C1216

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 All 1 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.

CONDITIONS FOR SETTING THE DTC
Diagnostic Trouble Code (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 Diagnostic Trouble Code (DTC) stores.
^ The ABS disables.
^ The ABS warning indicator(s) turns ON.

Note: DTC C1214 will also set with this DTC. If DTC C1214 is set as current DTC, follow the diagnostic table for this DTC first.

CONDITIONS FOR CLEARING THE DTC
^ The condition responsible for setting the Diagnostic Trouble Code (DTC) no longer exists and the Scan Tool Clear DTCs function is used.
^ 100 drive cycles pass with no DTCs 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 Diagnostic Trouble Codes (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 to the OFF position.

TEST DESCRIPTION
2. This test determines if the Electronic Brake Control Module (EBCM) is capable of controlling the electronic brake control relay as commanded.
4. This test determines if battery voltage is being supplied to the DEF fuse.
5. This test determines if battery voltage is being supplied to the Electronic Brake Control Relay.
6. This test ensures that there is continuity through the pull-in coil of the electronic brake control relay.
7. 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.
9. This test determines if the malfunction is due to the EBCM.

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Part 2 Of 2:

DTC C1216 BRAKE CONTROL RELAY COIL CIRCUIT OPEN