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Home >> GMC >> 2017 >> Canyon SL >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> DTC B0283: Rear Defogger Circuit >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems » Off
  2. Remove the component:KR5 Rear Defogger Relay
  3. Test for less than 10 Ω between the test points:Ground circuit terminal 85 & Ground
    • If 10 Ω or greater 
    1. Ground Connection»Disconnect
    2. Test for less than 2 Ω between the test points:Ground circuit terminal 85 & Ground Connection
      • 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 
  4. Connect a test lamp between the test points:Control circuit terminal 86 & Ground circuit terminal 85
  5. Ignition » On / Vehicle » In Service Mode
  6. Perform the scan tool control function:Rear Defogger »On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Disconnect the electrical connector:K33 HVAC Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 86 @Relay Socket & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points:Control circuit terminal 86 @Relay Socket & Terminal 19 X2 @Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:K33 HVAC Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Disconnect the electrical connector:K33 HVAC Control Module
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 86@Relay Socket & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K33 HVAC Control Module
    • If the test lamp turns On and Off 
  7. Test or replace the component:KR5 Rear Defogger Relay
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