Fixed and Moveable Windows
DTC B0283
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 B0283
^ Electric Rear Defrost Circuit
Diagnostic Fault Information
Circuit/System Description
The liftgate module (LGM) monitors the voltage level on the supply voltage circuit of the rear window defogger. The LGM will test the supply voltage circuit of the rear window defogger every 160 milliseconds. With the rear window defogger inactive, the supply voltage circuit of the rear window defogger will have no voltage present. With the rear window defogger active, the supply voltage circuit of the rear window defogger will be near system voltage.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
One of the following conditions can cause this DTC to set:
* Battery positive voltage is detected on the supply voltage circuit of the rear window defogger, while the rear window defogger is inactive.
* Low voltage is detected on the supply voltage circuit of the rear window defogger, while the rear window defogger is active.
Action Taken When the DTC Sets
* The liftgate module stores the DTC to memory.
* The rear window defogger will not operate.
Conditions for Clearing the DTC
* This DTC will change from current to history when the fault is no longer present.
* A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
Reference Information
Schematic Reference
Defogger Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Component Connector End Views)
Description and Operation
Rear Window Defogger Description and Operation (Rear Window Defogger Description and Operation)
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 Verification
Command the rear window defogger ON and OFF with the scan tool. The rear window defogger should turn ON and OFF when changing between the commanded states.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector the rear window defogger.
2. Test for less than 1.0 ohm between the ground circuit terminal A and ground.
• If greater than the specified range, test ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal A and ground.
4. Ignition ON, command the rear defogger ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the LGM.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the LGM.
5. If all circuits test normal, replace the rear window defogger grid.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Liftgate Window Replacement (Service and Repair)
* Control Module References (Control Module References) for LGM replacement, setup, and programming