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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 222 (Fixed And MOVEABLE Window System) >> Diagnostic Information and Procedures >> DTC B0283: Rear Defogger Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    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. Disconnect Ground Connection
    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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