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Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the Speaker Malfunction Radio Audio Inoperative at Rear Seat Audio (RSA) Control Radio Displays LOC, LOCKED, or CODE Radio Displays CAL or CAL ERR Radio Poor Reception Radio Controls Inoperative - Rear Seat Video Display is Poor or Blank Video Entertainment System Inoperative Video Entertainment System Remote Control Inoperative Video Entertainment System Wireless Headphone Inoperative SYMPTOMS - NAVIGATION SYSTEMS Perform the Diagnostic System Check - Vehicle before using the symptom tables in order There are no DTCs set. The control modules can communicate via the serial data link. Review Navigation System Description and Operation in order to familiarize yourself Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the navigation system Inspect the easily accessible or visible system components for obvious damage or conditions Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to IMPORTANT: The following steps must be completed before using the symptom tables.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Testing for Intermittent Conditions and Poor Connections . Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the No Global Positioning System (GPS) Reception For radio/audio related symptoms, refer to Symptoms - Entertainment. AUDIO SYSTEM TROUBLESHOOTING HINTS Many conditions that affect radio operation may be corrected without removing the radio from Preliminary Inspections Check for any aftermarket equipment that may have been installed on the vehicle. If Inspect that the antenna connector and the antenna coaxial cable are clean and tight. For reception concerns, first determine if the customer is within the listening area of the Stations at the lower end of the FM band are more susceptible to audio noises than stations If the noise is only from one speaker check for the following before speaker replacement: Isolate the noise using the J 39916-A CD and Cassette Diagnostic Audio Kit. See Inspect the speaker connections to ensure they are clean and tight. Refer to Testing Inspect for a loose or incorrectly installed speaker or surrounding trim. Loose trim can Ignition noise on the FM band may be an indication of an ignition system problem. IMPORTANT: When testing the audio system for poor reception or noise, the vehicle should be outside away from metal buildings and
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Inspect that all vehicle grounds are clean, tight and free of corrosion. Inspect the rear defogger grid lines for large breaks or dark spots. Inspect the connections at the radio antenna module, if equipped, to ensure that they are Compare the customers vehicle to another of similar model and audio system to determine if Identifying Concerns 1. In order to isolate the source of the noise/poor reception, identify the ignition switch position that the concern is most noticeable: 1. Turn the ignition switch to the accessory position. 2. Turn ON the radio. 3. Seek up 88-108 FM then 550-1600 AM. 4. Record the number of valid radio stations where the tuner stops. 5. Repeat these steps with the ignition ON, and the engine OFF then again with the engine running. 2. Return the ignition switch to the position that the concern was most noticeable. 3. Remove fuses or circuit breakers one at a time until the noise has been eliminated. 4. Identify what systems or components are powered by the fuse. 5. Reinstall all fuses and circuit breakers. 6. Disconnect the components powered by the fuse one at a time until the concern has been eliminated. Corrective Action Inspect the ground integrity of the component or system causing the noise. Malfunctioning and marginal components such as relays and solenoids may cause noise Always use a braided ground strap when applying additional grounds and keep the ground If the noise source is found to be coming from the vehicle harness: Route the antenna cable separately from the wire harness that is emitting the noise. Use aluminum or nickel tape in order to shield the antenna cable. Attempt variations of Add only aluminum or nickel tape before adding a ground strap to the tape.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Wrap a ground strap 360 degrees around the tape, securing the other end of the Capacitors work best on switch pops and low frequency noise. Filters work best on high frequency whines and static. After adding any suppression device, inspect all of the vehicle systems for proper operation Whenever possible, make a test harness that includes filters or capacitors. Always inspect If an audible pop is caused due to operating a switch, perform the following repairs as Add a capacitor across the contacts of the switch. Add a capacitor from the battery positive voltage (B+) side of the switch to chassis Add a capacitor from the ground side of the switch to chassis ground. Use the following available noise suppression devices: 220 micro farad (50 V) capacitor GM P/N 1227895-Works well for ignition system 0.47 micro farad capacitor GM P/N 1227894-Works well for switches and relays. Feed through capacitor GM P/N 477371-Works well for high current situations. Filter package GM P/N 1224205-Works well for low current situations. Fuel pump suppressor GM P/N 25027405 53.34 cm (21 in) braided ground strap GM P/N 8910791 48.26 cm (19 in) braided ground strap GM P/N 6286800 26.67 cm (10.5 in) braided ground strap GM P/N 6287160 21.59 cm (8.5 in) braided ground strap GM P/N 12091511 Generator Whine Concerns 1. Inspect the ground terminal and cable for high resistance. 2. Inspect the generator and brackets for loose or coated mounting bolts. IMPORTANT: When installing suppression devices, signal wires such as sensor and communication circuits should not be
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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