LEMON Manuals: Even more car manuals for everyone
Home >> Suzuki >> 2012 >> Equator Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2575 >> 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 ON, automatic head lights OFF, verify the scan tool LOW BEAM PCB relay command parameter displays ON with the head lamp switch in the ON position.
    • If the scan tool displays OFF, test the head lamp switch portion of the multifunction switch head lamps ON signal circuit terminal C1 pin 2 and head lamp switch ground circuit terminal C1 pin 1 for a short to voltage or an open/high resistance. If the circuits test normal, replace the multifunction switch.
  2. Ignition OFF, disconnect the LOW BEAM PCB relay at the C2 pin 18 terminal (low beam relay control circuit coil side) of the Underhood Fuseblock.
  3. Verify that a test lamp illuminates between the underhood fuseblock B+ circuit on the coil side and switch side of the relay when connected to ground.
    • If the test lamp does not illuminate, test the underhood fuseblock B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the left and right low beam supply voltage circuits for a short to ground. If the circuits test normal replace the appropriate head lamp assembly.
  4. Disconnect the harness connector at an inoperative head lamp assembly.
  5. Test for less than 1.0 Ω of resistance between the inoperative head lamp ground circuit terminal 2 and ground.
    • If greater than 1.0 Ω, test the ground circuit for an open/high resistance.
  6. Connect the harness connector at the head lamp.
  7. Connect a 30-amp fused jumper wire between the B+ circuit terminal and the appropriate head lamp supply voltage circuit terminal of the low beam head lamp. Verify the head lamps illuminate.
    • If the head lamps do not illuminate, test the left and right head lamp supply voltage circuits for an open/high resistance. If the circuits test normal, replace the inoperative head lamp assembly.
  8. Connect a test lamp between the underhood fuseblock B+ circuit terminal of the relay and the Low Beam relay control terminal C2 pin 18 circuit terminal.
  9. Command the LOW BEAM PCB 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 OFF, test the low beam relay control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  10. If all circuits test normal, replace the underhood fuseblock.
scientia non olet · About LEMON Manuals