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DTC B2476 or B2482

DTC B2476 or B2482

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 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 Short to Ground Open/High Resistance Short to Voltage Signal Performance
10 V Reference - B2476 04 - -
Control Terminal 6 1 1 2 -
Control Terminal 7 1 1 2 -
Signal Terminal 3 3 3 - B2476 59, B2482 00
Ground - B2476 04 - -
1. OnStar® LED Inoperative 2. LED Illuminated At All Times 3. OnStar® Buttons Inoperative


Circuit/System Description

The OnStar®button assembly consists of 3 buttons, Call/Answer, OnStar®Call Center, and OnStar®Emergency. The telematics communication interface control module supplies the OnStar®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 telematics communication interface control module over the keypad signal circuit. Depending upon the voltage range returned, the telematics communication interface control module 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 telematics communication interface control module detects an open/high resistance on the keypad supply voltage circuit.

B2482 and B2476 59

The telematics communication interface control module detects a valid signal on the keypad signal circuit for longer than 15 seconds. If one of the OnStar® buttons is held or stuck for 15 seconds or greater, the telematics communication interface control module will set this DTC.

Action Taken When the DTC Sets


The OnStar® status LED turns red.

No calls can be placed.

The telematics communication interface control module will ignore all inputs from the OnStar® button assembly.


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.


Reference Information

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 A10 inside rearview mirror.

2. Test for less than 15 Ω between the mirror ground circuit terminal listed below and ground:

Terminal 5 (-UVC)

Terminal 8 (UVC)

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Test for 500-900 Ω between the keypad signal circuit terminal listed below and ground:

Terminal 3 (-UVC)

Terminal 11 (UVC)

5. If less than the specified range, test the keypad signal circuit for a short to ground. If the circuit tests normal, replace the K73 telematics communication interface control module.

6. If greater than the specified range, test the keypad signal circuit for an open/high resistance. If the circuit tests normal, replace the K73 telematics communication interface control module.

7. Ignition ON, test for 9.5-10.5 V between the keypad supply voltage circuit terminal listed below and ground:

Terminal 4 (-UVC)

Terminal 12 (UVC)

8. If less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K73 telematics communication interface control module.

9. If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.

10. Test for less than 1 V between the keypad signal circuit terminal listed below and ground:

Terminal 3 (-UVC)

Terminal 11 (UVC)

11. If greater than the specified range, test the keypad signal circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.

12. If all circuits test normal, replace the A10 inside rearview mirror.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Inside Rearview Mirror Replacement

Control Module References for telematics communication interface control module replacement, setup and programming