C1215

Circuit Description
Ignition voltage is supplied to terminal 86 of the Electronic Brake Control Relay. The above condition enables the EBCM to energize the pulling coil by completing the ground circuit at connector terminal A11 of the EBCM. The magnetic field created closes the Electronic Brake Control Relay contacts. The magnetic field also allows battery voltage and current through the Electronic Brake Control Relay terminal 30 to be supplied to the EBCM through connector terminal C. Connector terminal C supplies power to the EBCM, which supplies power to the motors.

Conditions for Setting the DTC
- DTC C1215 can set only before the EBCM commands the Electronic Brake Control Relay ON.
- DTC C1215 determines if the Electronic Brake Control Relay energizes when the Electronic Brake Control Relay should not energize. The above malfunction will not allow the Electronic Brake Control Relay to remove power to the ABS system.
- If a second malfunction occurs, that requires the Electronic Brake Control Relay to turn OFF, the second malfunction cannot be removed if the Electronic Brake Control Relay cannot be controlled. The DTC sets if the malfunction is present for three consecutive drive cycles.

Action Taken When the DTC Sets
- A malfunction DTC stores.
- The ABS does not disable.

Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
- 100 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition OFF.

Diagnostic Aids
A sticking or malfunctioning relay may cause an intermittent malfunction. Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Clear the DTCs after completing the diagnosis. Test drive the vehicle for three drive cycles in order to verify that the DTC does not reset. Use the following procedure in order to complete one drive cycle:
1. Start the vehicle.
2. Drive the vehicle over 16 km/h (10 mph).
3. Stop the vehicle.
4. Turn the ignition to the OFF position.

Test Description
3. This test determines if the EBCM is capable of controlling the electronic brake control relay as commanded.
4. This test checks for voltage at terminal C of the EBCM harness connector. If voltage is present, the malfunction exists in the electronic brake control relay and/or its circuitry.
5. This test checks for a short to battery voltage in the switched battery input circuit.
7. This test ensures that the malfunction is not due to a short to battery voltage in the switched battery input circuit with the EBCM connected.