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OnStar Button Malfunction

OnStar Button Malfunction

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.


Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Keypad Supply Voltage B2476 00 B2476 00 B2476 00 -
Keypad Green LED Control 1 1 2 -
Keypad Red LED Control 1 1 2 -
Keypad Signal 3 3 - B2482 00
Inside Rearview Mirror Ground - 1 - -
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.

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 Verification

Note

Contact the OnStar® Call Center first before pressing the emergency button in order to notify them of the test.


Ignition ON, press the OnStar® Call buttons one at the time. Verify that all of the OnStar® buttons operate normally.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the A10 inside rearview mirror.

2. Test for less than 10 Ω between the appropriate 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 appropriate signal circuit terminal listed below and ground:

Terminal 3 (-UVC)

Terminal 11 (UVC)

5. If less than the specified range, test the 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 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 less than 1 V between the signal circuit listed below and ground.

Terminal 3 (-UVC)

Terminal 11 (UVC)

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

9. Test for 8.5-10.5 V between the appropriate 10 V reference circuit terminal listed below and ground:

Terminal 4 (-UVC)

Terminal 12 (UVC)

10. If less than the specified range, test the 10 V reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K73 telematics communication interface control module.

11. If greater than the specified range, test the 10 V reference 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, test or replace the A10 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, programming and setup