DTC B2485
DTC B2485 |
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 B2485 02
Wireless Communication (BT) Antenna Circuit Short to Ground
DTC B2485 04
Wireless Communication (BT) Antenna Circuit Open
Diagnostic Fault Information |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Signal | B2485 02 | B2485 04 | - | - |
Circuit/System Description |
The Bluetooth ® antenna is a small fixed antenna connected directly to the telematics communication interface control module 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 |
• |
The ignition is in OFF, ACCESSORY or RUN position.
|
• |
The system voltage is between 9-16 V.
|
• |
The telematics communication interface control module tests the antenna once every second.
|
Conditions for Setting the DTC |
B2485 02
• |
The signal voltage is less than 1 V.
|
• |
The above conditions must be met for 500 ms.
|
B2485 04
• |
The signal voltage is greater than 2 V.
|
• |
The above conditions must be met for 500 ms.
|
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.
|
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
|
Circuit/System Testing |
1. |
Verify the Bluetooth ® antenna is properly connected to the K73 telematics communication interface control module and is not damaged.
|
2. |
If the antenna is disconnected or damaged, repair or replace as necessary.
|
3. |
Ignition ON, verify the DTC B2485 is not set.
|
4. |
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 K73 telematics communication interface control module.
|
Repair Instructions |
Perform the Diagnostic Repair Verification
• |
Wireless Communication Interface Antenna Replacement
|
• |
Control module, references
for replacement, setup and programming of the telematic module for communication interface
|