® Call Center should
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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