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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 488 (Trailer Brake Control System) >> Diagnostic Information and Procedures >> DTC C0870, C1112, C1113, C1114, or C1119 (Gasoline Without LY6) >> Circuit/System Testing

Circuit/System Testing

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NOTE:

These diagnostics are based on not having a trailer connected.

  1. Ignition ON, verify that DTC P2534 is not set.
  2. Ignition OFF, disconnect the harness connector at the trailer brake control relay.
  3. Test for less than 5 Ω between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal F 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 STUD 2 fuse is open, replace the trailer brake control relay.
  5. Test for 8.5 - 10.5 V between control circuit terminal E and ground.
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the fuel pump/trailer brake control module.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the fuel pump/trailer brake control module.
  6. Test for 3.2 - 4.1 V between the control circuit terminal C and ground.
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the fuel pump/trailer brake control module.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the fuel pump/trailer brake control module.
  7. Test for 3.2 - 4.1 V between the control circuit terminal A and ground.
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the fuel pump/trailer brake control module.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the fuel pump/trailer brake control module.
  8. Test for less than 1 V between the control circuit terminal D and ground.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the fuel pump/trailer brake control module.
  9. Ignition OFF, disconnect the harness connector at the fuel pump/trailer brake control module.
  10. Test for infinite resistance between the signal circuit terminal D and ground.
    • If not the specified value, test the signal circuit for a short to ground.
  11. Test for less than 2 Ω between signal circuit terminal 9 and terminal D of the trailer brake control relay harness connector.
    • If greater than the specified range, test the signal circuit for an open/high resistance.
  12. If all circuits test normal, replace the trailer brake control relay.
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