LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2007 >> XL7 Limited, AWD >> Repair and Diagnosis >> Body & Frame >> Glass/Windows/Mirrors >> Diagnostic Information and Procedures >> DTC B0285 or B0286 >> Circuit/System Testing >> Rear Defogger Malfunction
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Rear Defogger Malfunction

  1. Ignition OFF, disconnect the REAR DEFOG relay.
  2. Ignition OFF, test for less than 1.0 Ω of resistance between the coil side ground circuit terminal and ground.
    • If greater than the specified range, test for an open/high resistance.
  3. Ignition ON, verify that a test lamp does not illuminate between the switch side control circuit terminal and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the switch side B+ circuit terminal and ground.
    • If the test lamp does not illuminate, test the switch side B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the switch side circuit fuse is open, test the switch side control circuit terminal for a short to ground.
  5. Connect a test lamp between the coil side control circuit terminal and the coil side ground circuit terminal.
  6. Command the REAR DEFOG relay 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 BCM.
    • 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 BCM.
  7. If all circuits test normal, test or replace the REAR DEFOG relay.
scientia non olet · About LEMON Manuals