A014

DTC A014 ABS Enable Relay Contact Circuit Open (Part 1 Of 5):

DTC A014 ABS Enable Relay Contact Circuit Open (Part 2 Of 5):

DTC 14 ABS Enable Relay Contact Circuit Open (Part 3 Of 5):

DTC A014 ABS Enable Relay Contact Circuit Open (Part 4 Of 5):

DTC A014 ABS Enable Relay Contact Circuit Open (Part 5 Of 5):

ABS Enable Relay & Circuit:

Circuit Description:
Ignition voltage is supplied through terminal "1" of the ABS enable relay. The EBCM then is able to energize the pull-in coil by completing the ground circuit at pin "22" of the EBCM. The magnetic field created closes the ABS enable relay contacts and allows battery voltage and current to be supplied to the EBCM, which supplies power to the motors and solenoids.

Failure Condition:
DTC A014 can be set anytime after the EBCM commands the ABS enable relay "ON" the relay is first commanded "ON" during initialization). This test monitors the availability of current/voltage to the monitors and solenoids. This malfunction indicates voltage is not available and would therefore not allow ABS operation if required.

Action Taken:
A DTC A014 is stored, ABS is disabled and the "ABS" indicator is turned on or will flash. If the rear piston is not in the home position, the red "BRAKE" indicator will also be illuminated.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step checks to see if the EBCM is sensing battery voltage at C2, terminal "1".
2. This step checks for proper operation of the ABS enable relay and related circuitry.
3. This step checks for excessive resistance in the switched battery input circuitry.
4. This step checks for excessive resistance in the B+ feed circuit.
5. This step determines if the malfunction is due to a poor connection.
6. This step determines if the malfunction is due to the EBCM.
7. This step checks for excessive resistance in the ABS enable relay control circuitry.
8. This step checks for proper battery voltage.
9. This step checks for an open in the B+ feed circuit.
10. This step checks for an open in the switched battery input circuit.
11. This step checks for proper operation of the ABS enable relay.
12. This step checks for excessive resistance in the ignition switch "ON" feed (CIG & RADIO fuse) circuit.
13. This step checks for excessive resistance in the ABS enable relay coil.
14. This step checks for excessive resistance in the ABS enable relay control circuit between the relay and the EBCM.
15. This step checks for excessive resistance in the ABS enable relay control circuit between the relay and C206.

Diagnostic Aids:
An "Intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation or a wire that is broken inside the insulation.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the TECH 1.

Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.

VIBRATION, TEMPERATURE EFFECTS:
Check for vibration effects by performing the relay test function of the TECH 1. With the relay commanded "ON," lightly tap the top and sides of the relay while monitoring relay voltage. If the relay voltage changes significantly, replace the relay.

If DTC A014 only occurs when the vehicle is initially started in cold ambient conditions (temperature less than 0°C- 32°F), replace the relay.