B1265
DTC B1265
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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 control the power state of the other infotainment system components. Dependant upon vehicle equipment, the remote enable circuit may control one or more of the following:
* Audio Amplifier
* Color Information Display (UDY)
* Subwoofer (convertible with UQ3)
* Rear Spoiler Antenna (UB3)
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 minutes with the key OFF and retained accessory power OFF for the radio to re-enable this output.
Reference Information
Schematic Reference
Radio/Navigation System Schematics Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Radio/Audio System Description and Operation (with Monochrome Display) Radio/Audio System Description and Operation (with Monochrome Display)Radio/Audio System Description and Operation (with Color Display) Radio/Audio System Description and Operation (with Color Display)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
1. Vehicle OFF, radio OFF, radio B+ fuse removed, disconnect all of the connectors listed below:
* T3 Audio Amplifier X3
* P9 Information Display (UDY)
* Subwoofer (convertible with UQ3)
* Rear Spoiler Antenna (UB3)
2. Install the radio B+ fuse. Vehicle in Service Mode, A11 radio ON.
3. Verify that a test lamp illuminates between the entertainment remote enable circuit terminals listed below and ground:
* T3 Audio Amplifier X3 terminal 1
* P9 Information Display (UDY) terminal 18
* Subwoofer (convertible with UQ3) terminal 7
* Rear Spoiler Antenna (UB3) terminal A
• If the test lamp does not illuminate.
1. Vehicle 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 Verification Tests after completing the repair.
* Radio Control Assembly Replacement Radio Control Assembly Replacement
* Radio Antenna Module Replacement (Coupe) Radio Antenna Module Replacement (Coupe)
* Control Module References Control Module References for radio and amplifier replacement, programming and setup.