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DTC B0283 > < Adhesives, Fluids, Lubricants, and Sealers

Astra J

Rear Window Defogger Malfunction

Diagnostic Instructions

•  Perform the prior to Diagnostic System Check - Vehicle 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.

Diagnostic Fault Information



Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance

Rear Window Defogger Relay Switch B+
1
1
-
-

HVAC Control
U1510 00
U1510 00
U1510 00
-

Rear Window Defogger Relay Control
B0283 02
B0283 05
B0283 05
-

Rear Window Defogger Grid Control
1
1
2
-

Rear Window Defogger Relay Coil Ground
-
1
1
-

Rear Window Defogger Grid Ground
-
1
1
-

1. Rear Defogger Inoperative

2. Rear Defogger Always ON
 

Circuit/System Description

When the HVAC control module receives a rear window defog request from the HVAC control faceplate, the HVAC control module will supply voltage to the relay coil. Battery positive voltage is supplied at all times to the relay switched input and the relay coil is always grounded. When the relay is energized, current from the relay switched input will to flow through the switch contacts and out the relay switched output to the rear window defogger grid.

Diagnostic Aids

The rear window defogger indicator will still function when the rear defogger switch is pressed, but any of the following conditions may cause the rear window defogger grid not to function:

•  The battery state of charge is out of range causing the HVAC control module to suspend the rear window defogger operation.
•  The remote start enable ambient temperature is greater than 5°C (40°F).

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


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Engine running, observe the scan tool instrument cluster Rear Defogger Switch parameter while pressing the E18 Rear Defogger Grid switch in the HVAC control.
⇒ If the value is always Inactive or always Active, replace the K33 HVAC Control Module.
2. Command the Illuminate All Indicators ON and OFF with a scan tool. The defog indicator should turn ON or OFF while changing between the commanded states.
⇒ If the defog indicator is always ON or always OFF, replace the K33 HVAC Control Module.
3. Command the E18 Rear Defogger Grid ON and OFF with a scan tool, the E18 Rear Defogger Grid should turn ON or OFF while changing between the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the KR5 Rear Defogger Relay.
2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.
⇒ If greater than the specified range, test the ground circuit for an open/high resistance.
3. Engine running, verify a test lamp does not illuminate between the control circuit terminal 5 and ground.
⇒ If the test lamp illuminates, test the control circuit for a short to voltage.
4. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground
⇒ If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. Ignition OFF, disconnect the X2 harness connector at the E18 Rear Defogger Grid.
6. Test for less than 5 Ω between the ground circuit terminal 1 and ground
⇒ If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the X2 harness connector at the E18 Rear Defogger Grid.
8. Connect a 40 A fused jumper wire between the B+ circuit terminal 3 and the control circuit terminal 5 of the KR5 Rear Defogger Relay. Verify the E18 Rear Defogger Grid is activated.
⇒ If the E18 Rear Defogger Grid does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the E18 Rear Defogger Grid.
⇒ If the E18 Rear Defogger Grid does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the E18 Rear Defogger Grid.
9. Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 2.
10. Engine running, command the E18 Rear Defogger Grid 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 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.
11. If all circuits test normal, test or replace the KR5 Rear Defogger Relay .

Component Testing

Rear Window Defogger Grid Test

1. Engine running, turn on the E18 Rear Defogger Grid.
2. Verify that a test lamp illuminates between each E18 Rear Defogger Grid line and ground. The test lamp should be off when testing at the ground side of the grid and get brighter as the test lamp moves closer to the voltage supply side of the grid. The test lamp should be dim when testing each grid line in the middle.
⇒ If the test lamp remains bright at the middle of the grid line, test for an open between the test point and the ground side of the grid.
⇒ If the test lamp remains off at the middle of the grid line, test for an open between the test point and the voltage side of the grid.

Relay Test

1. Ignition OFF, disconnect the KR5 Rear Defogger Relay.
2. Test for 60-180 Ω between terminals 1 and 2.
⇒ If the resistance is not within the specified range, replace the KR5 Rear Defogger Relay.
3. Test for infinite resistance between the following terminals:
  •  3 and 2
  •  3 and 5
  •  3 and 1
  •  1 and 5
⇒ If not the specified value, replace the KR5 Rear Defogger Relay.
4. Install a 5 A fused jumper wire between relay terminal 2 and 12 V. Install a jumper wire between relay terminal 1 and ground. Test for less than 2 Ω between terminals 3 and 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.

•  Control Module References for instrument cluster replacement, setup and programming

DTC B0283 > < Adhesives, Fluids, Lubricants, and Sealers