Table A ABS Indicator Lamp Always OFF, No DTCs

CIRCUIT DESCRIPTION
The Electronic Brake Control Module (EBCM) controls the operation of the amber ABS indicator lamp by means of a lamp driver relay.

The Amber ABS Indicator Lamp - is connected to the IG-COIL METER fuse through CKT 8B01. This circuit is hot in ON and START ignition switch positions.

When The Lamp Driver Relay - is in the OFF state (CKT 9U01 is open), the lamp driver relay grounds the amber ABS indicator lamp through CKT 6B01. This turns ON the amber ABS indicator lamp.

When The EBCM Commands OFF - the ABS indicator, the EBCM turns ON the lamp driver relay by grounding CKT 9U01. This causes the lamp driver relay to open the path to ground in CKT 6B01, turning OFF the amber ABS indicator lamp.

When The Ignition Switch Is Turned To The ON Position - the EBCM turns ON the ABS indicator for 3 seconds for a bulb check. Whenever a malfunction is detected within the ABS system, the EBCM tuns ON the ABS indicator, notifying the driver that ABS needs to be serviced.

If The EBCM Commands - the red BRAKE warning indicator ON due to an ABS malfunction that may degrade base braking operation and cannot do so, the ABS indicator will flash to indicate the serious nature of the problem.

DIAGNOSTIC AIDS
The following list contains items that need to be inspected when diagnosing this system:
^ Short to ground between the lamp driver relay and the amber ABS indicator lamp (CKT 6B01).
^ Open circuit or high resistance between the EBCM and the lamp driver relay (CKT 9U01).
^ Open coil or constantly closed contacts of the lamp driver relay.

Inspect The Following Harness Connectors - 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 before component replacement:
^ Lamp driver relay.
^ EBCM connector C1.
^ Instrument Panel (I/P) cluster C3.

Table A: ABS Warning Indicator On With No DTCs Set (Part 1 Of 2):

Table A: ABS Warning Indicator On With No DTCs Set (Part 2 Of 2):

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.

[2] Checks for a short to ground in the ABS indicator lamp circuit.
[3] Tests the EBCM ability to turn OFF the amber ABS indicator lamp.
[5] Checks control circuit to the lamp driver relay.
[6] Checks for power to the lamp driver relay and its coil for open.
[7] Checks power circuit to the lamp driver relay.
[8] Checks the integrity of the lamp driver relay control circuit.
[9] Checks resistance of the lamp driver relay coil for proper values.
[10] Checks the operation of the lamp driver relay.