2010 Cadillac CTS Sedan AWD V6-3.6L Page 479
Circuit/System Description
Without RPO UAV
The vehicle communication interface module (VCIM) uses the cellular phone microphone to allow driver communication with OnStar.
With RPO UAV
The vehicle communication interface module (VCIM) and navigation radio use the cellular phone microphone to allow driver communication with
OnStar, as well as to operate the voice recognition/voice guidance feature of the navigation radio.
Conditions for Running the DTC
* The ignition must be in the RUN or ACC position.
* The system voltage is at least 9.5 volts and no more than 15.5 volts.
* All the above conditions are present for greater than 10 seconds.
Conditions for Setting the DTC
B2455 01
A short to battery is detected on the cellular microphone signal circuit
B2455 02
A short to ground is detected on the cellular microphone signal circuit
B2455 04
A open circuit is detected on the cellular microphone signal circuit
Action Taken When the DTC Sets
* The VCIM and/or navigation radio (RPO UAV) will not receive any signal from the microphone.
* The OnStar status LED turns red.
* Voice recognition will be inoperative
Conditions for Clearing the DTC
* A current DTC clears when the condition for setting the DTC is no longer present.
* A history DTC clears after 50 malfunction-free ignition cycles.
Reference Information
Schematic Reference
OnStar Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/OnStar Schematics)
Connector End View Reference
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/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Circuit/System Testing
Without RPO UAV
1. Ignition OFF, disconnect the harness connector at the cellular microphone.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground.
