2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 628

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 628

DTC B2476 or B2482

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 B2476 04

- Cellular Phone Select Service Switch Open Circuit

DTC B2476 59

- Cellular Phone Select Service Switch Stuck Button

DTC B2482 00

- Cellular Phone Select Service Switch Range/Performance

Diagnostic Fault Information

Circuit/System Description

The OnStar(R) button assembly consists of 3 buttons, Call/Answer, OnStar(R) Call Center, and OnStar(R) Emergency. The communication

interface module (CIM) supplies the OnStar(R) button assembly with 10 V via the keypad supply voltage circuit. Each of the buttons, when

pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the CIM over the keypad signal circuit. Depending upon

the voltage range returned, the CIM is able to identify which button has been activated.

Conditions for Running the DTC

* Ignition ON.

* Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B2476 04

The CIM detects an open/high resistance on the keypad supply voltage circuit.

B2482 and B2476 59

The CIM detects a valid signal on the keypad signal circuit for longer than 15 seconds. If one of the OnStar(R) buttons is held or stuck for 15

seconds or greater, the CIM will set this DTC.

Action Taken When the DTC Sets

* The OnStar(R) status LED turns red.

* No calls can be placed.

* The CIM will ignore all inputs from the OnStar(R) button assembly.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.