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Chevrolet Silverado / GMC Sierra. Manual - part 2235
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Test or repair open, short to ground or short to voltage on the RSA ground circuit and battery
positive voltage circuit.
If all circuits test normal, replace the rear HVAC control module.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Rear Seat Audio Control Replacement
RADIO DISPLAYS CAL OR CAL ERR
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.
Reference Information
Schematic Reference
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Radio/Audio System 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 for scan tool information
Circuit/System Testing
Ignition ON, with a scan tool, reprogram the radio.
If the radio still displays CAL ERR after performing the reprogramming procedure, replace
the radio.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for Radio replacement, setup, and programming
RADIO DISPLAYS LOC, LOCKED, OR CODE
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.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Reference Information
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Radio/Audio System 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 for scan tool information
Circuit/System Testing
Ignition ON, with a scan tool, reprogram the radio.
If the radio still displays LOCKED after performing the reprogramming procedure, replace
the radio.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for Radio replacement, setup, and programming
RADIO POOR RECEPTION
Diagnostic Instructions
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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
AM and FM radio reception is dependent on the following components:
Radio antenna
Coax cable between the radio antenna and the radio antenna module (if equipped).
Radio antenna module (if equipped)
Coax cable between the radio antenna module and the radio
Radio
Diagnostic Aids
Poor AM and FM radio reception is dependent on multiple influences, some of which may not be
vehicle related. Areas which have high RF traffic or block the signal path may cause a
degradation in radio reception. Radio reception may also be influenced by items within the
vehicle, but not part of the radio system. Such examples are aftermarket electrical accessories or
other items which may generated noise in the vehicle electrical system.
Diagnosing a poor reception concern will require a systematic approach to isolating the cause.
Individual components should each be tested before proceeding with any repair or replacement.
Using a Test Antenna
Use a test mast antenna to check for poor vehicle antenna operation. Disconnect the antenna coax
from the radio and plug the test antenna into the radio. Make sure the test antenna base is
grounded to the vehicle chassis and keep hands off the mast. Check radio reception in an area
away from electrical interferences. Tune to several weak and strong AM and FM stations. If the
radio reception improved, the problem exists with the vehicle antenna and/or lead-in cable.
Reference Information
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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