Diagnostic Instructions
DTC Descriptor
DTC B1265 02: Switched 14 Volt Performance Short to Ground
Circuit/System Description
When the navigation radio is on, a discrete 12-volt signal is supplied on the Entertainment Remote Enable Signal circuit to the Display Module, Display Actuator, Antenna module, and Amplifier (UQA). This signal is used to control the power state of the
modules.
Conditions for Running the DTC
The following are conditions that must be present in order for the navigation radio to enable diagnostics:
| • | The ignition must be in the RUN or ACC position. |
| • | The system voltage is at least 9.5 volts and no more than 15.5 volts. |
Conditions for Setting the DTC
| • | The navigation radio detects a short to ground on the Entertainment Remote Enable Signal circuit. |
| • | All the above conditions are present for greater than 250 mS. |
Action Taken When the DTC Sets
The Display Module, Display Module Actuator, Antenna module, and Audio Amplifier (UQA) may become inoperative.
Conditions for Clearing the DTC
| • | The condition for setting the DTC no longer exists. |
| • | 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 navigation radio. |
| • | If stored only as a history DTC and not retrieved as a current DTC, do not replace the navigation radio. |
Reference Information
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Navigation System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Note: The ignition circuit controls multiple modules/components. Each of the modules will need to be disconnected if the ignition circuit test fails for a short to voltage or short to ground. Disconnect one module/component at a time
while testing the ignition circuit for a short to voltage or short to ground. If the fault is no longer present when disconnecting a module/component replace that module/component. If the fault is still present with all the module/component disconnected repair
the circuit.
- Ignition OFF, disconnect one of the connectors listed below at an inoperative module/component:
| • | Audio Amplifier X3 (UQA only) |
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal listed below and ground.
| • | Antenna Module -- terminal 1 |
| • | Radio/HVAC Display X1 -- terminal 4 |
| • | Radio/HVAC Display X2 -- terminal 3 |
| • | Audio Amplifier (UQA only) -- terminal 8 |
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the Radio. |
- If all circuits test normal, replace the module/component that was disconnected in step 1.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
