Chevrolet Trax: DTC B2485: Wireless communication (BT) antenna
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 02
Wireless Communication (BT) Antenna Circuit Short to Ground
DTC B2485 04
Wireless Communication (BT) Antenna Circuit Open
Diagnostic Fault Information
Circuit/System Description
Bluetooth wireless technology is a short-range communications technology
intended to replace the cables
connecting portable and/or fixed devices while maintaining high levels of
security. The operating range of the
signal is approximately 30 feet.
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.
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.
Diagnostic Aids
Verify the mobile device is properly configured for the feature being used.
Refer to the device
manufacturers information.
- Verify the function/feature that is being used is supported by the
mobile device.
- The device must be paired to the telematics communication interface
control module to use the available
Bluetooth feature(s). The pairing process must only be performed once for
each device, unless that
device's information is deleted.
- The system can store pairing information for multiple devices, but can
only be actively connected to one
at any given time.
Reference Information
Schematic Reference
OnStar/Telematics Schematics (Encore), OnStar/Telematics Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
OnStar Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Special Tools
EL-50334-20 Multi-Media Interface Tester (Multi-Media Interface Tool)
Circuit/System Testing
- Verify that the T4S Wireless Communication Antenna - Bluetooth is
properly connected to the K73
Telematics Communication Interface Control Module and is not damaged.
If the antenna is disconnected
Connect the T4S Wireless Communication Antenna - Bluetooth to the module.
If the antenna is damaged
Test or replace the T4S Wireless Communication Antenna - Bluetooth .
- If the antenna is connected and not damaged
NOTE: The Multi-Media Interface Tool tool can be used to test
either cellular
phone or streaming audio functions. Refer to the tool instructions, and
perform the appropriate test(s) related to the customers concern in the
following steps.
- Ignition ON, infotainment system ON.
- Verify the infotainment system successfully pairs with the Multi-Media
Interface Tool.
If the infotainment system does not successfully pair with the Multi-Media
Interface Tool.
- Test or replace the T4S Wireless Communication Antenna - Bluetooth .
- Clear the DTC, ignition OFF.
- Ignition ON.
- Verify the DTC is not set.
- If the DTC is set, replace the K73 Telematics Communication Interface
Control Module.
- If the DTC is not set
- All OK.
If the infotainment system successfully pairs with the Multi-Media
Interface Tool.
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for telematics communication interface control module
replacement,
programming and setup.
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
Service Manuals
Service Manuals have the diagnosis
and repair information on the
engines, transmission, axle,
suspension, brakes, electrical,
steering, body, etc.
Service Bulletins
Service Bulletins give additional
technical service information
needed to knowledgeably service
General Motors cars and
Some images and explanations may
vary by phone operating systems,
versions, and/or application (App)
versions.
Using Stitcher
Install the Stitcher application on
the smartphone.
Connect the smartphone to the
infotainment system through the
USB port or Bluetooth wireless
technology.
iPhone: