LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2013 >> Encore Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 95 (Fixed And MOVEABLE Window System) >> Diagnostic Information and Procedures >> DTC B0283: Rear Defrost >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Chevrolet Trax and 2016 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal C5 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Connect the X2 harness connector at the X50A Fuse Block-Underhood. Disconnect the X2 harness connector at the K33 HVAC Control Module, ignition ON.
  4. Verify the E18 Rear Defogger Grid is not activated.
    • If the E18 Rear Defogger Grid is activated 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
    2. Test for less than 1 V between the K33 HVAC Control Module control circuit terminal 19 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X50A Fuse Block-Underhood.
    • If the E18 Rear Defogger Grid is not activated 
  5. Connect a 3 A fused jumper wire between the control circuit terminal 19 and B+.
  6. Verify the E18 Rear Defogger Grid activates.
    • If the E18 Rear Defogger Grid does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block-Underhood, ignition ON.
    2. Test for infinite resistance between the K33 HVAC Control Module control circuit terminal 19 and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X50A Fuse Block-Underhood.
    • If the E18 Rear Defogger Grid activates 
  7. Replace the K33 HVAC Control Module.
scientia non olet · About LEMON Manuals