C1217

DTC C1217 Electronic Brake Control Relay Coil Circuit Shorted To Ground (Part 1 Of 2):

DTC C1217 Electronic Brake Control Relay Coil Circuit Shorted To Ground (Part 2 Of 2):

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 C1217 can be set before the EBCM commands the Electronic Brake Control Relay on. This test determines if the Electronic Brake Control Relay is energized when it should not be. This malfunction would not allow the Electronic Brake Control Relay to remove power to the ABS system. If a second malfunction were to occur that requires the Electronic Brake Control Relay to be turned off, the malfunction cannot be removed if the Electronic Brake Control Relay cannot be controlled.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored. ABS is not disabled.

DIAGNOSTIC AIDS
An intermittent malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation. The frequency of the malfunction 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.

NOTE: J 39200 test leads must be zeroed prior to making any resistance measurements. Refer to J 39200 user's manual.

After diagnosis is complete, clear the DTC's and test drive the vehicle for three (3) drive cycles to verify that the DTC does not reset. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping the vehicle and then turning the ignition to the OFF position.