C1216

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 1216 can set anytime after the Electronic Brake Control Relay is commanded ON.
This test detects an open in the Electronic Brake Control Relay coil 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 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 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.
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.

Test Description
2. This test determines if the EBCM is capable of controlling the electronic brake control relay as commanded.
3. This test checks for voltage at the electronic brake control relay pull-in coil.
4. This test checks for an open or high resistance in the electronic brake control relay pull-in coil.
5. This test checks for an open or high resistance in the electronic brake control relay control circuit between the electronic brake control relay and the EBCM.
7. This test determines if the malfunction is caused by the EBCM.
8. This test checks for battery voltage at the underhood junction block.
10. This test checks for a short to ground in the ignition feed circuit to the EBCM.
11. This test checks for an open or high resistance in the underhood junction block between the ABS IGN fuse and the electronic brake control relay.











DTC C1216 Brake Control Relay Coil Circuit Open