LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1437 (Fixed And MOVEABLE Window System) >> Diagnostic Information and Procedures >> DTC B0283 >> 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 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the DEFOG relay.
  2. Test for less than 1 ohm between the ground circuit terminal 86 and ground.
    • If greater than the specified range, test ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
  4. Ignition ON, command the Rear Defog Request 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 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 HVAC control module.
  5. If all circuits test normal, test or replace the DEFOG relay.
scientia non olet · About LEMON Manuals