C1216

DTC C1216 Brake Control Rly Coil CKT Open 1 Of 4:

DTC C1216 Brake Control Rly Coil CKT Open 2 Of 4:

DTC C1216 Brake Control Rly Coil CKT Open 3 Of 4:

DTC C1216 Brake Control Rly Coil CKT Open 4 Of 4:

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

CONDITIONS FOR SETTING THE DTC
DTC 1216 can set anytime after the Electronic Brake Control Relay is commanded ON. This test detects an open in the Electronic Brake Control Relay cold circuit. An open in this circuit will not allow the Electronic Brake Control Relay to be energized thus preventing power to the motors and solenoids.

A DTC C1286 will be set with DTC C1216 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(s) 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 switch to the OFF position.

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.

If the frequency of the malfunction is high, but is currently intermittent, inspect for high coil resistance. Use a J 39200 in order to measure for high coil resistance by measuring between Electronic Brake Control Relay terminal 85 and terminal 86. If the resistance shows greater than 95 ohms, replace the Electronic Brake Control Relay.

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

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.