B0283

DTC B0283

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* 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.

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 after completing the diagnostic procedure. Verification Tests

* Liftgate Window Replacement