2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 621

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 621

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.

瀚慖f 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.

瀚慖f 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.

瀚慖f 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.