C1214

Circuit Description
Ignition voltage is supplied to terminal 86 of the Electronic Brake Control Relay. The above condition enables the EBCM to energize the pull in coil by completing the ground circuit at connector terminal 2 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 C1 terminal B3. Connector C1 terminal B3 supplies power to the EBCM, which supplies power to the motors and solenoids.

Conditions for Setting the DTC
DTC C1214 can set anytime after the EBCM commands the Electronic Brake Control Relay ON. The command occurs during the three second bulb check.
DTC C1214 monitors the availability of current voltage to the motors and solenoids.
The above malfunction indicates voltage is not available. The malfunction will not allow ABS operation.

Action Taken When the DTC Sets
^ A malfunction DTC stores.
^ ABS is disabled.
^ The amber ABS warning indicator is turned ON.

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
The following conditions may cause an intermittent malfunction:
^ A poor connection
^ Rubbed-through wire insulation
^ A broken wire inside the insulation
Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction.
Thoroughly inspect any circuitry that may be causing the intermittent complaint for the following conditions:
^ Backed out terminals
^ Improper mating
^ Improperly formed or damaged terminals
^ Poor terminal-to-wiring connections
^ Physical damage to the wiring harness

Vibration and Temperature Effects
^ Use the following procedure in order to inspect for vibration effects by performing the Relay Test function of the Scan Tool:
1. With the Relay Test commanded on, lightly tap the top and sides of the Electronic Brake Control Relay while monitoring the Electronic Brake Control Relay voltage.
2. If the Electronic Brake Control Relay voltage changes significantly, replace the Electronic Brake Control Relay.
^ If DTC C121 4 only sets when the vehicle is initially started in cold ambient conditions (temperature less than 0°C (32°F)), replace the Electronic Brake Control Relay.

Test Description
3. This test checks to see if the EBCM is sensing battery voltage at terminal C.
4. This test checks for proper operation of the electronic brake control relay and related circuitry.
5. This test checks for excessive resistance in the switched battery input circuitry.
6. This test checks for excessive resistance in the battery feed circuit.
7. This test checks for excessive resistance in the ABS relay contacts.
8. This test determines if the malfunction is caused by poor terminal contact.
9. This test determines if the malfunction is caused by the EBCM.
10. This test checks for excessive resistance in the electronic brake control relay control circuitry.
11. This test checks for proper battery voltage.
12. This test checks for an open in the battery feed circuit.
13. This test checks for an open in the switched battery input circuit.
14. This test checks for excessive resistance in the electronic brake control relay coil.
15. This test checks for excessive resistance in the electronic brake control relay control circuit














DTC C1214 Brake Control Relay Contact Circuit Open