PRE-RELEASE
DTC B2485
| DTC B2485 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| 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 |
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The ignition is in OFF, ACCESSORY or RUN position.
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The system voltage is between 9-16 V.
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The telematics communication interface control module tests the antenna once every second.
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| Conditions for Setting the DTC |
B2485 02
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The signal voltage is less than 1 V.
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The above conditions must be met for 500 ms.
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B2485 04
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The signal voltage is greater than 2 V.
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The above conditions must be met for 500 ms.
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| Actions Taken When the DTC Sets |
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The OnStar ® status LED turns red.
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Bluetooth ® functionality is disabled.
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| Conditions for Clearing the DTC |
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The condition responsible for setting the DTC no longer exists.
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A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
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| Reference Information |
Schematic Reference
OnStar Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
OnStar Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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| Circuit/System Testing |
| 1. |
Verify the Bluetooth ® antenna is properly connected to the K73 telematics communication interface control module and is not damaged.
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| 2. |
If the antenna is disconnected or damaged, repair or replace as necessary.
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| 3. |
Ignition ON, verify the DTC B2485 is not set.
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| 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.
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| Repair Instructions |
Perform the Diagnostic Repair Verification
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Wireless Communication Interface Antenna Replacement
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Control module, references
for replacement, setup and programming of the telematic module for communication interface
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