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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1941 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> DTC C1106-C1111 >> Circuit/System Testing

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 hill hold vlvs relay.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 85 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the hill hold relay.
  3. Ignition OFF, connect a test lamp between the ignition circuit terminal 85 and the control circuit terminal 86.
  4. Ignition ON, verify that a test lamp illuminates ON and then OFF one time, between the ignition circuit terminal 85 and the control circuit terminal 86.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the SGCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the SGCM.
  5. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 30 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 B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground.
  6. Ignition OFF, disconnect the harness connector at the hill hold valve.
  7. Connect a test lamp between B+ and the control circuit terminal 2.
  8. Command the SGCM Brake Hold Solenoid 1 and Brake 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 ground. If the circuit tests normal, replace the SGCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the SGCM.
  9. Connect a test lamp between B+ and the control circuit terminal 4.
  10. Command the SGCM Brake Hold Solenoid 2 and Brake 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 ground. If the circuit tests normal, replace the SGCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the SGCM.
  11. If all circuits test normal, test or replace the hill hold brake delay valve.
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