For 1990-2009 cars only
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 provide an overview of each diagnostic category. |
DTC Descriptors
DTC B2485 : Wireless Communication Antenna Circuit (Bluetooth)Circuit/System Description
The Bluetooth ® antenna is a small fixed antenna connected directly to the communication interface module (CIM) and is used to send and receive signals from a Bluetooth ® enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.
Conditions for Running the DTC
| • | Ignition ON. |
| • | Battery voltage must be between 9-16 volts. |
| • | The CIM tests the antenna once every second. |
Conditions for Setting the DTC
The CIM detects a short to ground or an open/high resistance in the Bluetooth ® antenna.
Actions Taken When the DTC Sets
| • | The OnStar ® status LED turns red. |
| • | Bluetooth ® functionality is disabled. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Schematic Reference
Connector End View Reference
Description and Operation
OnStar Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Verify the Bluetooth ® antenna is properly connected to the CIM and is not damaged.
- Ignition ON, verify the DTC B2485 is not set.
| ⇒ | If the antenna is disconnected or damaged, repair or replace as necessary. |
| ⇒ | If the DTC is set, replace the Bluetooth ® antenna. Clear the DTC and cycle the ignition OFF then back ON. If the DTC resets as current, replace the CIM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for CIM replacement, setup, and programming |
