Service Information

Volt

DTC B1265

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

When the radio is on, a discrete 12 V signal is supplied on the entertainment remote enable circuit to the Audio Amplifier and the Information Display Module. 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 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 will 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 minutes with the key OFF and retained accessory power OFF for the radio to re-enable this output.

Reference Information

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

Vehicle OFF, radio OFF, radio B+ fuse removed, disconnect all of the connectors listed below:

•	T3 Audio Amplifier X2

•	P17 Information Display Module X1 (display screen)

Reinstall the radio B+ fuse. Vehicle in Service Mode, radio ON, verify that a test lamp illuminates between the entertainment remote enable circuit terminals listed below and ground:

•	T3 Audio Amplifier X2 terminal 14

•	P17 Information Display Module X1 terminal 6

⇒	If the test lamp does not illuminate, test the entertainment remote enable circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the radio.

Re-connect the X2 harness connector at the T3 audio amplifier. Verify that DTC B1265 does NOT set as current.

⇒	If DTC B1265 sets as current, replace the T3 audio amplifier.

Re-connect the X1 harness connector at the P17 information display module. Verify that DTC B1265 does NOT set as current.

⇒	If DTC B1265 sets as current, replace the P17 information display module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

•	Driver Information Display Replacement

•	Control Module References for radio and amplifier replacement, programming and setup