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DTC B0283

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0283 00: Electric Rear Defrost Circuit

DTC B0283 02: Electric Rear Defrost Circuit Short To Ground

DTC B0283 05: Electric Rear Defrost Circuit Short to Battery or Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Rear Demist Relay Control

B0283 00, B0283 02

B0283 05

B0283 05

--

Relay Coil Ground

-

B0283 05

--

--

Circuit/System Description

When the rear defogger button is pressed, voltage is supplied to the relay coil by the BCM (C60) or the HVAC control module (C68). Battery positive voltage is supplied at all times to the relay switched input and the relay coil is always grounded. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the window defogger grids.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

B0283 00

The BCM detects a short to ground in the relay control circuit.

B0283 02

The HVAC control module detects a short to ground in the relay control circuit.

B0283 05

The HVAC control module detects a short to voltage or an open/high resistance in the relay control circuit or an open/high resistance in the relay ground circuit.

Action Taken When the DTC Sets

The defogger grids will malfunction

Conditions for Clearing the DTC
    • The DTC clears when the fault is no longer detected.
    • The current DTC will become history when the request for the output is removed.
    • The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Defogger Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Rear Window Defogger Description and Operation

Electrical Information Reference

    •  Testing for Intermittent Conditions and Poor Connections
    •  Circuit Testing
    •  Wiring Repairs
    •  Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Ignition ON, for the C60 HVAC system, observe the operation of the E18 rear window defogger grid and the E49 windshield defogger grid while pressing and depressing the rear defog switch. The E18 rear window defogger grid and the E49 windshield defogger grid should turn ON and OFF each time the switch is pressed and depressed.
    2. ⇒If the defogger grids are always ON or always OFF, refer to C60 HVAC.
  2. Ignition ON, for the C68 HVAC system, command the Rear Defog Request ON and OFF with a scan tool. The E18 rear window defogger grid and the E49 windshield defogger grid should turn ON and OFF when changing between the commanded states.
    3. ⇒If the defogger grids are always ON or always OFF, refer to C68 HVAC.

Circuit/System Testing

C60 HVAC

  1. Ignition OFF, disconnect the KR5 rear defogger relay.
  2. Test for less than 10 Ω between the ground circuit terminal 86 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
  4. Ignition ON, command the rear window defogger ON and OFF by pressing and depressing the defogger switch. The test lamp should turn ON and OFF when changing between the commanded states.
    5. ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
    ⇒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 K9 BCM.
  5. If all circuits test normal, test or replace the KR5 rear defogger relay.

C68 HVAC

  1. Ignition OFF, disconnect the KR5 rear defogger relay.
  2. Test for less than 10 Ω between the ground circuit terminal 86 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
  4. Ignition ON, command the Rear Demist Request ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    5. ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K33 HVAC control module.
    ⇒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 K33 HVAC control module.
  5. If all circuits test normal, test or replace the KR5 rear defogger relay.

Component Testing

Relay Test

  1. Ignition OFF, disconnect the KR5 rear defogger relay.
  2. Test for 60 - 180 Ω between terminals 85 and 86.
    3. ⇒If not within the specified range, replace the KR5 rear defogger relay.
  3. Test for infinite resistance between the following terminals:
    4. • 30 and 86
    • 30 and 87
    • 30 and 95
    • 85 and 87
         ⇒If not the specified value, replace the KR5 rear defogger relay.
  4. Install a 5A fused jumper wire between the relay terminal 85 12V. Install a jumper wire between the relay terminal 86 and ground. Test for less than 2 Ω between terminals 30 and 87.
    5. ⇒If greater than the specified range, replace the KR5 rear defogger relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement : Within an Electrical Center → Attached to Wire Harness
    • Control Module References for BCM or HVAC control module replacement, programming and setup
   


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