A016

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
Ignition voltage is supplied through terminal "A2" of the ABS enable relay. The Electronic Brake Control Module (EBCM) then is able to energize the pull-in coil by completing the ground circuit at terminal "22" of the EBCM. The magnetic field created closes the 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 A016 can be set only after DTC A014 has been set. This test detects an open in the enable relay coil circuit. An open in this circuit will not allow the enable relay to be energized thus preventing voltage/current to the motors and solenoids. If this malfunction is present and the ignition is turned "OFF" before 5 km/h (3 mph) is reached, DTC A014 is set alone.

ACTION TAKEN
A malfunction DTC is stored, ABS is disabled and the ABS indicator lamp is turned "ON."

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step indicates the EBCM is capable of controlling the enable relay as commanded.
2. This step checks to insure that voltage is available to the pull-in coil of the enable relay.
3. This step insures that there is continuity through the pull-in coil of the enable relay.
4. This step verifies the integrity of the relay control circuit.
5. This step checks for a possible intermittent in the wiring or connectors.

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.

If the frequency of the malfunction is high, but is currently intermittent, check for high coil resistance by measuring between relay terminals "A1" and "A2" using a Digital Volt Meter (DVM). If resistance shows greater than 100 ohms, replace the relay.

Any circuitry, that is suspected as 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.