Chevrolet Trax: DTC B1265: Switched 14 volt performance short to ground

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 Descriptor

DTC B1265 02

Switched 14 Volt Performance Short to Ground

Diagnostic Fault Information

Circuit/System Description

When the radio is on, a discrete 12 V signal is supplied on the entertainment remote enable circuit to the audio amplifier and the Color/Navigation Info Display Module (if equipped). This signal is used to control the power state of the components.

Conditions for Running the DTC

The following are conditions that must be present in order for the radio to enable diagnostics:

• The radio is ON.
• The system voltage is 9 -16 V

Conditions for Setting the DTC

• The radio detects a short to ground on the entertainment remote enable circuit.
• The above condition is present for greater than 250 ms.

Action Taken When the DTC Sets

• The radio implements a current limiting mode and disables the output on the entertainment remote enable circuit .
• All components connected on the entertainment remote enable circuit will be inoperative

Conditions for Clearing the DTC

• The condition for setting the DTC no longer exists.
• After the ignition has been OFF for a sufficient amount of time to allow the radio to enter a low power/sleep state, the radio will re-enable the output on the following ignition cycle and the DTC will become history.
• A history DTC clears after 50 malfunction-free ignition cycles.

Diagnostic Aids

• This DTC may be stored as a history DTC without affecting the operation of the radio/infotainment systems.
• The radio's current limiting logic may not re-enable the output on the entertainment remote enable circuit until after the radio performs a full power-down. It may be necessary to wait 5 min between each test attempt with the key OFF and retained accessory power OFF.

Reference Information

Schematic Reference

Radio/Navigation System Schematics (Encore), Radio/Navigation System 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

Radio/Audio System Description and Operation (with Monochrome Display), Radio/Audio System Description and Operation (with Color Display)

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, radio OFF, radio B+ fuse removed. Disconnect all of the harness connectors listed below:

• T3 Audio Amplifier X3 (if equipped)
• P17 Info Display Module X1 (if equipped)

2. Install the radio B+ fuse. Ignition ON, A11 Radio ON.
3. Verify that a test lamp illuminates between the control circuit terminals listed below and ground:

• T3 Audio Amplifier X3 terminal 8 (if equipped)
• P17 Info Display Module X1 terminal 6 (if equipped)

If the test lamp does not illuminate

1. Ignition OFF. Disconnect the X1 harness at the A11 Radio.
2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance.

3. Test for less than 2 ohms in the control circuit end to end.

• If greater than 2 ohms, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 Radio.

If the test lamp illuminates.

4. Verify that DTC B1265 does NOT set as each component is connected one at a time.

If DTC B1265 sets.

Replace the module/component that was just connected

If DTC B1265 does not set.

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Driver Information Display Replacement (UAG) , Driver Information Display Replacement (UDN)
• Control Module References for radio and amplifier replacement, programming, and setup.

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