C1214

DTC C1214: ABS Relay Contact Circuit Open (Part 1 Of 2):

DTC C1214: ABS Relay Contact Circuit Open (Part 2 Of 2):

DTC C1214 Schematic:

Circuit Description
Ignition voltage is supplied to terminal 85 of the ABS relay. The Electronic Brake Control Module (EBCM) is then able to energize the pull-in coil by completing the ground circuit at EBCM terminal D6. The magnetic field created closes the ABS relay contacts and allows battery voltage and current to be supplied to the EBCM. In addition, the EBCM supplies power to the motors and ABS solenoids.

Conditions for Setting the DTC
This DTC will set when the following conditions are met:
^ Voltage in the switched battery input circuit to the EBCM falls below 7.05 volts (CKT 850).
^ This DTC can be set anytime.
Note: This DTC may take up to 2 seconds to set because it takes time for the ABS relay voltage to decay.

Action Taken When the DTC Sets
A malfunction DTC is stored, ABS is disabled, and the amber ABS indicator lamp is turned ON. The red BRAKE warning lamp is turned ON if the rear piston in the motor pack is not expected to be in the home position.

Conditions for Clearing the DTC
Conditions for the malfunction are no longer present and the Tech 2 scan tool Clear DTC Information DTCs function is used.
One hundred drive cycles have passed with no malfunctions detected.

Diagnostic Aids
The following list contains items that need to be inspected when diagnosing this system:
^ Open ABS fuse.
^ Faulty ABS relay (contacts open/high resistance).
^ Poor harness terminal contacts to the ABS relay (look for spread terminals).
^ Faulty electrical circuits (open or high resistance) between the ABS relay and the EBCM (CKT 850) and/or between the ABS fuse and the ABS relay (CKT 1446A/B).

An intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

The frequency of the malfunction is most likely checked by using the Enhanced Diagnostic function of the Tech 2 scan tool, as described in Enhanced Diagnostics.

Inspect the following harness connectors for backed out terminals, improper mating, broken lock, improperly formed or damaged terminals and for poor terminal-to-wire connection before component replacement:
^ ABS relay connector.
^ EBCM connectors C1 and C2.
If DTC C1214 only sets when the vehicle is initially started in cold ambient conditions (temperature less than 0�C [32�F]), replace the ABS relay.



Test Description
The numbers below refer to step numbers on the diagnostic table.
2. If ABS relay coil circuit is open, the ABS relay contacts will stay open. Therefore, follow DTC C1216 prior to diagnose this DTC.
4. Checks voltage input to the (CKT 850).
5. Checks ABS relay for open contacts when relay is turned ON.
6. Checks for open in CKT 1146A/B (power to the ABS relay).
7. Checks for an open in CKT 850.
8. Checks for short to ground in CKT 1446A/B
9. Checks for short to ground in CKT 850
10. Confirms if this DTC resets after 2 drive cycles.