C1218

DTC C1218 Brake Control Rly Coil CKT Short To V:

DTC C1218 Brake Control Rly Coil CKT Short To V 1 Of 2:

DTC C1218 Brake Control Rly Coil CKT Short To V 2 Of 2:

CIRCUIT DESCRIPTION
Ignition voltage is supplied to terminal 86 of the Electronic Brake Control Relay. The above enables the Electronic Brake Control Module (EBCM) to energize the puffin 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 terminal C. Connector terminal C supplies power to the EBCM, which supplies power to the motors and solenoids.

CONDITIONS FOR SETTING THE DTC
DTC C1218 can set after the EBCM commands the Electronic Brake Control Relay on.

This test monitors the availability of voltage to the EBCM.

DTC C1286 is set with DTC C1218 if the rear channel is not expected to be in the home position.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction Diagnostic Trouble Code (DTC) stores.
^ The ABS disables.
^ The ABS warning indicator turns 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 DTC(s) 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
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 switch to the OFF position.

Important: Zero the J 39200 test leads before making any resistance measurements. Refer to the J 39200 user's manual.