AutoCodes – Generic – B0283:05

B0283:05 Code - Electric Rear Defrost Circuit Malfunction High Voltage/Open

Quick Answer

When the rear heated rear window switch is pressed and the engine is running, the rear window defogger grid will activate and will turn off automatically depending upon the vehicle's speed. Common causes include Faulty Rear Defogger Relay, Rear Defogger Relay harness is open or shorted, Rear Defogger Relay circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0283:05 indicates Electric Rear Defrost Circuit Malfunction High Voltage/Open.
Common causes: Common causes include Faulty Rear Defogger Relay, Rear Defogger Relay harness is open or shorted, Rear Defogger Relay circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,803

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 12, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B0283:05 Description

When the rear heated rear window switch is pressed and the engine is running, the rear window defogger grid will activate and will turn off automatically depending upon the vehicle's speed. The Heating, Ventilation, and Air Conditioning (HVAC) Control Module monitors the voltage level on the supply voltage circuit of the rear window defogger. The HVAC tests 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 the system voltage. The Diagnostic Trouble Code (DTC) will be set when the Electric Rear Defrost Control Circuit is open or short to battery.

OBDII Code B0283:05 - Electric Rear Defrost Circuit Malfunction High Voltage/Open - AutoCodes.com — B0283:05 Code - Electric Rear Defrost Circuit Malfunction High Voltage/Open

What does this mean?

What are the Possible Causes of the DTC B0283:05?

Faulty Rear Defogger Relay
Rear Defogger Relay harness is open or shorted
Rear Defogger Relay circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0283:05?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0283:05 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.