Chevrolet Silverado / GMC Sierra. Manual — part 2223
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 provide an overview of each diagnostic category.
DTC Descriptor
DTC B2455 04
Cellular Phone Microphone Circuit Malfunction Open Circuit
Diagnostic Fault Information
Circuit/System Description
The communication interface module (CIM) provides the cellular microphone with a supplied
voltage on the cellular microphone signal circuit. When the microphone is in use, voice data from
the user is sent back to the CIM on the signal circuit. The CIM provides a ground for the
microphone via the drain wire.
Conditions for Running the DTC
The ignition must be in the RUN or ACC position.
The system voltage is at least 9.5 volts and no more than 15.5 volts.
All the above conditions are present for greater than 10 seconds.
Conditions for Setting the DTC
The CIM detects an open, short to ground or short to voltage in the cellular microphone
signal circuit for 10 seconds or greater.
The CIM detects an open/high resistance in the drain wire circuit for 10 seconds or greater.
Actions Taken When the DTC Sets
The OnStar® status LED turns red.
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
Cellular Microphone Signal
B2455 04
B2455 04
B2455 04
-
Cellular Microphone Low
Reference
-
B2455 04
1
-
1. OnStar Microphone Inoperative - Caller Cannot Be Heard
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
The CIM will not receive a signal from the microphone.
Calls can be placed but the caller cannot be heard.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists.
A history DTC will clear once 50 consecutive malfunction-free ignition cycles have
occurred.
Schematic Reference
OnStar Schematics
Connector End View Reference
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 for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the cellular microphone.
2. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
3. Ignition ON, test for 9.5-10.5 volts between the signal circuit terminal B and ground.
If greater than the specified range, test the signal circuit for a short to voltage. If the
circuit tests normal, replace the CIM.
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
If less than the specified range, test the signal circuit for a short to ground or an
open/high resistance. If the circuit tests normal, replace the CIM.
4. Test for test for 9.5-10.5 volts between the signal circuit terminal B and the drain circuit
terminal A.
If less than the specified range, test the drain circuit for a short to voltage or an
open/high resistance. If the circuit tests normal, replace the CIM.
5. If all circuits test normal, replace the cellular microphone.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Mobile Telephone Microphone Replacement
Control Module References for CIM replacement, setup, and programming
DTC B2462
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.
DTC Descriptor
DTC B2462
Global Positioning System (GPS) Signal Error
Circuit Description
The global positioning system (GPS) antenna is connected to the navigation radio by a coaxial
cable.
Conditions for Running the DTC
The radio must detect one of the following power modes:
ACC
ON
RAP
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
RAP UNLK
Conditions for Setting the DTC
The navigation radio test the GPS antenna every 10 seconds.
The radio determines there is an open in the GPS antenna.
Actions Taken When the DTC Sets
Unable to get GPS location updated, the radio uses the last reported position and the vehicle
speed signal to calculate the vehicle position.
Route guidance may be inaccurate.
This failure has no effect outside the navigation system.
Conditions for Clearing the DTC
A current DTC clears when the radio does not detect the failure for more than 10 seconds.
A history DTC clears after 50 ignition cycles with no repeat of the failure.
Reference Information
Schematic Reference
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
Circuit/System Testing
2008 Chevrolet Silverado 1500
2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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