Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
OnStar Description and Operation (See: Accessories and Optional Equipment/Description and Operation/OnStar Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone.
2. Test for less than 10 Ohms between the low reference circuit terminal A and ground.
锟斤拷 If greater than the specified range, test the circuit for an open/high resistance.
3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal B and ground.
锟斤拷 If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CIM.
锟斤拷 If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.
4. If all circuits test normal, replace the B24 cellular phone microphone.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mobile Telephone Microphone Replacement (See: Accessories and Optional Equipment/Cellular Phone/Cellular Phone Microphone/Service
and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for CIM replacement, setup, and programming
Communication Interface Module
DTC B2462 (Communication Interface Module)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2462 02
- Global Positioning System (GPS) Antenna Malfunction Short to Ground
DTC B2462 04
- Global Positioning System (GPS) Antenna Malfunction Open Circuit
Circuit/System Description
The telematics communication interface control module receives information from the cellular phone and navigation antenna located on the outside
of the vehicle. The cellular phone and navigation antenna is connected to the telematics communication interface control module via a shielded
coaxial cable. The antenna cable also provides a path for DC current for powering the cellular phone and navigation antenna.
Conditions for Running the DTC
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