Service Information

Volt

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 provide an overview of each diagnostic category.

DTC Descriptors

DTC B2485 02: Wireless Communication Aerial Circuit Short to Ground

DTC B2485 04: Wireless Communication Aerial Circuit Open

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Signal	B2485 02	B2485 04	--	--

The Bluetooth aerial is a small fixed aerial connected directly to the mobile telephone control module and is used to send and receive signals from a Bluetooth enabled cellular phone. The aerial is 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 mobile telephone control module tests the aerial 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.

Action Taken When the DTC Sets

The Bluetooth communication can not be establish.

Conditions for Clearing the DTC

The DTC will become history when the condition for setting the DTC is no longer present.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Circuit/System Testing

Replace the T4S Wireless Communication Aerial - Bluetooth.
Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC B2485 does not set.

⇒	If the DTC sets, replace the K82 Mobile Telephone Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for mobile telephone control module replacement, programming and setup