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Home >> Suzuki >> 1991 >> Samurai JS >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Glass/Windows/Mirrors) >> Diagnostic Information and Procedures >> Rear Window Defogger Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the REAR DEFOG relay.
  2. Ignition OFF, test for less than 1.0 Ω of resistance between the relay coil ground circuit terminal 25 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 relay controlled output circuit terminal 46 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 relay switch B+ circuit terminal 43 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the RR DEFOG circuit fuse is open, test the relay controlled output circuit terminal 46 for a short to ground
  5. Ignition OFF, disconnect the harness connectors C1 and C2 at the Rear Defogger Grid.
  6. Ignition OFF, test for less than 1.0 Ω of resistance between the Rear Defogger Grid ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connectors at the Rear Defogger Grid.
  8. Ignition ON, connect a 30-A fused jumper wire between the relay switch B+ circuit terminal 43 and the relay controlled output circuit terminal 46. Verify the Rear Defogger Grid is activated.
    • If the Rear Defogger Grid does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the Rear Defogger Grid.
  9. Connect a test lamp between the relay coil control circuit terminal 39 and the relay coil ground circuit terminal 25.
  10. Command the Rear Defogger Grid ON and OFF by pressing the Rear Defogger Switch. 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.
  11. If all circuits test normal, test or replace the DEFOG Relay.
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