C1214

DTC C1214 Electronic Brake Control Relay Contact Circuit Open (Part 1 Of 3):

DTC C1214 Electronic Brake Control Relay Contact Circuit Open (Part 2 Of 3):

DTC C1214 Electronic Brake Control Relay Contact Circuit Open (Part 3 Of 3):

Electronic Brake Control Relay Schematic:

CIRCUIT DESCRIPTION
Ignition voltage is supplied through terminal C2 of the Electronic Brake Control Relay. The EBCM then is able to energize the pull-in coil by completing the ground circuit at connector C1 terminal of the EBCM. The magnetic field created closes the Electronic Brake Control Relay contacts and allows battery voltage and current through the Electronic Brake Control Relay terminal C1 to be supplied to the EBCM through connector C2, terminal C, which supplies power to the motors and solenoids.

CONDITIONS FOR SETTING THE DIAGNOSTIC TROUBLE CODE (DTC)
DTC C1214 can be set anytime after the EBCM commands the Electronic Brake Control Relay on (the Electronic Brake Control Relay is first commanded on during the three second bulb check). This test monitors the availability of current voltage to the motors and solenoids. This malfunction indicates voltage is not available and would therefore not allow ABS operation if required.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS is disabled and the amber ABS warning indicator is turned on. The red BRAKE warning indicator is turned on if the rear piston in the ABS brake motor pack is not in the home position.

DIAGNOSTIC AIDS
An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation. The frequency of the problem can be checked by using the enhanced diagnostic function of the scan tool, as described in Scan Tool Diagnostics in the scan tool manual. Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.

VIBRATION, TEMPERATURE EFFECTS
Check for vibration effects by performing the relay test function of the scan tool. 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. If the Electronic Brake Control Relay voltage changes significantly, replace the Electronic Brake Control Relay. If DTC C1214 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.

NOTE: J 39200 test leads must be zeroed prior to making any resistance measurements.