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Home >> Chevrolet >> 2014 >> Captiva Sport LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Lighting System) >> Diagnostic Information and Procedures >> DTC B3445 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Captiva Sport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X4 harness connector at the BCM.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the X4 harness connector at the BCM.
  4. Disconnect the stop lamp relay.
  5. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal 86 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Disconnect the harness connector at the center high mounted stop lamp (CHMSL).
  7. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  8. Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 2.
  9. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. 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.
  10. Ignition OFF, connect a test lamp between terminal 85 and terminal 86 at the fuse block - underhood.
  11. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not turn ON and OFF when commanded, replace the fuse block - underhood.
  12. If all circuits test normal, replace the stop lamp relay.
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