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DTC C1215: Electronic Brake Control Relay Contact Circuit Always Active

WARNING: This page is about a different car, the 1997 Oldsmobile Cutlass and 1997 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  . After performing diagnostic system check, go to next step.
  2. If any other DTCs are set, go to appropriate DTC for diagnosis. If no other DTCs are set, go to next step.
  3. Turn ignition off. Install scan tool. Turn ignition on, with engine off. Using scan tool RELAY TEST function, command electronic brake control relay off. If scan tool indicates relay is off and battery voltage is equal to or less than 5 volts, go to step 12). If scan tool does not indicate relay is off and battery voltage is greater than 5 volts, go to next step.
  4. Turn ignition off. Disconnect EBCM/EBTCM connectors. Turn ignition on, with engine off. Using DVOM, measure voltage between switched battery input circuit (Red wire) of EBCM/EBTCM connector and ground. See WIRING DIAGRAM  . If voltage is equal to or less than 2 volts, go to step 6). If voltage is greater than 2 volts, go to next step.
  5. Turn ignition off. Remove electronic brake control relay. Turn ignition on, with engine off. Using DVOM, measure voltage between switched battery input circuit (Red wire) of EBCM/EBTCM connector and ground. See WIRING DIAGRAM  . If voltage is equal to or less than 2 volts, go to step 10). If voltage reading is greater than 2 volts, go to step 9).
  6. Turn ignition off. Check EBCM/EBTCM connector and wiring harness for poor terminal contact, corrosion or damage which could result in a short to voltage. If connectors are faulty, go to step 8). If connectors are okay, go to next step.
  7. Reconnect EBCM/EBTCM connectors. Turn ignition on, with engine off. Using scan tool RELAY TEST function, command electronic brake control relay off. If scan tool indicates relay is off and battery voltage is equal to or less than 5 volts, go to step 12). If scan tool does not indicate relay is off and battery voltage is greater than 5 volts, go to step 11).
  8. Replace all faulty terminals or connectors. After repairs, perform DIAGNOSTIC SYSTEM CHECK  .
  9. Repair short to voltage in switched battery input circuit (Red wire) between electronic brake control relay and EBCM/EBTCM. After repairs, perform DIAGNOSTIC SYSTEM CHECK  .
  10. Replace electronic brake control relay. After repairs, perform DIAGNOSTIC SYSTEM CHECK  .
  11. Replace EBCM/EBTCM. After repairs, perform DIAGNOSTIC SYSTEM CHECK  .
  12. Malfunction is not currently present. An intermittent may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside insulation. Frequency of malfunction can be determined by using enhanced diagnostic function of scan tool. Check for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wiring connections, or damaged wiring harness. After diagnosis is complete, clear DTCs and test drive vehicle for 3 drive cycles to verify DTC does not reset. Drive cycle consists of starting vehicle, driving vehicle faster than 10 MPH, stopping vehicle, and then turning ignition off.
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