Diagnostic Instructions
DTC Descriptors
DTC B2485 02: Wireless Communication Antenna Circuit (Bluetooth) Short to Ground
DTC B2485 04: Wireless Communication Antenna Circuit (Bluetooth) Open Circuit
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
| • | Battery voltage must be between 9-16 volts. |
| • | The CIM tests the antenna once every second. |
Conditions for Setting the DTC
B2485 02
The CIM detects a short to ground in the Bluetooth ® antenna.
B2485 04
The CIM detects 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
OnStar Schematics
Connector End View Reference
Component Connector End Views
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.
| ⇒ | If the antenna is disconnected or damaged, repair or replace as necessary. |
- Ignition ON, verify the DTC B2485 is not set.
| ⇒ | 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.
